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A Device For Measurement Of Electrical Properties Of Electro Conductive Fabrics

Abstract: The various embodiments of the present invention provide an electro-conductive testing device for measuring electrical properties of electro-conductive fabrics, the device comprising an electrode assembly a temperature sensor, at least one or more measurement platform, at least one or more tray to hold the chemical compositions, at least one or more heating elements, at least one or more regulated air producing element such as fan, a control panel, a regulated direct current power supply means and a computing device connected to the components of the device for measuring electrical properties of electro-conductive fabrics to automate the process wherein the test samples of the electro conductive fabrics whose electrical characteristics are to be measured are placed on the measurement platform and moved along the x-axis and y-axis directions randomly and further the electrode assembly which is attached to a pressure applying and controlling unit imparts a predefined pressure onto the fabric test sample thereby allowing the measurement of the electrical properties of electro-conductive fabric samples.

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Notices, Deadlines & Correspondence

Patent Information

Application #
Filing Date
24 June 2015
Publication Number
54/2016
Publication Type
INA
Invention Field
PHYSICS
Status
Email
Parent Application
Patent Number
Legal Status
Grant Date
2024-05-31
Renewal Date

Applicants

INDIAN INSTITUTE OF TECHNOLOGY
HAUZ KHAS, NEW DELHI-110016

Inventors

1. SEN,KUSHAL PROF
DEPARTMENT OF TEXTILE TECHNOLOGY, INDIAN INSTITUTE OF TECHNOLOGY DELHI, HAUS KHAS, NEW DELHI-110016
2. DAS, DIPAYAN DR.
DEPARTMENT OF TEXTILE TECHNOLOGY, INDIAN INSTITUTE OF TECHNOLOGY DELHI, HAUS KHAS, NEW DELHI-110016
3. MAITI, SYAMAL
RESEARCH SCHOLAR, DEPARTMENT OF TEXTILE TECHNOLOGY, INDIAN INSTITUTE OF TECHNOLOGY DELHI, HAUS KHAS, NEW DELHI-110016

Specification

TECHNICAL FIELD The present invention generally relates to a device and method for measurement of electrical properties of electro-conductive fabrics. The present invention more particularly relates to an all-in-one device for measuring electrical properties of electro-conductive fabrics under varied test conditions. Further, the present invention also relates to automatic measurement of electrical properties at different places of the fabric, without any human interference. B) BACKGROUND OF THE INVENTION The electro-conductive textiles may find applications in the areas of electromagnetic shielding, gas sensing, electrostatic dissipation, particle filtration, dust and germ free clothing, data transfer in clothing, military applications such as camouflage and stealth technology, etc. The electrical conductivity or resistivity is one of the key properties of such products. However, the measurement of electrical conductivity or resistivity of textile products is very complex. As known, the textile products are flexible and compressible and they possess non-uniform surface, making the measurements very difficult. Such measurements are therefore quite challenging. A few attempts were made in the past to measure the electrical properties of electroconductive fabrics. Bera et al. (2014) reported a method for measurement of electrical impedance of fabrics by spectroscopy analysis. The device used by them measured the impedance (not resistance or resistivity) of the fabrics. As mentioned in the article, the authors of this work applied different weights (by hands) onto the fabrics and measured their impedances for determination of compression-induced impedance of the fabrics. Clearly, a significant amount of human interference was involved in the measurements. Further, it goes beyond saying that these measurements should be automated and the tests area should be selected randomly, preferably without any human interference. However, there is no such equipment or device which is commercially available today. Rebouillat and Lyons (2011) reported a method for measurement of conductivity of single electro-conductive fiber, but no equipment or device was reported for measuring electrical properties of electro-conductive fabrics under varied test conditions. Further, the measurement of surface resistivity, which is generally carried out by using a ring-disc type two probe electrode system in accordance with ASTM D257 standard, is often questionable. During this measurement, an arbitrarily chosen pressure is applied onto the fabrics to achieve proper contact between the fabrics and the electrodes. The pressure remains same for all kinds of fabrics. Nevertheless, the fabrics made up of different fibers and having different constructions are expected to exhibit different degrees of contact under the application of varying pressure, r t P i . ^ i f h ' ^i4urrE>w?0-uldj ghfv^differpnt levlls of electro-conductivity. It is therefore 2 necessary to exert an appropriate amount of pressure onto a given fabric. This pressure may be different for different fabrics, depending on the nature of the constituent fibres used and the characteristics of the technologies employed to produce such fabrics. In view of the foregoing, there is a need to provide a device or equipment which would incorporate necessary modules for measurement of electrical properties of electro-conductive fabrics under optimum pressure for making fair comparisons among the fabrics. The above mentioned shortcomings, disadvantages and problems are addressed herein, which will be understood by reading the following specification. C) OBJECTIVES OF THE INVENTION The primary objective of the present invention is to provide a device or equipment for automatic measurement of electrical properties of electro-conductive fabrics according to an embodiment of the present invention. Another objective of the present invention is to provide a device or equipment to measure the surface as well as volume resistivity of the conductive fabrics under different conditions such as relative humidity, temperature, time duration, and pressure applied onto the fabrics according to an embodiment of the present invention. It is yet another objective of the present invention to provide a device or equipment to measure the electrical properties of electro-conductive fabrics without any human intervention process according to an embodiment of the present invention. These and other objectives and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. D) SUMMARY OF THE INVENTION The various embodiments of the present invention provide a device for measuring electrical properties of electro-conductive fabrics, the device comprising an electrode assembly, a temperature sensor, at least one or more measurement platform, at least one or more tray to hold different chemicals or hygroscopic agents, at least one or more heating elements, at least one or more regulated air producing element such as fan, a control panel, a regulated direct current power supply means and a computing device connected to the components of the device for measuring electrical properties of an electro-conductive fabric to automate the process; wherein, the test samples of the electro conductive fabric whose electrical characteristics are to be measured are placed on the measurement platform and moved along the x-axis and y-axis directions randomly and further the electrode assembly which is attached to a pressure applying and controlling unit imparts a predefined pressure onto the fabric test sample, thereby allowing the measurement of the electrical properties of an 3 1 electro-conductive fabric sample. According to an embodiment of the present invention, the electrode assembly is a servo motor controlled assembly that has been mounted outside the fabric sample testing chamber and is controlled by a microprocessor. The pressure at the contact point between the electrode of the electrode assembly and the fabric to be tested is a customized value and it is provided through the control panel or through the computing device as an input to the test fabric. The customized value determines the amount of pressure to be put over the fabric, decides the test area randomly and governs the amount of electricity to be passed through the test fabric to determine the electrical properties of fabric sample. Further, the electrode assembly employed herein for the measurement of electrical properties of electro-conductive fabrics is of at least a concentric ring-disc electrode configuration. According to an embodiment of the present invention, the measurement platform is divided into at least four quadrants for the measurement of surface resistivity, volume resistivity and voltage-temperature characteristics. The first two quadrants are used to measure surface resistivity, the third quadrant is used to measure the volume resistivity and the fourth quadrant is used to measure the voltage-temperature characteristics of the electro-conductive fabrics under test. Further, the voltagecurrent characteristics of the electro-conductive fabrics are measured in the first and the second quadrants of the measurement platform and the measurement platform is an x-axis and y-axis movable platform which allows the electrode to select a random test point on the electro-conductive fabrics. According to an embodiment of the present invention, a temperature sensor is at least an infrared sensor mounted inside the test chamber which provides constant data to the computing system or to the control system with the information relating to the change in temperature of the electro conductive fabric kept inside the test chamber and the test chamber comprises of one or more trays to hold different chemicals or hygroscopic agents in order to control the relative humidity within the test chamber. According to an embodiment of the present invention, one or more heating elements are mounted inside the test chamber to control the temperature inside the test chamber and at least one or more regulated air producing elements such as fan are mounted inside the test chamber to circulate the air and maintain the uniform climate inside the chamber. According to an embodiment of the present invention, the control panel receives the input settings and provides it to the inbuilt microprocessor such that the microprocessor regulates the use of air producing elements such as fan and the heating elements for maintaining a uniform temperature and humidity atmosphere within the test chamber and the power supply system also comprises of current and .vpJ|age>n^asU:j;igg_deyiG|es and tlpejpowgrsfupply system provides the required power 4 distribution to the test chamber and its associated components to measure the characteristics of the electro-conductive fabrics. According to an embodiment of the present invention, the power supply system was controlled by software installed in the computing system such that it was possible to define the voltage range applied onto the test fabric and the current flowing through was measured and recorded automatically and the computing device was configurable to receive inputs from a remote location on a computer network through another computing device on another computer network and provided those inputs to the device for measuring electrical properties of electro-conductive fabrics and performed the required test based on the received input test data over the test fabric and transmitted back the changes or test outcomes recorded in the test chamber with the test results to the remote location. Further, the computing device can be configured to record the voltage-current and voltage-temperature profiles at random locations on the electro-conductive fabrics kept in the test chamber. According to an embodiment of the present invention, the computing device can be configurable to integrate an image capturing and live video relay device such as a web-camera to remotely monitor the condition of the fabric under test in the test chamber. Further, a resistance measuring system can be configured to record the change in resistance, if any, over a period time under voltages applied to the test fabric. These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications. BRIEF DESCRIPTION OF THE DRAWINGS The other objects, features and advantages will occur to those skilled in the craft from the following description of the preferred embodiment and the accompanying drawings in which: FIG.1 depicts the components of the device for measuring electrical properties of the electro-conductive fabrics according to an embodiment of the present invention. FIG. 2 depicts the device and its other related parts of the device used for measuring electrical properties of the electro-conductive fabrics according to an embodiment of the present invention. FIG. 3 depicts the graph data depicting the plot of effect of test duration on electrical resistance according to an embodiment of the present invention. 5 FIG. 4 depicts the graph data depicting the plot of effect of electrode pressure on electrical resistance according to an embodiment of the present invention. FIG. 5 depicts the graph data depicting the plot of effect of temperature on electrical resistance of electro-conductive fabric according to an embodiment of the present invention. FIG. 6 depicts the graph data depicting the plot of effect of voltage on current flow of electro-conductive fabric according to an embodiment of the present invention. FIG. 7 depicts the graph data depicting the plot of effect of voltage on temperature of electro-conductive fabric according to an embodiment of the present invention. Although specific features of the present invention are shown in some drawings and not in others. This is done for convenience only as each feature may be combined with any or all of the other features in accordance with the present invention. F) DETAILED DESCRIPTION OF THE INVENTION In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the craft to practice the embodiments and it is to be understood that the logical, mechanical and other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense. The various embodiments of the present invention provide an electro-conductive testing device for measuring electrical properties of electro-conductive fabrics, the device comprising an electrode assembly a temperature sensor, at least one or more measurement platform, at least one or more tray to hold the chemicals or hygroscopic agents, at least one or more heating elements, at least one or more regulated air producing elements such as fan, a control panel, a regulated direct current power supply system and a computing device connected to the components of the device for measuring electrical properties of an electro-conductive fabrics to automate the process; wherein, the test samples of the electro conductive fabrics whose electrical characteristics are to be measured are placed on the measurement platform and moved along the x-axis and y-axis directions randomly and further the electrode assembly which is attached to a pressure applying and controlling unit imparts a predefined pressure onto the fabric test sample thereby allowing the measurement of the electrical properties of an electro-conductive fabric sample. The electro-conductive testing device for measuring electrical properties of an electro-conductive fabrics described in the present invention is an all-in-one device for measuring a set of electrical properties of electro-conductive fabrics under varied test conditions. The electro-conductive testing device measures the surface resistivity as well as the volume resistivity of the conductive fabrics under different or varied conditions such as relative humidity, temperature, time duration, and pressure =.*- . .appliecLonto taeJabrics=«The-ele©tr-e-GOBdactive testing device can also be configured 6 to determine the voltage-current and voltage-temperature characteristics of the electro-conductive fabrics. The measurements can be performed automatically on different places of the fabric randomly without any human interference. As the measurement system is interfaced to a computing system it is possible to obtain and analyze the measured data stored in these computing devices. The recorded data by the computing systems can also be accessed remotely with the help of internet connection and a web camera integrated into the electro-conductive testing device. According to the embodiment, the components of the electro-conductive testing device were assembled in the top chamber. These components basically comprised but were not limited to a measurement platform which was capable of performing xaxis and y-axis movements as governed by random selection of the coordinates of the test area, an electrode assembly with pressure control for selecting and determining the optimum pressure, a surface temperature measuring device for monitoring any change of temperature, a power supply and current and voltage measuring devices and a environment control system for maintaining uniform temperature and humidity within the chamber. The control panel, the video camera and the computing device were placed outside the chamber due to the reason such as high humidity and power risk factors. The main platform had four quadrants, namely for measurement of surface resistivity, volume resistivity and voltage-temperature characteristics. The voltage-current characteristics could be measured in the first two quadrants. Further, the electrode assembly used herein is of concentric ring-disc electrode configuration and the test area within the three quadrants was randomly selected once the numbers of readings were defined, and the data were recorded. The electrode assembly was attached to a pressure applying and controlling unit which could impart a predefined pressure onto the fabric test samples. This essentially was a servo motor controlled assembly that was mounted outside the test chamber as the microprocessor controls were expected to be affected from the humidity inside the chamber. The heating system was integrated to control the temperature inside the chamber. The fan was used to circulate the air and maintain the uniform climate inside the chamber and a pair of trays was used to keep saturated solutions of different chemicals or hygroscopic agents in order to control the relative humidity within the chamber. To measure the surface temperature of the fabric sample an infra-red sensor was fixed inside the test chamber. The infra-red sensor was used to measure the changes in temperature of the test sample as a result of current flowing through it. The resistance measuring system was connected to the computer and could also record the change in resistance, if any, over a period time under applied voltage. The power supply unit was controlled by software such that it was possible to define the voltage range applied onto the fabric and the current flowing through was measured and HIE' 2' 4- - 0-S*- Z S I 5- i 7 * S 5- 7 recorded automatically. The mechanical, electrical and electronic parts of the instrument were capable of withstanding temperature (0°C - 50°C) and relative humidity (1 % - 99 %). The electro-conductive fabrics were secured tightly on the platform by insulated clamps according to the test intended. The specimen size was kept at 10 cm * 10 cm for all the tests and the pressure of contact between the electrode and the fabric was fixed as desired. The measuring conditions were set in to the computing device prior to testing. Further, the electro-conductive testing device could measure electrical resistivity, ranging from a few uhms to several mega-bhms, of fabrics under different conditions such as relative humidity, temperature, for different time durations, and applied electrode pressure. It is also possible to record the voltage-current and voltagetemperature profiles of the electro-conductive fabrics. The measurements could also be performed automatically at random places, without any human interference. The measurement system was interfaced to a computing device and thus it was possible to obtain and analyze the measured data stored in the computer. This further could also be accessed remotely via internet connection remotely. The movement of the stage (platform) could also be seen at the remote location by interfacing the web camera with the electro-conductive testing device. FIG.1 depicts the components of the device for measuring electrical properties of the electro-conductive fabrics according to an embodiment of the present invention. According to the embodiment, the device or the equipment for measurement of resistivity of the fabric samples comprised a complete machine (a) connected to a software display (b) system and has a measuring platform (c) for providing the base to receive the fabric to be tested. The electro-conductive fabrics were secured tightly on the measuring platform by insulated clamps according to the test intended and the specimen size was kept at 10 cm x 10 cm for all the tests. Further, the pressure of contact between the electrode and the fabric was fixed as desired by providing certain inputs to the software display system (b) present on the computing system. These measuring conditions were set in to the computing device prior to testing. FIG. 2 depicts the device and its other related parts of the device used for measuring electrical properties of the electro-conductive fabrics according to an embodiment of the present invention device for measuring electrical properties or the resistivity of the electro-conductive fabrics comprises of an electrode assembly 1, a temperature sensor, a measurement platform 3 in which there exits 4 quadrants, The first quadrant was used for a resistivity measurement without conducting bottom plate 3a. Further, the second quadrant resistivity measurement with conducting bottom plate was 3b. The voltage-temperature characteristic measurement 3c was the third quadrant and volume resistivity measurement 3d was in the fourth quadrant. The test chamber basically comprised of one or more trays ray for placing chemicals 4. These «, _ _ . chemicals-or the-hygroscQpi& agents wejerfjsed to control the relative humidity within 8 the chamber. The Heating element 5 was integrated to control the temperature inside the test chamber. A Fan 6 was used to circulate the air and maintain the uniform climate inside the chamber. The Control panel 7 was basically a environment control system for maintaining uniform temperature and humidity within the chamber. The control panel 7 basically received input from the user or from the computer to activate or deactivate certain actions pertaining to the test chamber. The regulated DC power supplies 8 provided the relevant power requirements for the device to power up and operate. The computing system 9 was basically used as an interface to receive user inputs and provide these inputs to the test chamber. Further the computing device is configured to receive one more output data from the test chamber and store it for further analysis. It has to be noted that by integrating a web camera or similar such device tn the electro-conductive testing device it was possible to monitor the test fabric remotely and read the data values remotely. FIG. 3 depicts the graph data depicting the plot of effect of test duration on electrical resistance according to an embodiment of the present invention. According to the embodiment, it can be observed that the electrical resistance of the fabrics was almost constant, irrespective of their level of resistance. The readings therefore, can be recorded as soon as one wishes, may be at 30 s after the start of the test for these samples as there is inertial period. This test can give us the idea whether the sample is stable in this respect FIG. 4 depicts the graph data depicting the plot of effect of electrode pressure on electrical resistance according to an embodiment of the present invention. According to the embodiment, a set of two electro-conductive fabrics were chosen and their electrical resistance was measured at different levels of compression and the results are depicted here. It can be observed that both Fabric A and Fabric B showed a decrease in electrical resistance before leveling off. Interestingly, Fabric A showed almost no change in electrical resistance beyond the compressive pressure of 25 kPa, while Fabric B showed no change in electrical resistance beyond the compressive pressure of 40 kPa. If these two fabrics were required to be compared for their electrical resistance then the measurements of electrical resistance should be conducted at a compressive pressure of 25 kPa or higher in the case of Fabric A and 40 kPa or higher in the case of Fabric B. It was therefore concluded that the optimum load for measuring surface resistance for different fabrics would be different and so the measurements should only be done at this pressure. This could be easily done with the designed equipment. Moreover, it is suggested that the testing standards for the measurements of resistivity should be modified accordingly. FIG. 5 depicts the graph data depicting the plot of effect of temperature on electrical resistance of electro-conductive fabric according to an embodiment of the present invention. According to the embodiment, the device to the machine is also capable of measuring various characteristics of electro-conductive fabric like temperatureresistivity and is depticted in this graph. HP ©• O-E L. H 3E. 2,4 - u-S- - 2.02 S | ? ^55. 9 FIG. 6 depicts the graph data depicting the plot of effect of voltage on current flow of electro-conductive fabric according to an embodiment of the present invention. . According to the embodiment, the device to the machine is also capable of measuring various characteristics of electro-conductive fabric likevoltage-current levels and is depticted in this graph. FIG. 7 depicts the graph data depicting the plot of effect of voltage on temperature of electro-conductive fabric according to an embodiment of the present invention. According to the embodiment, the device to the machine is also capable of measuring various characteristics of electro-conductive fabric likevoltage-temperature levels and is depticted in this graph. EXAMPLES: The following examples are given by way of illustrating the present invention and should not be construed to limit the scope of the invention. Results and equipment capability analysis The measurement reliability of this equipment was estimated in terms of repeatability and reproducibility for determination of surface resistivity of electro-conductive fabric. In this study, a set of ten samples electro-conductive fabric samples (prepared by combination of chemical and electrochemical in situ polymerization) was randomly chosen and five measurements were performed on each sample by each of three different operators chosen. The results of measurements were analysed separately by two statistical techniques, namely tabular method and analysis of variance. The gage variability, product variability and total variability of the measurement system were determined. The ratio of gage-to-product variability, which is an indicative of the measurement capability of the equipment, was also determined. Experimental data The results of the above experiments are shown in Table 1. Here xvx2,x3 denote the average resistance of fabrics as obtained by operators I, II and III, respectively. Rl,R2,R3indicate the range of fabric resistance as obtained by operators I, II and III, respectively. xj,x2,x3 represent the grand average resistance of fabrics as obtained by operators I, II, and III, respectively. Rt,R2,R3 refer to the average of ranges of fabric resistance as obtained by operators I, II, and III, respectively. a) Measurements of electrical surface resistance of fabrics obtained by operator I Sample 1 1 4.94 2 4.8 Electrical resistance (Q) 3 4.84 4 4.69 5 4.76 *4.81 * , 0.25 ELItl Z4-B&-2M1S 17-b-fe 10 Tabular method of system capability analysis Estimation of gage repeatability It is known that the gage repeatability assesses whether the same operator can measure the same sample multiple times with the same instrument and get the same value. In fact, the gage repeatability is an index that characterizes the capability of measurement equipment for obtaining the same results under repeated measurements. The gage repeatability (6repealabililv) is estimated as follows repeatability j \ ' / a2 where R indicates the average of the three average ranges R]t R2, R3 and d2 is a statistical constant. The value of d2 can be obtained for sample of size five (number of measurements performed on each sample by each operator) from the table required for obtaining constants for the statistical control charts. In this work, the numerical value of ^obtained was obtained as follows ^ = - ( ^ , + ^ 2 + ^ 3 ) = -(0.54 + 0.41 + 0.44) = 0.463 (2) The estimate of gage repeatability was then calculated as follows _R _ 0-463 ^repeatability ~ , ~ j , ~ ^ — V-*-"™ (3) where d2 for sample of size five was taken as 2.326. Estimation of gage reproducibility As known, the gage reproducibility assesses whether different operators after measuring a parameter of the same sample on the same instrument can get the same value. Essentially, the gage reproducibility indicates the variability that arises because of the differences among the operators taking the measurements. If the measured values differ, the reason is due to the biasness of the operators, since all three operators measure the same sample by using the same instrument. The estimate of gage reproducibility is expressed as follows 12 .1 reproducibility j (4) where orepmducmHy denotes the gage reproducibility and R= indicates the grand range. This is expressed as follows R* = x„„„ - x, max mm (5) Where, xmax and xmln denote the maximum and minimum of x,.x2,x3. Note thatx,,x2and x3 represent the individual measurements taken by operator I, operator II and operator III, respectively, xis the average of measurement data for each sample, xdenotes the grand mean of all measurements for all the samples. In this case, the two quantities xmax and xmjn were calculated as follows x^ = max (x,, x2, x^ ) = 5.43 (6) %mn = min (f,, f2, %) = 5.26 " (7) The grand range was then calculated as follows ^ = ^ « - ^ , » = 0 - 1 7 (8) The estimate of gage repeatability was obtained as follows p f)17 reproducibility j •< s-(\'> \&) where d2 for sample of size three was taken as 1.693. Estimation of gage variability The gage variability includes both gage repeatability and gage reproducibility. The gage variability is expressed as follows 2 2 2 gage repeatability reproducibility (''-'/ In this work, the gage variability was calculated as stated hereunder °laSe=<7lPea,abi,i»+Reproducibility = { 0 - ^ (11) Hence, crgage= 0.223 (12) Estimation of ratio of gage variability to product variability The estimate of the standard deviation of total variability, including both product variability and gage variability, can be obtained as o]otal = S2 where S denotes the standard deviation of data. As we know that

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1 1874-DEL-2015-EDUCATIONAL INSTITUTION(S) [25-09-2024(online)].pdf 2024-09-25
1 1874-del-2015-Form-5-(24-06-2015).pdf 2015-06-24
2 1874-del-2015-Form-3-(24-06-2015).pdf 2015-06-24
2 1874-DEL-2015-EVIDENCE FOR REGISTRATION UNDER SSI [25-09-2024(online)].pdf 2024-09-25
3 1874-DEL-2015-IntimationOfGrant31-05-2024.pdf 2024-05-31
3 1874-del-2015-Form-2-(24-06-2015).pdf 2015-06-24
4 1874-DEL-2015-PatentCertificate31-05-2024.pdf 2024-05-31
4 1874-del-2015-Form-1-(24-06-2015).pdf 2015-06-24
5 1874-del-2015-GPA-(13-10-2015).pdf 2015-10-13
5 1874-DEL-2015-FORM-8 [29-03-2024(online)].pdf 2024-03-29
6 1874-DEL-2015-Written submissions and relevant documents [28-03-2024(online)].pdf 2024-03-28
6 1874-del-2015-Form-1-(13-10-2015).pdf 2015-10-13
7 1874-DEL-2015-Correspondence to notify the Controller [19-02-2024(online)].pdf 2024-02-19
7 1874-del-2015-Correspondence Others-(13-10-2015).pdf 2015-10-13
8 1874-DEL-2015-US(14)-HearingNotice-(HearingDate-13-03-2024).pdf 2024-02-14
8 1874-DEL-2015-FORM 18 [25-04-2019(online)].pdf 2019-04-25
9 1874-DEL-2015-FER.pdf 2021-10-17
9 1874-DEL-2015-ABSTRACT [11-04-2022(online)].pdf 2022-04-11
10 1874-DEL-2015-CLAIMS [11-04-2022(online)].pdf 2022-04-11
10 1874-DEL-2015-FER_SER_REPLY [11-04-2022(online)].pdf 2022-04-11
11 1874-DEL-2015-COMPLETE SPECIFICATION [11-04-2022(online)].pdf 2022-04-11
11 1874-DEL-2015-DRAWING [11-04-2022(online)].pdf 2022-04-11
12 1874-DEL-2015-COMPLETE SPECIFICATION [11-04-2022(online)].pdf 2022-04-11
12 1874-DEL-2015-DRAWING [11-04-2022(online)].pdf 2022-04-11
13 1874-DEL-2015-CLAIMS [11-04-2022(online)].pdf 2022-04-11
13 1874-DEL-2015-FER_SER_REPLY [11-04-2022(online)].pdf 2022-04-11
14 1874-DEL-2015-ABSTRACT [11-04-2022(online)].pdf 2022-04-11
14 1874-DEL-2015-FER.pdf 2021-10-17
15 1874-DEL-2015-FORM 18 [25-04-2019(online)].pdf 2019-04-25
15 1874-DEL-2015-US(14)-HearingNotice-(HearingDate-13-03-2024).pdf 2024-02-14
16 1874-del-2015-Correspondence Others-(13-10-2015).pdf 2015-10-13
16 1874-DEL-2015-Correspondence to notify the Controller [19-02-2024(online)].pdf 2024-02-19
17 1874-del-2015-Form-1-(13-10-2015).pdf 2015-10-13
17 1874-DEL-2015-Written submissions and relevant documents [28-03-2024(online)].pdf 2024-03-28
18 1874-DEL-2015-FORM-8 [29-03-2024(online)].pdf 2024-03-29
18 1874-del-2015-GPA-(13-10-2015).pdf 2015-10-13
19 1874-DEL-2015-PatentCertificate31-05-2024.pdf 2024-05-31
19 1874-del-2015-Form-1-(24-06-2015).pdf 2015-06-24
20 1874-DEL-2015-IntimationOfGrant31-05-2024.pdf 2024-05-31
20 1874-del-2015-Form-2-(24-06-2015).pdf 2015-06-24
21 1874-del-2015-Form-3-(24-06-2015).pdf 2015-06-24
21 1874-DEL-2015-EVIDENCE FOR REGISTRATION UNDER SSI [25-09-2024(online)].pdf 2024-09-25
22 1874-del-2015-Form-5-(24-06-2015).pdf 2015-06-24
22 1874-DEL-2015-EDUCATIONAL INSTITUTION(S) [25-09-2024(online)].pdf 2024-09-25

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