FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
& THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
PORTABLE WATER PURIFICATION SYSTEM
TATA CONSULTANCY SERVICES LTD.,
an Indian Company
of Nirmal Building, 9th Floor, Nariman Point, Mumbai 400 021,
Maharashtra, India
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF THE INVENTION
This invention relates to the field of purification of water.
In particular, this invention relates to portable water purification system.
DEFINITIONS OF TERMS USED IN THE SPECIFICATION
The expression 'wavelength' in the specification refers to the distance between consecutive corresponding points of the same phase such as crests, troughs, or zero crossings of the light wave. The unit of measurement of wavelength is nanometer (nm).
The expression 'germicidal' in the specification refers to an ability of an agent to kill germs, especially pathogenic microorganisms.
These definitions are in addition to those expressed in the art.
BACKGROUND OF THE INVENTION
With an ever-increasing population, the demand for water has increased and is more than the available supply of water. Many municipal water systems are struggling with the ever-increasing demand on available drinkable water. The natural sources of water do not have enough water to satiate the needs of an exploding population. Such a shortage of available drinking water results in usage of impure water (under dire circumstances) that is unhygienic and unfit for consumption.
Thousands of people die worldwide every day due to infections from water bacteria and viruses. The growth of 60 million children is underdeveloped

because of recurring diarrhea and other illnesses. The majority of these victims are people who live in economically underdeveloped countries. In ;hese particular regions, polluted sources of surface water and insufficiently functioning municipal water distribution systems lead to the transmission of waterborne bacterial and viral diseases.
For supplying clean usable water, a water purification system is always required. Water purification systems remove the undesirable chemicals, materials, and biological contaminants from raw water. The goal is to make water suitable for specific purposes. Not all packaged water in the market is safe for consumption. Moreover, these purification systems are not portable. Water purifying and distribution systems can also be very expensive. Construction of such systems can take a considerable amount of time.
To overcome the aforementioned problems, there is felt a need for a purification system which is portable and effective,
Some purifying systems which use germicidal ultraviolet (UV) rays for
disinfecting water have been implemented in the past like the United States
Patent Application 20090088230 which discloses a watch phone for
purifying water by immersing watch phone in container containing water for
human consumption purposes. But this has several disadvantages like it has
a an external attachment for an optical light conducting probe (rod element)
which optically couples to the ultra violet source and is immersed in water
for purifying it. The use external probe makes this system fragile and in case
this probe is damaged or suffers wear and tear because of frequent use then
the system becomes dysfunctional. :

Other such system implemented before which are not so fragile suffers from several other disadvantages like large and bulky size making it non-movable; and these systems are also expensive and not cost effective. In the light of the above stated disadvantages associated with existing germicidal UV water purification systems, there is a need of an improved water purification system that needs fewer machinery and is easily affordable to large segments of the population and is portable and not fragile.
OBJECTS OF THE INVENTION
An object of the invention is to provide a portable system for purification and disinfection of water to potable limits.
Another object of the invention is to provide an efficient and reliable system for purification of water.
Still another object of the invention is to develop a simple and easy to use system for water purification.
Yet another object of the invention is to provide a system for water purification which is easily available to the users even in rural areas.
One more object of the invention is to provide a system for water purification that is affordable and cost effective to large segments of the population.

Still another object of the invention is to provide a system for water purification which is lightweight, compact, and easy to use by all age groups.
Yet another object of the invention is to provide a system for water purification that includes less machinery.
Still another object of the invention is to provide a system for water purification that operates in the area where power supply is not present.
Yet another object of the invention is to provide a system for water purification which is environment friendly.
SUMMARY OF THE INVENTION
In accordance with an aspect of the present invention a system for disinfection of liquids to potable limits is provided, the system comprising a battery operated handheld device characterized in that at least one ultra violet radiation generating means adapted to generate germicidal ultra violet radiations to be bombarded on the liquid stored in a container without immersing the handheld device inside the container.
Typically, the handheld device includes
■ at least one processor for triggering, de-triggering, setting time and setting intensity of the ultra violet radiation generating means on user instructions; and
■ a user interface accessible by the user to provide the instructions.

In accordance with another aspect of the present invention the handheld device includes
■ microphone means co-operating with the user interface and adapted to receive sounds corresponding to pre-defined instructions; and
■ sound processing means adapted to process received sounds and communicate corresponding instructions to the processor.
In accordance with yet another aspect of the present invention the handheld device includes keypad co-operating with the user interface and having at least one key to be pressed by the user to generate instructions to be read by the processor.
In accordance with still another aspect of the present invention the handheld device includes touch screen facilitation means co-operating with the user interface and adapted to identify touch of user on certain pre-designated areas on the screen of the handheld device to generate instructions to be read by the processor.
Typically, the ultra violet radiation generating means is an ultra violet light
emitting diode.
Typically, the handheld device is a mobile phone.

In accordance with still further an aspect of the present invention the handheld device includes notification means adapted to notifying the user after a pre-defined time period set by the user.
Typically, the notification means is a speaker which produces a pre-defined sound after a pre-defined time period set by the user.
Typically, the notification means is a display unit which produces a visual effect after a pre-defined time period set by the user.
In accordance with yet another aspect of the present invention a method for disinfection of liquids to potable limits is provided, the method comprising the steps of
■ accepting user instructions for disinfection of liquid;
■ generating ultra violet radiations for disinfection corresponding to the instructions; and
■ switching off the generation of ultra violet radiations.
Typically, the step of switching off the generation of ultra violet radiations includes the step of notifying the user.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
The invention will now be described with the help of accompanying drawings, in which:

FIGURE 1 illustrates a schematic diagram of a system for disinfection of liquids to potable limits; and
FIGURE 2 illustrates a flow diagram of a method for disinfection of liquids to potable limits in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The invention will now be described with reference to the accompanying drawings which do not limit the scope and ambit of the invention. The description provided is purely by way of example and illustration.
The disadvantages of the existing systems have been tried to overcome by the system proposed by this invention. The invention proposes a system for disinfection of liquids (water) using the UV radiations in a more effective and less costly way. Also, the disadvantage of fragility of some the existing systems the invention proposes a sturdy system.
In accordance with an embodiment of the present invention envisages a
solution for water purification which is effective and easily available to users
everywhere.
Hand held battery operated devices, for instance mobile phones and the like are compact devices and can be easily carried everywhere and are lightweight devices, which are very convenient to use.
Electronic equipment manufacturing companies are coming up with newer electronic gadgets every month which are embedded with advanced features; these are easily available all over the world. In addition, the prices of these

electronic gadgets are getting more and more affordable for huge masses of people.
For instance the system is a mobile phone based system it is affordable and convenient for urban community as well the rural population alike. Moreover, it has been seen that rural telephony market is growing at a surprising rate. According to a TRAI (Telecom Regulatory Authority of India) report, there has been a rise of 18% in the use of the mobile phones by rural subscribers.
The invention exploits this growth in the telecommunication sector to provide a mobile based system for disinfection of liquids (water) which is affordable by rural populace.
The invention basically proposes a portable handheld device comprising a UV (Ultraviolet) radiation (light or rays) emitting source, for instance LED (Light emitting diode), which emits germicidal UV radiations for disinfection of liquids.
This invention uses germicidal UV rays, which provides an effective method to disinfect water without heat or chemicals. The main advantage of using germicidal UV rays for water treatment over other methods, specifically chemical treatment, is that it does not introduce any chemicals to the water which may cause certain ill side effects in long term usage of such chemically treated water.

Also, considering the systems using carbon fiber and the like for purification only filter the water to micron levels and still there is a chance of existence of micro-organisms which are in sub-micron dimensions.
Unlike such devices UV-based systems do not filter the water rather they kill the organic material that causes illness including micro-organisms, disease causing phytoplanktons. Germicidal UV rays go through the harmful bacteria, viruses and phytoplanktons in the water and destroy their ability to reproduce. Without this ability, these organisms die and no longer pose a health threat. It is a simple and very effective process.
It produces no bi-products, and it does not even modify the taste, pH, or other properties of the water. It also does not require expensive filters. Since there are no bi products to this method of water treatment, it is also not harmful to the plumbing system.
For the purposes of disinfection certain specific UV radiations are used called as germicidal UV rays/Basically UV radiations are divided into three wavelength ranges: A, B and C. The shortest wavelength of UV radiation (UV-C), between 100 and 280nm, poses the maximum risk to micro-organisms. These are known as the germicidal UV wavelength range. UV sources are fabricated to emit UV-C and they are well regulated for safety.
Germicidal UV is known to be highly effective against bacteria, viruses, algae, molds and yeasts, and disease causing oocysts like Cryptosporidium
and giardia.

Hepatitis virus and Legion Ella pneumophila which have otherwise shown to survive for considerable periods in the presence of chlorine and other such chemicals are readily eliminated by germicidal UV treatment. Germicidal UV radiations destroy all water-borne microorganisms, including bacteria and viruses. The dosage necessary to inactivate a microorganism is a product of time and concentration.
The most effective single wavelength is typically UV at 265nm, however researches has shown that UV radiation at wavelengths 271nm and 263nm are the most effective for the deactivation of specific target organisms. UV LED has distributed and conformal layout of point sources in the system. It has the possibility of using the preferred wavelength of 265nm instead of 254nm.
Referring to figure 1 there is shown a system 100 including a hand held device 103 for disinfection of liquids using ultra violet radiations. The hand held device 103 includes ultra violet radiation generating means represented by reference numeral 105, preferably ultra violet light emitting diodes (UV LEDs). Four UV LEDs 105a, 105b, 105c, and 105d are shown in the figure 1, which are placed at different places on the hand held device 103. However, the number and location of LEDs can vary depending upon frequency of use, battery power ad the like.
Once triggered or started the ultra violet radiation generating means 105 (105a, 105b, 105c, 105d) the UV radiations emitted are directed or bombarded on to the liquid stored in a container 107 without immersing the handheld device 103 into the container 107.

The hand held device 103 also includes processor (not shown in the figure) for controlling UV LEDs including the triggering, de-triggering, setting time and setting intensity of said ultra violet radiation generating means on user instructions. These instructions are taken using a user interface (not shown in the figure) accessible by the user to provide the instructions, for instance the interface can be an application running on the user's hand held device 103, the application hiving selectable options for triggering, de-triggering, setting time and setting intensity of said ultra violet radiation generating means 105.
In accordance with another embodiment of the present invention the user can give instructions for controlling the ultra violet generation means depending upon the quantity of liquid to be disinfected, time in which disinfection process should be complete and the like. The hand held device 103 includes microphone means co-operating with the user interface (not shown in the figure) and adapted to receive sounds corresponding to pre-defined instructions. A sound processing means (not shown in the figure) is provided in the hand held device 103 which is adapted to process received sounds and communicate corresponding instructions to the processor for controlling the ultra violet radiation generating means 105.
Also, the present invention envisages the hand held device 103 including a keypad 109 co-operating with the user interface, keys of which are to be pressed by the user to generate instructions to be read by the processor. For touch screen enabled handheld devices 103 includes touch screen facilitation means (not shown in the figure) which is co-operating with said user

interface and is adapted to identify touch of user on certain pre-designated areas on the screen of the handheld device 103 to generate instructions to be
read by the processor.
In accordance with yet another embodiment of the present invention, once the processor of hand held device 103 is given instructions for triggering the ultra violet radiation generating means 105 for a specified time, then after the completion of set time the user is notifies using a notification means (not shown in the figure). For instance this notification means can be a display unit which produces pre specified visual effects after the time is lapsed or notification means can be speaker which produces pre specified sound or a combination of both.
In accordance with still another embodiment of the present invention the user interface of the hand held devices guides users about the intensity and time required for disinfecting certain specified amount of liquid.
In accordance with still further an embodiment of the present invention the user interface can select the mode of giving instructions in case the hand held device is voice enabled, touch screen, and has keypad.
In accordance with one more embodiment of the present invention the invention envisages a method for disinfection of liquids to potable limits, the method comprising the following steps
■ accepting user instructions for disinfection of liquid, 2001;
■ generating ultra violet radiations for disinfection corresponding to said instructions, 2003; and

The step of switching off the generation of ultra violet radiations also includes the step of notifying the user.
TECHNICAL ADVANCEMENTS
The technical advancements offered by the present invention include the realization of:
■ a portable system for purification and disinfection of water to potable limits;
■ an efficient and reliable system for purification of water;
■ a simple and easy to use system for water purification;
■ a system for water purification which is easily available to the users, even in rural areas;
■ a system that is affordable and- cost effective to large segments of the
population;
■ a system for water purification which is lightweight, compact, and easy to use by all age groups;
■ a system for water purification that includes less machinery;
■ a system for water purification that operates in the area where power supply is not available; and

■ a system for water purification that is environment friendly.
While considerable emphasis has been placed herein on the particula features of this invention, it will be appreciated that various modification can be made, and that many changes can be made in the preferr© embodiment without departing from the principles of the invention. Thes and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosur herein, whereby it is to be distinctly understood that the foregoin descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

WE CLAIM
1. A system for disinfection of liquids to potable limits, said system
comprising a battery operated handheld device characterized in that at
least one ultra violet radiation generating means adapted to generate
germicidal ultra violet radiations to be bombarded on the liquid stored in
a container without immersing said handheld device inside the container.
2. The system as claimed in claim 1, wherein said handheld device includes
■ at least one processor for triggering, de-triggering, setting time and setting intensity of said ultra violet radiation generating means on user instructions; and
■ a user interface accessible by the user to provide the instructions.
3. The system as claimed in claim 2, wherein said handheld device includes
■ microphone means co-operating with said user interface and adapted to receive sounds corresponding to pre-defined instructions; and
■ sound processing means adapted to process received sounds and communicate corresponding instructions to said processor.
4. The system as claimed in claim 2, wherein said handheld device includes
keypad co-operating with said user interface and having at least one key
to be pressed by the user to generate instructions to be read by said
processor.

5. The system as claimed in claim 2, wherein said handheld device includes touch screen facilitation means co-operating with said user interface and adapted to identify touch of user on certain pre-designated areas on the screen of the handheld device to generate instructions to be read by said processor.
6. The system as claimed in claim 1, wherein said ultra violet radiation generating means is an ultra violet light emitting diode.
7. The system as claimed in claim 1, wherein said handheld device is a mobile phone.
8. The system as claimed in claim 1, wherein said handheld device includes notification means adapted to notifying the user after a pre-defined time period set by the user.
9. The system as claimed in claim 8, wherein said notification means is a speaker which produces a pre-defined sound after a pre-defined time period set by the user.

10. The system as claimed in claim 8, wherein said notification means is a display unit which produces a visual effect after a pre-defined time period set by the user.
11. A method for disinfection of liquids to potable limits, said method comprising the steps of
■ accepting user instructions for disinfection of liquid;

■ generating ultra violet radiations for disinfection corresponding to said instructions; and '
■ switching off the generation of ultra violet radiations.
12. The method as claimed in claim 11, wherein the step of switching off the generation of ultra violet radiations includes the step of notifying the user.