Indian Patents. 276962:"A BRIDGING SYSTEM"

Title of Invention	"A BRIDGING SYSTEM"
Abstract	The present invention is related to bridges; more particularly the present invention is related to bridging system to cross small gaps and canals. The bridges are carried on a vehicle having mechanical handling device. The mechanical handling device deploys the bridges onto the small gaps and canals.

Full Text	FIELD OF THE INVENTION The present invention relates to bridges, more particularly the present invention relates to bridging system to cross small gaps and canals. The bridges are carried on a vehicle having mechanical handling device. The mechanical handling device deploys the bridges onto the small gaps and canals. BACKGROUND OF THE INVENTION In the existing bridges the major challenges and constraints were the availability of space over the chassis of the carrier vehicle to place the bridges, the mechanical handling assembly and departure angle of the vehicle, which is critical for cross country mobility. Cross country mobility of a vehicle is termed as the mobility of the vehicle in an area where no proper road conditions exist. No proper road condition refers to an area where bumps, ditches, dunes and all sorts of uneven surfaces exist. The bridges used in existing trends have greater span lengths. These bridges having long span were not useful in bridging small gaps and canals. The need for developing the short span bridges compatible to that of large span bridges in all aspects was major challenge. On the vehicle carrying the bridges there was no space to mount the mechanical handling assembly directly onto the chassis, since platform length of carrier vehicle (TATRA 6 x 6) was limited. OBJECTS OF THE INVENTION The principal object of the present invention is to develop a bridging system for small gaps and canals. Yet another object of the invention is to develop bridge system has length of about 5 m, width of about 3.5 m in transportation mode and of about 4.0 m in deployed condition. Yet another object of the invention is to develop a method of operation for deployment of bridge system. Yet another object of the invention is to develop a method of assembling bridging system. STATEMENT OF INVENTION Accordingly the invention provides for a bridging system comprises: main deck (1) at top with plurality of longitudinal girders (2) and a cross girder (3) at bottom, and folding decks (4) hinged to the main deck (1) on either sides; a method of operation for deployment of bridge system comprises acts of: spreading outriggers (5a) of carrier vehicle (5), positioning crane lock (8) to lock with lifting beam (6a) of mechanical handling device (6) for lifting the bridge system, and placing the bridge system onto gap for deployment; a method of assembling bridging system comprises acts of: mounting bridge system onto carrier vehicle (5), and installing mechanical handling device (6) onto mounting assembly (9) of the carrier vehicle (5) for deployment of the bridging system. BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS Figure l(a) and (b): shows the perspective view of the bridge system. Figure 2 (a): shows the front view of the bridge system. Figure 2 (b): shows the side view of the bridge system. Figure 2 (c): shows the top view of the bridge system. Figure 3: shows the perspective view of the carrier vehicle with the mounting assembly and the mechanical handling device in unloaded condition. Figure 4 (a): shows the perspective view of the carrier vehicle with the mounting assembly and the mechanical handling device in loaded condition. Figure 4 (b): shows the perspective of the carrier vehicle deploying the bridges using mechanical handling device. Figure 5: shows the perspective view of the mounting assembly. Figure 6: shows the eccentric loading condition on the bridge system. DETAILED DESCRIPTION OF THE INVENTION The present invention is in relation to a bridging system comprises; main deck (1) at top with plurality of" longitudinal girders (2) and a cross girder (3) at bottom, and folding decks (4) hinged to the main deck (1) on either sides. In yet another embodiment of the present invention the bridge system is made of aluminium, preferably aluminium alloy RDE-40. In still another embodiment of the present invention the bridge system has length of about 5 m, width of about 3.5 m in transportation mode and of about 4.0 m in deployed condition. In still another embodiment of the present invention the bridge system is placed onto mounting assembly (9) of carrier vehicle (5). In still another embodiment of the present invention the bridge system has load bearing capacity of up to 70 tons. In still another embodiment of the present invention the mounting assembly (9) is a structural member fabricated out of steel plate, preferably High Strength Low Alloy steel (HSLA), to bear and transfer load of mechanical handling device (6) onto chassis (9b) of the carrier vehicle (5). In still another embodiment of the present invention the carrier vehicle (5) is preferably TATRA vehicle, wherein the chassis is extended in length to about 0.85 m to form the mounting assembly (9) for mechanical handling device (6). In still another embodiment of the present invention the mechanical handling device (6) lifts the bridge system and is operated manually for deployment. The present invention is in relation to a method of operation for deployment of bridge system comprises acts of: spreading outriggers (5a) of carrier vehicle (5), positioning crane lock (8) to lock with lifting beam (6a) of mechanical handling device (6) for lifting the bridge system, and placing the bridge system onto gap for deployment. In still another embodiment of the present invention the outriggers (5a) supports carrier vehicle (5) during deployment of the bridge system. In still another embodiment of the present invention the mechanical handling device (6) lifts the bridge system and is operated manually for the deployment. The present invention is in relation to a method of assembling bridging system comprises acts of: mounting bridge system onto carrier vehicle (5), and installing mechanical handling device (6) onto mounting assembly (9) of the carrier vehicle (5) for deployment of the bridging system. The bridging system is of 5m short span consists of a Tatra 6x6 chassis as a carrier vehicle (5), over which two numbers of 5m long bridge superstructure in RDE-40 aluminium alloy / steel are stacked one above the other (figure 4). An articulation type mechanical handling device (6) to handle the bridges during deployment is also mounted at the rear of the vehicle. During transportation, the mechanical handling device (6) will be folded towards the side of the system. The bridge superstructure as shown in figure 1 (a) and (b), is 5m long and 4m wide and is designed for MLC-70 load. Bridge superstructure comprises of main deck (1) at top with supporting cross girder (3) and channel (3a). The bridges are folded at side ends using folding decks (4) along with longitudinal girders (2). The bridge is designed in light weight aluminum alloy RDE-40 and it is a fully decked. The width of the bridge is 3.5 m in transportation mode and 4m in deployed condition. The change in width is achieved by two folding decks (4). Provision for self illuminating beta lights is provided on the bridge superstructure for night operation. Total weight of the bridge achieved is 1.6 tons. The density of aluminum is one-third that of steel. The strength to weight ratio of aluminum is higher than that of steel. The bridges with light weight are of primary consideration, as they are required to be mechanically launched within a very small time frame. Hence, the bridge is designed in aluminum alloy RDE-40. The bridge is laid in very harsh environmental conditions and hence the material aluminum is chosen because of its corrosion resistance properties. RDE-40 is a special type of aluminum alloy with zinc and magnesium as its primary alloying elements, whereas the zinc contributes to strength factor, magnesium and other elements in order to increase the corrosion resistance of the metal. The numerical value 40 stands for the ultimate tensile strength of the alloy i.e. 40 kg/mm2.The chemical and mechanical properties of the alloy are given below. Chemical properties: (Table Removed) The width of the bridge in transportation mode is 3.5 m and in deployed condition it is 4.0 m. This is achieved with the help of two folding decks (4) which are manually operated. The folding deck (4) is hinged to the main deck (1) at four points on either side as shown in figure 2 (c). Figure 2(a) and 2(b) illustrates the front and side view of the bridging system. Since, the bridge is manufactured in light weight aluminum; these folding decks (4) are easily lifted by two persons and are opened out after deployment of the bridge. In any areas of urgency where gaps of 4.5 m or below is encountered, this bridge can be laid down within a matter of minutes. This bridge also laid down in marshy areas or used as in ramp mode for high bank crossing. Figure 5 illustrates that vehicle chassis (9b) has been modified to mount the mechanical handling device (6) at rear end of the vehicle. The mounting assembly (9) basically consists of chassis extension (9c) and top beam (9a). It is a structural member fabricated out of HSLA steel plate to bear and transfer the loads of handling device on to the chassis. The scope of the development of 5 m bridging system includes development of fully decked, light weight aluminum bridges of 5 m length and 4 m total roadway width in deployed condition. The top of the deck have anti-skid surface. The bridges have self illuminating lights mounted on it for night visibility. The bridges have a load classification of MLC-70. Two such bridges are mounted one above the other on a TATRA 6x 6 vehicle as shown in figure 4 (a) and 4 (b). The bridges are mechanically launched with the help of a suitable mechanical handling device (6) mounted on the vehicle itself as shown in figure 3. Figure 6 illustrates the eccentric loading condition on the bridge system, in order to find out the loading condition on the bridge, eccentric loading condition has been taken. Under this condition one track is at the edge of the bridge and the load distribution factors are obtained. In this system, the mechanical handling device (6) is a vehicle mounted hydraulically operated crane of 15.5 ton-m. As it is mounted on vehicle, the main restriction was that the height is limited to specified limit of overall height, width and length during road and rail transportability. Specifications of Mechanical Handling Device: Mechanical handling Device (6) has engineered for the short span bridge application. Hydraulic system for Mechanical handling Device (6) has a wireless remote control with digital display of all load parameters. Power for the operation of mechanical handling device (6) is tapped from vehicle. In order to handle emergency situation, in case of power failure, separate stand-by system is made available for non interrupted use of the system Capacity of the mechanical handling device Maximum lifting capacity Slewing range Folded height Max Width when stabilizer is spread Min Width when stabilizer is closed Max Height from ground during transportation Max operating pressure 16 ton-m 2.9 ton @ 5.5m 360° + 30° 3.7m (max) 200-250 bar rhe buckling check of the longitudinal girders (2) was done and optimum number of stiffeners is planned. After laying the bridge, the end ramps are fitted separately. The bridge has inbuilt end ramps. The slope of the end ramp portion of the bridge is a comfortable one for the vehicles to climb on the bridge. This bridge can be laid in less than 5 minutes and directly used for gap crossing without any ground preparations. We claim: 1. A bridging system comprises; a. main deck (1) at top with plurality of longitudinal girders (2) and a cross girder (3) at bottom, and b. folding decks (4) hinged to the main deck (1) on either sides. 2. The bridging system as claimed in claim 1, wherein the bridge system is made of aluminium, preferably aluminium alloy RDE-40. 3. The bridging system as claimed in claim 1, wherein the bridge system has length of about 5 m, width of about 3.5 m in transportation mode and of about 4.0 m in deployed condition. 4. 'The bridging system as claimed in claim 1, wherein the bridge system is placed onto mounting assembly (9) of carrier vehicle (5). 5. The bridging system as claimed in claim 1, wherein the bridge system has load bearing capacity of up to 70 tons. 6. The bridging system as claimed in claim 4, wherein the mounting assembly is a structural member fabricated out of steel plate, preferably High Strength Low Alloy steel (HSLA), to bear and transfer load of mechanical handling device (6) onto chassis of the carrier vehicle (5). 7. The bridging system as claimed in claim 4, wherein the carrier vehicle (5) is preferably TATRA vehicle, wherein the chassis is extended in length to about 0.85 m to form the mounting assembly (9) for mechanical handling device (6). 8. The bridging system as claimed in claim 6, wherein the mechanical handling device (6) lifts the bridge system and is operated manually for deployment. 9. A method of operation for deployment of bridge system comprises acts of a. spreading outriggers (5a) of carrier vehicle (5), b. positioning crane lock (8) to lock with lilting beam (6a) of mechanical handling device (6) for lifting the bridge system, and c. placing the bridge system onto gap for deployment. 10. The method as claimed in claim 9, wherein the outriggers (5a) supports carrier vehicle (5) during deployment of the bridge system. 11. The method as claimed in claim 9, wherein the mechanical handling device (6) lifts the bridge system and is operated manually for the deployment. 12. A method of assembling bridging system comprises acts of a. mounting bridge system onto carrier vehicle (5), and b. installing mechanical handling device (6) onto mounting assembly (9) of the carrier vehicle (5) for deployment of the bridging system. 13. A bridging system, method of operation and method of assembling of as herein described in the description and substantiated along with drawings.

Full Text

FIELD OF THE INVENTION
The present invention relates to bridges, more particularly the present invention relates to bridging system to cross small gaps and canals. The bridges are carried on a vehicle having mechanical handling device. The mechanical handling device deploys the bridges onto the small gaps and canals.
BACKGROUND OF THE INVENTION
In the existing bridges the major challenges and constraints were the availability of space over the chassis of the carrier vehicle to place the bridges, the mechanical handling assembly and departure angle of the vehicle, which is critical for cross country mobility. Cross country mobility of a vehicle is termed as the mobility of the vehicle in an area where no proper road conditions exist. No proper road condition refers to an area where bumps, ditches, dunes and all sorts of uneven surfaces exist.
The bridges used in existing trends have greater span lengths. These bridges having long span were not useful in bridging small gaps and canals. The need for developing the short span bridges compatible to that of large span bridges in all aspects was major challenge.
On the vehicle carrying the bridges there was no space to mount the mechanical handling assembly directly onto the chassis, since platform length of carrier vehicle (TATRA 6 x 6) was limited.
OBJECTS OF THE INVENTION
The principal object of the present invention is to develop a bridging system for small gaps and canals.
Yet another object of the invention is to develop bridge system has length of about 5 m, width of about 3.5 m in transportation mode and of about 4.0 m in deployed condition.
Yet another object of the invention is to develop a method of operation for deployment of bridge system.
Yet another object of the invention is to develop a method of assembling bridging system.
STATEMENT OF INVENTION
Accordingly the invention provides for a bridging system comprises: main deck (1) at top with plurality of longitudinal girders (2) and a cross girder (3) at bottom, and folding decks (4) hinged to the main deck (1) on either sides; a method of operation for deployment of bridge system comprises acts of: spreading outriggers (5a) of carrier vehicle (5), positioning crane lock (8) to lock with lifting beam (6a) of mechanical handling device (6) for lifting the bridge system, and placing the bridge system onto gap for deployment; a method of assembling bridging system comprises acts of: mounting bridge system onto carrier vehicle (5), and installing mechanical handling device (6) onto mounting assembly (9) of the carrier vehicle (5) for deployment of the bridging system.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
Figure l(a) and (b): shows the perspective view of the bridge system.
Figure 2 (a): shows the front view of the bridge system.
Figure 2 (b): shows the side view of the bridge system.
Figure 2 (c): shows the top view of the bridge system.
Figure 3: shows the perspective view of the carrier vehicle with the mounting assembly
and the mechanical handling device in unloaded condition.
Figure 4 (a): shows the perspective view of the carrier vehicle with the mounting
assembly and the mechanical handling device in loaded condition.
Figure 4 (b): shows the perspective of the carrier vehicle deploying the bridges using
mechanical handling device.
Figure 5: shows the perspective view of the mounting assembly.
Figure 6: shows the eccentric loading condition on the bridge system.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is in relation to a bridging system comprises; main deck (1) at top with plurality of" longitudinal girders (2) and a cross girder (3) at bottom, and folding decks (4) hinged to the main deck (1) on either sides.
In yet another embodiment of the present invention the bridge system is made of aluminium, preferably aluminium alloy RDE-40.
In still another embodiment of the present invention the bridge system has length of about 5 m, width of about 3.5 m in transportation mode and of about 4.0 m in deployed condition.
In still another embodiment of the present invention the bridge system is placed onto mounting assembly (9) of carrier vehicle (5).
In still another embodiment of the present invention the bridge system has load bearing capacity of up to 70 tons.
In still another embodiment of the present invention the mounting assembly (9) is a structural member fabricated out of steel plate, preferably High Strength Low Alloy steel (HSLA), to bear and transfer load of mechanical handling device (6) onto chassis (9b) of the carrier vehicle (5).
In still another embodiment of the present invention the carrier vehicle (5) is preferably TATRA vehicle, wherein the chassis is extended in length to about 0.85 m to form the mounting assembly (9) for mechanical handling device (6).
In still another embodiment of the present invention the mechanical handling device (6) lifts the bridge system and is operated manually for deployment.
The present invention is in relation to a method of operation for deployment of bridge system comprises acts of: spreading outriggers (5a) of carrier vehicle (5), positioning
crane lock (8) to lock with lifting beam (6a) of mechanical handling device (6) for lifting the bridge system, and placing the bridge system onto gap for deployment.
In still another embodiment of the present invention the outriggers (5a) supports carrier vehicle (5) during deployment of the bridge system.
In still another embodiment of the present invention the mechanical handling device (6) lifts the bridge system and is operated manually for the deployment.
The present invention is in relation to a method of assembling bridging system comprises acts of: mounting bridge system onto carrier vehicle (5), and installing mechanical handling device (6) onto mounting assembly (9) of the carrier vehicle (5) for deployment of the bridging system.
The bridging system is of 5m short span consists of a Tatra 6x6 chassis as a carrier vehicle (5), over which two numbers of 5m long bridge superstructure in RDE-40 aluminium alloy / steel are stacked one above the other (figure 4). An articulation type mechanical handling device (6) to handle the bridges during deployment is also mounted at the rear of the vehicle. During transportation, the mechanical handling device (6) will be folded towards the side of the system.
The bridge superstructure as shown in figure 1 (a) and (b), is 5m long and 4m wide and is designed for MLC-70 load. Bridge superstructure comprises of main deck (1) at top with supporting cross girder (3) and channel (3a). The bridges are folded at side ends using folding decks (4) along with longitudinal girders (2). The bridge is designed in light weight aluminum alloy RDE-40 and it is a fully decked. The width of the bridge is 3.5 m in transportation mode and 4m in deployed condition. The change in width is achieved by two folding decks (4). Provision for self illuminating beta lights is provided on the bridge superstructure for night operation. Total weight of the bridge achieved is 1.6 tons.
The density of aluminum is one-third that of steel. The strength to weight ratio of aluminum is higher than that of steel. The bridges with light weight are of primary consideration, as they are required to be mechanically launched within a very small time
frame. Hence, the bridge is designed in aluminum alloy RDE-40. The bridge is laid in very harsh environmental conditions and hence the material aluminum is chosen because of its corrosion resistance properties.
RDE-40 is a special type of aluminum alloy with zinc and magnesium as its primary alloying elements, whereas the zinc contributes to strength factor, magnesium and other elements in order to increase the corrosion resistance of the metal.
The numerical value 40 stands for the ultimate tensile strength of the alloy i.e. 40 kg/mm2.The chemical and mechanical properties of the alloy are given below.
Chemical properties:
(Table Removed)
The width of the bridge in transportation mode is 3.5 m and in deployed condition it is 4.0 m. This is achieved with the help of two folding decks (4) which are manually operated. The folding deck (4) is hinged to the main deck (1) at four points on either side as shown in figure 2 (c). Figure 2(a) and 2(b) illustrates the front and side view of the bridging system. Since, the bridge is manufactured in light weight aluminum; these folding decks (4) are easily lifted by two persons and are opened out after deployment of the bridge.
In any areas of urgency where gaps of 4.5 m or below is encountered, this bridge can be laid down within a matter of minutes. This bridge also laid down in marshy areas or used
as in ramp mode for high bank crossing.
Figure 5 illustrates that vehicle chassis (9b) has been modified to mount the mechanical handling device (6) at rear end of the vehicle. The mounting assembly (9) basically consists of chassis extension (9c) and top beam (9a). It is a structural member fabricated out of HSLA steel plate to bear and transfer the loads of handling device on to the chassis.
The scope of the development of 5 m bridging system includes development of fully decked, light weight aluminum bridges of 5 m length and 4 m total roadway width in deployed condition. The top of the deck have anti-skid surface. The bridges have self illuminating lights mounted on it for night visibility. The bridges have a load classification of MLC-70. Two such bridges are mounted one above the other on a TATRA 6x 6 vehicle as shown in figure 4 (a) and 4 (b). The bridges are mechanically launched with the help of a suitable mechanical handling device (6) mounted on the vehicle itself as shown in figure 3.
Figure 6 illustrates the eccentric loading condition on the bridge system, in order to find out the loading condition on the bridge, eccentric loading condition has been taken. Under this condition one track is at the edge of the bridge and the load distribution factors are obtained.
In this system, the mechanical handling device (6) is a vehicle mounted hydraulically operated crane of 15.5 ton-m. As it is mounted on vehicle, the main restriction was that the height is limited to specified limit of overall height, width and length during road and rail transportability.
Specifications of Mechanical Handling Device:
Mechanical handling Device (6) has engineered for the short span bridge application. Hydraulic system for Mechanical handling Device (6) has a wireless remote control with digital display of all load parameters. Power for the operation of mechanical handling device (6) is tapped from vehicle. In order to handle emergency situation, in case of
power failure, separate stand-by system is made available for non interrupted use of the system

Capacity of the mechanical handling device
Maximum lifting capacity
Slewing range
Folded height
Max Width when stabilizer is spread
Min Width when stabilizer is closed
Max Height from ground during transportation
Max operating pressure

16 ton-m 2.9 ton @ 5.5m 360° + 30° 3.7m (max) 200-250 bar

rhe buckling check of the longitudinal girders (2) was done and optimum number of stiffeners is planned. After laying the bridge, the end ramps are fitted separately.
The bridge has inbuilt end ramps. The slope of the end ramp portion of the bridge is a comfortable one for the vehicles to climb on the bridge. This bridge can be laid in less than 5 minutes and directly used for gap crossing without any ground preparations.

We claim:
1. A bridging system comprises;
a. main deck (1) at top with plurality of longitudinal girders (2) and a cross girder
(3) at bottom, and
b. folding decks (4) hinged to the main deck (1) on either sides.
2. The bridging system as claimed in claim 1, wherein the bridge system is made of
aluminium, preferably aluminium alloy RDE-40.
3. The bridging system as claimed in claim 1, wherein the bridge system has length of
about 5 m, width of about 3.5 m in transportation mode and of about 4.0 m in
deployed condition.
4. 'The bridging system as claimed in claim 1, wherein the bridge system is placed onto
mounting assembly (9) of carrier vehicle (5).
5. The bridging system as claimed in claim 1, wherein the bridge system has load
bearing capacity of up to 70 tons.
6. The bridging system as claimed in claim 4, wherein the mounting assembly is a
structural member fabricated out of steel plate, preferably High Strength Low Alloy
steel (HSLA), to bear and transfer load of mechanical handling device (6) onto
chassis of the carrier vehicle (5).
7. The bridging system as claimed in claim 4, wherein the carrier vehicle (5) is
preferably TATRA vehicle, wherein the chassis is extended in length to about 0.85 m
to form the mounting assembly (9) for mechanical handling device (6).
8. The bridging system as claimed in claim 6, wherein the mechanical handling device
(6) lifts the bridge system and is operated manually for deployment.
9. A method of operation for deployment of bridge system comprises acts of
a. spreading outriggers (5a) of carrier vehicle (5),
b. positioning crane lock (8) to lock with lilting beam (6a) of mechanical handling
device (6) for lifting the bridge system, and
c. placing the bridge system onto gap for deployment.
10. The method as claimed in claim 9, wherein the outriggers (5a) supports carrier
vehicle (5) during deployment of the bridge system.
11. The method as claimed in claim 9, wherein the mechanical handling device (6) lifts
the bridge system and is operated manually for the deployment.
12. A method of assembling bridging system comprises acts of
a. mounting bridge system onto carrier vehicle (5), and
b. installing mechanical handling device (6) onto mounting assembly (9) of the
carrier vehicle (5) for deployment of the bridging system.
13. A bridging system, method of operation and method of assembling of as herein
described in the description and substantiated along with drawings.

Documents:

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Patent Number

276962

Indian Patent Application Number

885/DEL/2008

PG Journal Number

47/2016

Publication Date

11-Nov-2016

Grant Date

07-Nov-2016

Date of Filing

03-Apr-2008

Name of Patentee

DIRECTOR GENERAL, DEFENCE RESEARCH AND DEVELOPMENT ORGANISATION[DRDO]

Applicant Address

MINISTRY OF DEFENCE, GOVT. OF INDIA, ROOM NO. 348, B-WING, DRDO BHAWAN RAJAJI MARG, NEW DELHI-110011, INDIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	AZHAKAPRAKALAM SIVANANDAN	THE DIRECTOR, DEFENCE RESEARCH & DEVELOPMENT ESTT.(ENGRS.) ALANDI ROAD, DIGHI PUNE-411015
2	NAWAL KISHOR CHAUDHARY, CHITRALEKHA DEY	THE DIRECTOR, DEFENCE RESEARCH & DEVELOPMENT ESTT.(ENGRS.) ALANDI ROAD, DIGHI PUNE-411015
3	UDAY SHANKAR ROY	THE DIRECTOR, DEFENCE RESEARCH & DEVELOPMENT ESTT.(ENGRS.) ALANDI ROAD, DIGHI PUNE-411015

PCT International Classification Number

E01D

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA