Claims:We claim:

1. A duct system (6) for preventing cross contamination of infection comprises:
a receiving and conveying channel (8) capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle;
a flow adaptor (9) capable of converting the received sectional air from the negative pressure generating unit (4) into a suitable sectional streamline flow of the receiving and conveying channel (8); and/or
an air discarder (10) adjoined to the Air-Conditioning unit (12) for discarding the excess disinfected air through a conduit (14); and
wherein the receiving and conveying channel (8) is having a flexible joint (11) adapted to accommodate the manufacturing and assembly variations of the duct system (6) for the customization of its placement in the close proximity of the patient.
2. The duct system as claimed in claim 1, wherein said receiving and conveying channel is entirely a convoluted pipe or entirely a fixed pipe or partially convoluted and partially fixed pipe.
3. The duct system as claimed in claim 1, wherein said flexible joint (11) is formed by joining the convoluted pipe (8a) with the fixed pipe (8b), connected with each other at one of their end portions.
4. The duct system as claimed in claim 1, wherein said conduit (14) is having an inlet (15) extending from the air discarder (10) and an outlet (16) going out of the patient compartment (3) in order to avoid backflow of the disinfected air for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit (12).
5. The duct system as claimed in claim 1, wherein said receiving and conveying channel (8) has an inlet fixedly or flexibly affixed onto the negative pressure generating unit (4) through the flow adaptor (9).
6. The duct system as claimed in claim 1, wherein said duct system operates most efficiently in a closed environment.
7. A vehicle (1) partitioned by a driver compartment (2) and a patient compartment (3) for preventing cross contamination of infection, wherein the patient compartment (3) comprises:
a negative pressure generating unit (4) integrated with a disinfecting unit (5) capable of constantly sucking in the air circulating inside the vehicle (1) for its disinfection;
a duct system (6) capable of receiving and advancing the disinfected air for circulating inside the vehicle (1) or discarding out of the vehicle (1); and
wherein said negative pressure generating unit (4) is mounted on a mounting platform (7) in the close proximity of the patient (P), wherein the mounting platform (7) serves as the function for both support and storage.
8. The vehicle (1) as claimed in claim 7, wherein said duct system (6)is located in the close proximity of the patient.
9. The vehicle as claimed in claim 7, wherein said duct system (6) comprises of a receiving and conveying channel (8) and a flow adaptor (9).
10. The vehicle as claimed in claim 7, wherein said duct system comprises of a receiving and conveying channel (8), a flow adaptor (9) and an air discarder (10).
11. The vehicle as claimed in claim 9 or 10, wherein said receiving and conveying channel has a flexible joint (11) adapted to accommodate the manufacturing and assembly variations of the duct system (6) for the customization of its placement in the close proximity of the patient.
12. The vehicle as claimed in claim 7, wherein said duct system connects the negative pressure generating unit (4) with an Air-Conditioning unit (12) of the vehicle (1) for re-circulating the cooled disinfected air back in the vehicle (1).
13. The vehicle as claimed in claim 7, wherein said duct system (6) connects the negative pressure generating unit (4) with a vehicle’s outlet vent (13) for discarding the disinfected air out of the vehicle from the downward direction.
14. The vehicle as claimed in claim 10, wherein the air discarder (10) is adjoined to the Air-Conditioning unit (12) for discarding the excess disinfected air through a conduit (14).
15. The vehicle as claimed in claim 14, wherein said conduit (14) is having an inlet (15) extending from the air discarder (10) and an outlet (16) going out of the patient compartment (3)in order to avoid backflow of the disinfected air for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit (12).
16. The vehicle as claimed in claim 7, wherein the vehicle is closed from all of its sides and having 3 or more wheels.
17. A method for preventing cross contamination of infection using a duct system (6) in a closed environment comprises:
disinfecting the circulating air and of a negative pressure vehicle (1) comprises:
sucking in the contaminated air of the vehicle with the help of the negative pressure generating unit (4)mounted inside the closed environment, wherein the negative pressure generating unit (4) is integrated with a disinfecting unit;
disinfecting the contaminated air using a disinfecting unit (5) integrated within the negative pressure generating unit (4);
changing and channelizing the sectional flow of the disinfected air as per the requirement through a flow adaptor(9) affixed onto the negative pressure generating unit (4);
receiving and advancing the disinfected air through the duct system (6) andfor re-circulation in the same environment viaan operable air-conditioning unit; or
receiving and advancing the disinfected air through the duct system (6)and discarding it directly out of the closed environment.
18. The method as claimed in claim 17, wherein said receiving and advancing the disinfected air through the duct system (6) comprises of discarding the excess disinfected air via an air discarder (10) through a conduit (14) of the duct system (6).
19. The method as claimed in claim 18, wherein said discarding the excess disinfected air comprises of advancing the excess disinfected air through an inlet (15) and outlet (16) of the conduit (14) extended from the air discarder (10) towards out of the closed environmentin order to avoid backflow of the disinfected air and for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit.
20. The method as claimed in claim 18, wherein the closed environment is preferably a closedvehicle having 3 or more wheels.
, Description:A Duct System for preventing Cross Contamination of Infection and a Vehicle thereof
Field of the Invention
This invention relates to preventing cross contamination of infection among individuals. More particularly, this invention relates to transporting of infected patients from one place to another in a vehicle.
Background of the Invention
There have been various pandemics this world has suffered in the past and a lot of them have been brought under control but not yet eradicated permanently, hence continue pose infectious threat to humans. The kind of lifestyle, we humans are leading these days, it is inevitable for such diseases to take birth and spread at a large scale. It has been observed that the biggest victims of such pandemics are the doctors, hospital staffs and paramedics, because they are the people who are the most vulnerable for getting infected, especially during the transfer of infected patients from one place to another or while transporting the infected patient in an ambulance. In such events, it’s very common for the paramedics to get infected in an attempt to save other’s life.
The conventional vehicles are not well equipped to handle the transfer of patients with infectious disease as they are fitted with standard air-conditioning system and other equipment. Below are the disclosed few prior arts attempting to solve the problem of cross-contamination in the existing vehicles:
CN111361392discloses a protective ambulance. A cabin of the protective ambulance is divided into a driving cabin and a negative pressure cabin by a partition wall; a negative-pressure purificationand disinfection cabinet is arranged in the negative pressure cabin; a fresh air system is arranged at the top of the negative-pressure purification and disinfection cabinet; the fresh air system provides fresh air for the negative pressure cabin; a purification and disinfection device is arranged in the middle of the interior of the negative-pressure purification and disinfection cabinet; an airinlet window and a negative pressure generation device are arranged at the lower part in the negative-pressure purification and disinfection cabinet; an exhaust pipeline is arranged below the negative-pressure purification and disinfection cabinet; one end of the exhaust pipeline is connected with an exhaust port of the purification and disinfection device, and the other end of the exhaust pipeline is connected with a chassis exhaust system; gas in the negative pressure cabin enters the purification and disinfection device through the air inlet window to be purified and disinfected, and residual gas after purification and disinfection enters the chassis exhaust system through the exhaust pipeline. The existing problems that was there in the prior art such as cross infection and leaks of the suspicious pollution gas in the vehicle can be solved, and safe transfer of new coronal pneumonia patients can be achieved.
CN104523385 discloses a full-negative-pressure laminar flow efficient disinfecting infectious disease care ambulance comprises a carriage which is provided with an air inlet and an exhaust opening. An air inner circulating component and an exhaust component are arranged in the carriage. The air inner circulating component comprises a first filter, a condenser, a second filter and an evaporator which are connected in sequence. The input end of the first filter is provided with an air inlet hole for air in the carriage to enter the first filter. The output end of the evaporator is provided with an air outlet hole through which air is exhausted to the inner portion of the carriage. The air circulating component comprises a negative pressure generator. The output end of the negative pressure generator is communicated with the exhaust opening and is used for guiding air in the carriage to the outer portion of the carriage. The input end of the negative pressure generator is provided with a third filter. A negative pressure environment is formed in the carriage, air circulating in the carriage and air exhausted out of the carriage are subjected to disinfecting purifying treatment respectively, the fact that carriage inner air has high cleanliness, and meanwhile harmful bacterium outward dissemination is avoided.
CN101697933 discloses a negative pressure ambulance, which comprises an ambulance body, a head cover, an air pipe, and a negative pressure purification system in the ambulance, wherein the head cover is semi-closed, the back part thereof is provided with an air outlet; the air outlet is connected with the negative pressure purification system in the ambulance through the air pipe. The negative pressure ambulance has the advantages that: 1. the air exhausting and air exchanging efficiencies are high, and the movement of people around cannot influence the air exchanging effect and efficiency. Air current which is at the periphery of the head cover and enters the head cover is very obvious and stable, so that the air breathed out from the mouth of a patient cannot diffuse into a medical cabin, and the possibility of cross infection between doctors and patients is controlled; 2. the negative pressure ambulance is simple to manufacture, can be made by reconstructing a conventional general vehicle without adding the tightness of the conventional vehicle, and avoids additional reconstructing difficulties and cost caused by achieving a negative pressure standard in the cabin of the negative pressure ambulance; 3. the comfort level of the patient is improved greatly; and 4. the negative pressure ambulance is convenient to use; and the head cover can be matched with various styles of stretchers, so the adaptability is wide.
However, it is observed in the above prior arts that the disclosed vehicle or ambulances are capable of disinfecting or purifying the internal air and safely dispose the disinfected air out of the vehicle in order to cause no harm to the outer environment and at the same time preventing the cross contamination of infection between the patient and the paramedics. But still, the rate at which the disinfection of the internal air takes place along with expelling out the disinfected air may not be efficient as the negative pressure unit, disinfection means and air conditioning unit in such vehicles perform their functions independently and not coherent with each other, there is a high risk of leakage of contaminated air and spread of virus within the vehicle due to the lack of rapid coordination among negative pressure unit, disinfection means and air conditioning unit of the vehicle. None of the prior arts have worked on circulating the same disinfected air within the vehicle and ensuring no volume of air reaching to the paramedics is left infected. Also, the disclosed negative pressure system in the vehicles of the above prior arts have a fixed structure meant and cannot be retrofitted in any other vehicle for preventing the cross-contamination of infection and once manufactured, cannot be further modified.
It would be desirable, therefore, to develop an improved and innovative negative pressure vehicle, which is capable of efficiently disinfecting and cooling the internal air and circulating the same within the vehicle enabling to minimize the power consumption, thereby obviating the challenges that exists in the prior arts as mentioned above.

Summary of the Invention
It is an objective of the present invention to provide a negative pressure vehicle capable of preventing the cross contamination of infection between the patients and paramedics within the vehicle.
It is an objective of the present invention to provide a negative pressure vehicle capable of avoiding the spread of infection even out of the vehicle.
It is an objective of the present invention to provide a duct system in a negative pressure vehicle, which is capable of being retrofitted in any existing negative pressure vehicle.
It is an objective of the present invention to provide a duct system in a negative pressure vehicle, which is capable of being integrated with the air-conditioning unit of the vehicle.
It is an objective of the present invention to provide a negative pressure vehicle capable of minimizing the AC’s power consumption by repeatedly circulating the pre-cooled disinfected air.
It is an objective of the present invention to provide a negative pressure vehicle which is easily serviceable at user end.
The above and other objectives of the present invention are achieved according to the following embodiments of the present invention. However, the disclosed embodiments are exemplary based on the preferred and best mode of the invention and not limit the scope of the present invention.
In accordance with one exemplary embodiment of the present invention, there is provided a duct system for preventing cross contamination of infection comprises a receiving and conveying channel capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle, a flow adaptor capable of converting the received sectional air from the negative pressure generating unit into a suitable sectional streamline flow of the receiving and conveying channel and/or an air discarder adjoined to the Air-Conditioning unit for discarding the excess disinfected air through a conduit and wherein the receiving and conveying channel is having a flexible jointadapted to accommodate the manufacturing and assembly variations of the duct systemfor the customization of its placement in the close proximity of the patient.
In accordance with above embodiment of the present invention, wherein said receiving and conveying channel is entirely a convoluted pipe or entirely a fixed pipe or partially convoluted and partially fixed pipe, wherein said flexible joint is formed by joining the convoluted pipe with the fixed pipe, connected with each other at one of their end portions.
In accordance with one embodiment of the present invention, there is provided a duct system for preventing cross contamination of infection comprises a receiving and conveying channel capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle, a flow adaptor capable of converting the received sectional air from the negative pressure generating unit into a suitable sectional streamline flow of the receiving and conveying channel and/or an air discarder adjoined to the Air-Conditioning unit for discarding the excess disinfected air through a conduit and wherein the receiving and conveying channel is having a flexible jointadapted to accommodate the manufacturing and assembly variations of the duct systemfor the customization of its placement in the close proximity of the patient, wherein said conduit is having an inlet extending from the air discarder and an outlet going out of the patient compartment in order to avoid backflow of the disinfected air for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit.
In accordance with one of the above embodiment of the present invention, wherein said receiving and conveying channel has an inlet fixedly or flexibly affixed onto the negative pressure generating unit through the flow adaptor.
In accordance with one embodiment of the present invention, there is provided a duct system for preventing cross contamination of infection comprises a receiving and conveying channel capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle, a flow adaptor capable of converting the received sectional air from the negative pressure generating unit into a suitable sectional streamline flow of the receiving and conveying channel and/or an air discarder adjoined to the Air-Conditioning unit for discarding the excess disinfected air through a conduit and wherein the receiving and conveying channel is having a flexible jointadapted to accommodate the manufacturing and assembly variations of the duct systemfor the customization of its placement in the close proximity of the patient, wherein said conduit is having an inlet extending from the air discarder and an outlet going out of the patient compartment in order to avoid backflow of the disinfected air for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit, wherein said duct system operates most efficiently in a closed environment.
In accordance with one embodiment of the present invention, there is provided a vehicle partitioned by a driver compartment and a patient compartment for preventing cross contamination of infection, wherein the patient compartment comprises a negative pressure generating unit integrated with a disinfecting unit capable of constantly sucking in the air circulating inside the vehicle for its disinfection, a duct system capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle and wherein said negative pressure generating unit is mounted on a mounting platform in the close proximity of the patient, wherein the mounting platform serves as the function for both support and storage.
In accordance with one embodiment of the present invention, there is provided a vehicle partitioned by a driver compartment and a patient compartment for preventing cross contamination of infection, wherein the patient compartment comprises a negative pressure generating unit integrated with a disinfecting unit capable of constantly sucking in the air circulating inside the vehicle for its disinfection, a duct system capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle and wherein said negative pressure generating unit is mounted on a mounting platform in the close proximity of the patient, wherein the mounting platform serves as the function for both support and storage, wherein said duct system is located in the close proximity of the patient, wherein said duct system comprises of a receiving and conveying channel and a flow adaptor.
In accordance with one embodiment of the present invention, there is provided a vehicle partitioned by a driver compartment and a patient compartment for preventing cross contamination of infection, wherein the patient compartment comprises a negative pressure generating unit integrated with a disinfecting unit capable of constantly sucking in the air circulating inside the vehicle for its disinfection, a duct system capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle and wherein said negative pressure generating unit is mounted on a mounting platform in the close proximity of the patient, wherein the mounting platform serves as the function for both support and storage, wherein said duct system is located in the close proximity of the patient, wherein said duct system comprises of a receiving and conveying channel, a flow adaptor and an air discarder.
In accordance with one of the above embodiments of the present invention, wherein said receiving and conveying channel has a flexible joint adapted to accommodate the manufacturing and assembly variations of the duct systemfor the customization of its placement in the close proximity of the patient.
In accordance with one embodiment of the present invention, there is provided a vehicle partitioned by a driver compartment and a patient compartment for preventing cross contamination of infection, wherein the patient compartment comprises a negative pressure generating unit integrated with a disinfecting unit capable of constantly sucking in the air circulating inside the vehicle for its disinfection, a duct system capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle and wherein said negative pressure generating unit is mounted on a mounting platform in the close proximity of the patient, wherein the mounting platform serves as the function for both support and storage, wherein said duct system connects the negative pressure generating unit with an Air-Conditioning unit of the vehicle for re-circulating the cooled disinfected air back in the vehicle.
In accordance with one embodiment of the present invention, there is provided a vehicle partitioned by a driver compartment and a patient compartment for preventing cross contamination of infection, wherein the patient compartment comprises a negative pressure generating unit integrated with a disinfecting unit capable of constantly sucking in the air circulating inside the vehicle for its disinfection, a duct system capable of receiving and advancing the disinfected air for circulating inside the vehicle or discarding out of the vehicle and wherein said negative pressure generating unit is mounted on a mounting platform in the close proximity of the patient, wherein the mounting platform serves as the function for both support and storage,, wherein said duct system connects the negative pressure generating unit with a vehicle’s outlet vent for discarding the disinfected air out of the vehicle from the downward direction.
In accordance with one of the above embodiments of the present invention, wherein the air discarder is adjoined to the Air-Conditioning unit for discarding the excess disinfected air through a conduit, wherein said conduit is having an inlet extending from the air discarder and an outlet going out of the patient compartment in order to avoid backflow of the disinfected air for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit, wherein the vehicle is closed from all of its sides and having 3 or more wheels.
These and other embodiments, processes and features of the invention will become more fully apparent when the following detailed description is read with the accompanying drawing figures. However, both the foregoing summary of the invention and the following detailed description of it represent one potential embodiment and are not restrictive of the invention or other alternate embodiments of the invention.
Brief Description of the Drawings
Figure 1 shows the vehicle for preventing cross contamination of infection.
Figure 2 shows the duct system in a vehicle helping in the cross contamination of infection.
Detailed Description of the Invention
In accordance with one embodiment of the present invention, there is provided a method for preventing cross contamination of infection using a duct system in a closed environment comprisesdisinfecting the circulating air and of a negative pressure vehicle comprisessucking in the contaminated air of the vehicle with the help of the negative pressure generating unit mounted inside the closed environment, wherein the negative pressure generating unit is integrated with a disinfecting unit, disinfecting the contaminated air using a disinfecting unit integrated within the negative pressure generating unit, changing and channelizing the sectional flow of the disinfected air as per the requirement through a flow adaptor affixed onto the negative pressure generating unit, receiving and advancing the disinfected air through the duct system and for re-circulation in the same environment via an operable air-conditioning unit orreceiving and advancing the disinfected air through the duct system (6) and discarding it directly out of the closed environment, wherein the closed environment is preferably a closed vehicle having 3 or more wheels.
In accordance with just above embodiment of the present invention, wherein said receiving and advancing the disinfected air through the duct system comprises of discarding the excess disinfected air via an air discarder through a conduit of the duct system, wherein said discarding the excess disinfected air comprises of advancing the excess disinfected air through an inlet and outlet of the conduit extended from the air discarder towards out of the closed environment in order to avoid backflow of the disinfected air and for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit.
Referring to Figure 1, a duct system (6) is shown that comprises of duct pipe as a receiving and conveying channel (8), a flow adaptor (9) and an air discarder (10), wherein said receiving and conveying channel(8) is connected to the negative pressure generating unit (4) for receiving and conveying the disinfected air via the flow adaptor (9), wherein the disinfected air is received from the disinfecting unit (5) of the negative pressure generating unit (4), wherein the disinfecting unit comprises of HEPA filter and UV filter (not shown in the drawing) for disinfecting the air collected by the negative pressure generating unit (4), wherein the receiving and conveying channel (8) has an inlet and an outlet, wherein the inlet is connected to the disinfecting unit (5) of the negative pressure generating unit (4) for receiving and conveying disinfected air to the air conditioning unit (12) via the air discarder (10), wherein the outlet of the receiving and conveying channel (8) is connected to the air discarder (10), wherein the air discarder (10) is adjoined to the Air-Conditioning unit (12) helping to avoid the backflow of the disinfected air from the air conditioning unit (12) by eliminating excess disinfected air remained after the air conditioning unit (12) has sucked up the disinfected air up to its capacity, thus ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit. Further, the air conditioning unit (12) cools the disinfected air and releases back into the same environment from which it is sucked up. In this repetitive process of sucking up the disinfected air and releasing it back into the same environment by the air conditioning unit (12), the electricity consumption by the air conditioning unit (12) is immensely minimized as the air conditioning unit (12) after some time starts sucking up the existing cooled air earlier released by the air conditioning unit (12) and either it does not require further cooling or require less cooling. The elimination of excess disinfected air takes place through the air discarder (10) via a conduit (14), wherein the conduit (14) has an inlet connected to the air discarder for receiving the excess disinfected air and an outlet (13) for throwing the excess disinfected air out of the designated environment. The most preferred installable environment for the duct system (6) is an enclosed vehicle having 3 or more wheels. In addition, the duct system (6) is flexible enough to get installed in any closed environment and carry out the same functions. The receiving and conveying channel (8) is having a flexible joint (11) adapted to accommodate and compensate the manufacturing and assembly variations of the duct system (6) for the customization of its placement inside the closed environment. The duct system (6) is placed usually in theclose proximity of the subject, wherein, the subject can be an infected patient (P).
Referring to Figure 2, a vehicle 1 is shown which is partitioned by a driver compartment 2 and a patient compartment 3, wherein the patient compartment comprises of a negative pressure generating unit (4) mounted on a mounting platform (7) in the close proximity of the patient (P) for constantly sucking in the air circulating inside the air, wherein a disinfecting unit (5) is integrated within the negative pressure generating unit (4) for disinfection of the air circulating inside the vehicle (1). There is provided a duct system (6) located in the close proximity of the patient for receiving and advancing the disinfected air for circulating inside the vehicle (1) or discarding out of the vehicle (1), wherein the duct system (6) comprises of a receiving and conveying channel (8), a flow adaptor (9) and an air discarder (10), wherein the duct system (6) is adapted to accommodate and compensate the manufacturing and assembly variations in different vehicles (6) for the customization of its placement in the close proximity of the patient, wherein said duct system connects the negative pressure generating unit (4) with an Air-Conditioning unit (12) of the vehicle (1) for re-circulating the cooled disinfected air back in the vehicle (1), wherein the air discarder (10) is adjoined onto the bottom of the Air-Conditioning unit (12) that receives the disinfected air from the duct system (6) for conveying the disinfected air to the air-conditioning unit (12) and discarding the excess disinfected air remained after the air-conditioning unit (12) sucks up the air up to its capacity in order to avoid backflow of the disinfected air for ensuring the smooth functioning and avoiding malfunctioning of the Air-Conditioning unit (12). In such vehicles, the electricity consumption by the air conditioning units are highly minimized by pre-cooling of the circulating air inside the vehicle, the disinfected air received by the air-conditioning unit 12 is already cooled to some extent, so it does not require further cooling or require less cooling therefore air-conditioning unit 12 utilizes almost no energy or very less energy in cooling the disinfected air.
While the invention is amenable to various modifications and alternative forms, some embodiments have been illustrated by way of example in the drawings and are described in detail above. The intention, however, is not to limit the invention by those examples and the invention is intended to cover all modifications, equivalents, and alternatives to the embodiments described in this specification.

The embodiments in the specification are described in a progressive manner and focus of description in each embodiment is the difference from other embodiments. For same or similar parts of each embodiment, reference may be made to each other.

It will be appreciated by those skilled in the art that the above description was in respect of preferred embodiments and that various alterations and modifications are possible within the broad scope of the appended claims without departing from the spirit of the invention with the necessary modifications.

Based on the description of disclosed embodiments, persons skilled in the art can implement or apply the present disclosure. Various modifications of the embodiments are apparent to persons skilled in the art, and general principles defined in the specification can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments in the specification but intends to cover the most extensive scope consistent with the principle and the novel features disclosed in the specification.