CN203509357U - Laser welding clamp with automatic correction function - Google Patents
Laser welding clamp with automatic correction function Download PDFInfo
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- CN203509357U CN203509357U CN201320459458.4U CN201320459458U CN203509357U CN 203509357 U CN203509357 U CN 203509357U CN 201320459458 U CN201320459458 U CN 201320459458U CN 203509357 U CN203509357 U CN 203509357U
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- clamping
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Abstract
A laser welding clamp with an automatic correction function is characterized in that a material grabbing and releasing mechanism comprises a main lifting rotating transmission part, a cantilever, a first mechanical arm and a second mechanical arm, the correction positioning mechanism comprises a double-station rotating mechanism, a guiding clamping mechanism and a correction abutting rotating mechanism, the double-station rotating mechanism comprises a double-station rotating motor combination, a fixed connecting plate, a double-station indexing rotating disc, a first rotating sliding combination and a second rotating sliding combination, the guiding clamping mechanism comprises a first clamping combination and a second clamping combination, and the correction abutting rotating mechanism comprises an upward abutting air cylinder, a battery rotating motor combination to be welded, a suction opening, a double-angle correction combination, a baffle, a long-side correction combination, a connecting plate and a buffer block. By means of the laser welding clamp, materials can be automatically grabbed and released, automatic positioning and automatic correction are achieved, double-station rotating is achieved, materials are released while welding is conducted, efficiency is improved, manpower is saved, the operation difficulty is lowered, the safety degree is improved, and the laser welding clamp is suitable for welding top covers of various power batteries and other square batteries.
Description
Technical field
The utility model relates to fixture, particularly relates to a kind of fixture for laser welding with zero offset capability.
Background technology
The existing fixture for square shell electrokinetic cell top cover laser weld, comprises for the front and back push-tight cylinder of battery fore-and-aft direction to be welded push-tight and connecting plate thereof, for the location-plate of battery to be welded location and the upper-lower compacting cylinder compressing for battery above-below direction to be welded.In whole laser beam welding, need artificial blowing, manually transposition and artificial feeding.Welding process is as follows: unclamp-artificial transposition-front and back push-tight cylinder of the long limit-front and back push-tight cylinder of artificial blowing-front and back push-tight cylinder and upper-lower compacting cylinder-pressing-welding and upper-lower compacting cylinder and upper-lower compacting cylinder-pressing-weld be in another long limit-artificial another groove of blowing-weld the feeding of minor face-another minor face that manually replaces-weld-manually.Because this fixture for laser welding is without zero offset capability, its operating process is loaded down with trivial details, waste of manpower, and welding efficiency is low, and degree of safety is poor.
Summary of the invention
Technical problem to be solved in the utility model is the defect that makes up above-mentioned prior art, and a kind of fixture for laser welding with zero offset capability is provided.
Technical problem of the present utility model is solved by the following technical programs.
This fixture for laser welding with zero offset capability, comprising:
Material grasping discharge mechanism, puts into the pallet of loading station and pipeline for capturing battery to be welded,
Be positioned at the correction locating mechanism under described material grasping discharge mechanism, be used for battery rotary to be welded to proofreading and correct position, proofread and correct battery container and top cover relative position, hold out against fixing battery to be welded, and by the long limit of battery to be welded and minor face rotation transformation position.
This feature with the fixture for laser welding of zero offset capability is:
Described material grasping discharge mechanism comprises:
The main lifting rotation drive disk assembly being formed by main lift cylinder, main lift cylinder connector, rotary cylinder and rotary cylinder adaptor;
Be connected by screw the cantilever of fixing main lifting rotation drive disk assembly;
By the first secondary lift cylinder, the first secondary lift cylinder connector, refer to for capturing and send into the first gas pawl and the first gas cleft hand of battery to be welded the first manipulator forming;
By the second secondary lift cylinder, the second secondary lift cylinder connector, refer to for capturing and send into the second gas pawl and the second gas cleft hand of battery to be welded the second manipulator forming;
Described the first manipulator and the second manipulator are arranged on main lifting rotation drive disk assembly both sides, by described main lifting rotation drive disk assembly transmission lifting simultaneously and rotation interchangeable position, and described main lifting rotation drive disk assembly, described the first manipulator and the second manipulator independently move according to setting program separately.
The course of action of described material grasping discharge mechanism is as follows:
Main lift cylinder is released the-first manipulator downwards, the second manipulator-first gas pawl that simultaneously declines, the second gas pawl is released the-the first gas cleft hand and is referred to, the second gas cleft hand refers to open respectively the-first secondary lift cylinder, the second secondary lift cylinder is released the-first gas pawl downwards, second gas pawl retraction the-the first gas pawl, the second gas pawl clamps respectively the secondary lift cylinder of battery-the first to be welded, the second upwards mention-rotary cylinder of secondary lift cylinder 180 ° of-first secondary lift cylinders that turn clockwise, the second secondary lift cylinder is released the-first gas pawl downwards, the second gas pawl is released the-the first gas cleft hand and is referred to, the second gas cleft hand refers to open respectively-complete material grasping and blowing simultaneously.
Described correction locating mechanism comprises that double rotating mechanism, guiding clamping mechanism and correction hold out against rotating mechanism.
Described double rotating mechanism comprises:
By turntable, rotate platen and provide the double electric rotating machine that the double electric rotating machine with decelerator of rotary power forms to combine;
For the fixed connecting plate that fixedly double electric rotating machine combines;
Two station indexing rotary tables, described two station indexing rotary tables are fixed in electric rotating machine combination;
The first rotational slide being comprised of the first slide rail and clutch shaft bearing is combined, and described the first rotational slide combination is fixedly mounted on described two station indexing rotary tables;
The second rotational slide being comprised of the second slide rail and the second bearing is combined, and described the second rotational slide combination is fixedly mounted on described two station indexing rotary tables;
Described the first rotational slide combination and the second rotational slide combined and alternatively Rotate 180 ° are driven by described double electric rotating machine.
Described guiding clamping mechanism comprises:
The the first clamping combination being formed by the first Pneumatic connecting rod combination, the first roller combination and the first connecting support seat, described first clamps combination is fixed in the first rotational slide combination, described first clamps combination oscilaltion and rotatablely moves by described the first rotational slide combination transmission, described the first Pneumatic connecting rod combination by the first clamp, first connecting rod mechanism, moving up and down drives the first clamping cylinder and the first clamping cylinder seat of the work of first connecting rod mechanism to form, for clamping and unclamping tight battery to be welded;
The the second clamping combination being formed by the second Pneumatic connecting rod combination, the second roller combination and the second connecting support seat, described second clamps combination is fixed in the second rotational slide combination, described second clamps combination oscilaltion and rotatablely moves by described the second rotational slide combination transmission, described the second Pneumatic connecting rod combination by the second clamp, second connecting rod mechanism, moving up and down drives the second clamping cylinder and the second clamping cylinder seat of the work of second connecting rod mechanism to form, for clamping and unclamping tight battery to be welded;
Described correction holds out against rotating mechanism and comprises:
Upwards hold out against cylinder, for upwards withstanding the bearing of described the first rotational slide combination or the second rotational slide combination;
The battery rotary motor combination to be welded being comprised of battery rotary motor to be welded, battery rotary motor fixing seat to be welded and battery rotary motor connector to be welded, provides rotary power while alternately welding for the long limit of battery to be welded and minor face;
Suction opeing, as the interface of absorbing smoke dust;
Proofread and correct combination for two jiaos that by correction cylinder and slide rail, are formed, for two jiaos of battery container to be welded and top covers are coincide;
Baffle plate, for avoiding damage from laser location built-up section;
By cylinder connecting plate, proofread and correct long limit that cylinder, correcting block form and proofread and correct and combine, for making battery container to be welded and top cover grow the limit corrective action of having coincide, when itself and two jiaos of correction group contracts, work;
Connecting plate, for being fixedly connected with cylinder connecting plate and two jiaos of slide rails of proofreading and correct in combination of battery rotary motor fixing seat to be welded, the correction combination of long limit;
And
Be fixed on the buffer stopper in battery rotary motor combination to be welded, for cushion two jiaos proofread and correct cylinders and long limit proofread and correct cylinder piston continue stretch out.
The course of action of described correction locating mechanism is as follows:
1) double rotation
Starting the first rotational slide combination, first on two station rotary motor combination-two station indexing rotary tables clamps combination and the second rotational slide combination, second and clamps combination clockwise 180 ° of transpositions-guiding clamping mechanism delivered to by battery to be welded and correction holds out against rotating mechanism;
2) guiding clamping and correction hold out against rotation
Combination is proofreaied and correct on long limit, push-tight battery container to be welded and top cover during two jiaos of correction group contracts-upwards hold out against cylinder jack-up-the first clamping cylinder that makes progress, the second clamping cylinder rises simultaneously-passes through respectively first connecting rod mechanism, second connecting rod mechanism holds battery container-length to be welded limit tightly and proofreaies and correct combination, during two jiaos of correction group contracts, unclamping the long limit of battery container to be welded and top cover-beginning laser weld article one-start battery rotary motor-the first to be welded clamps combination and turns clockwise 90 °, second do not rotate-laser weld of clamping combination article one minor face-start battery rotary motor-the first clamping combination to be welded to turn clockwise 90 °, the second long limit of do not rotate-laser weld of clamping combination second-start battery rotary motor-the first clamping combination to be welded to be rotated counterclockwise 270 °, second clamps do not rotate-laser weld of combination second minor face,
3) double rotation again
Again start on two station rotary motor combination-two station indexing rotary tables the first rotational slide combination, first and clamp combination and the second rotational slide combination, second and clamp counterclockwise 180 ° of transpositions of combination-welded battery to treat that material grasping discharge mechanism takes out, will not weld battery simultaneously and put into the first clamping combination;
4) guiding clamping and correction hold out against rotation
Combination is proofreaied and correct on long limit, push-tight battery container to be welded and top cover during two jiaos of correction group contracts-upwards hold out against cylinder jack-up-the first clamping cylinder that makes progress, the second clamping cylinder rises simultaneously-passes through respectively first connecting rod mechanism, second connecting rod mechanism holds battery container-length to be welded limit tightly and proofreaies and correct combination, during two jiaos of correction group contracts, unclamping the long limit of battery container to be welded and top cover-beginning laser weld article one-start battery rotary motor-the second to be welded clamps combination and turns clockwise 90 °, first do not rotate-laser weld of clamping combination article one minor face-start battery rotary motor-the second clamping combination to be welded to turn clockwise 90 °, the first long limit of do not rotate-laser weld of clamping combination second-start battery rotary motor-the second clamping combination to be welded to be rotated counterclockwise 270 °, first clamps do not rotate-laser weld of combination second minor face.
The utility model beneficial effect is compared with prior art:
Automatically material grasping blowing, positioning correcting automatically, double rotation, limit blowing side weld connects, and raises the efficiency, and saves manpower, alleviates operation easier, improves degree of safety.The utility model is applicable to the electrokinetic cell of various models and the welding of the top cover of other rectangular cells.
Accompanying drawing explanation
Fig. 1 is the composition structural perspective of the utility model specific embodiment;
Fig. 2 is the composition structural perspective at another visual angle of Fig. 1;
Fig. 3 is the two large disintegration schematic diagrames that form mechanism of Fig. 1;
Fig. 4 is the disintegration schematic diagram of the material grasping discharge mechanism 1 in Fig. 3;
Fig. 5 is the disintegration schematic diagram of the main lifting rotation running part 4 in Fig. 4;
Fig. 6 is the disintegration schematic diagram of the first manipulator 5 in Fig. 4;
Fig. 7 is the disintegration schematic diagram of the guiding clamping mechanism of correction locating mechanism and a part for double rotating mechanism;
Fig. 8 is the disintegration schematic diagram of the first clamping combination 20 of the guiding clamping mechanism in Fig. 7;
Fig. 9 is the disintegration schematic diagram of the first Pneumatic connecting rod combination 33 in Fig. 8;
Figure 10 is another part of double rotating mechanism and proofreaies and correct the disintegration schematic diagram of a part that holds out against rotating mechanism;
Figure 11 is the disintegration schematic diagram of proofreading and correct the another part that holds out against rotating mechanism; ;
Figure 12 is the disintegration schematic diagram of the motor combination 10 in Figure 11.
The specific embodiment
Below in conjunction with the specific embodiment and contrast accompanying drawing the utility model is described.
The fixture for laser welding with zero offset capability of this specific embodiment, as shown in Fig. 1～12, is the square shell electrokinetic cell top cover that the 2kw optical fiber laser welded case material of YLS-2000 is aluminium alloy for adopting model.
This specific embodiment comprises:
Material grasping discharge mechanism 1, puts into the pallet of loading station and pipeline for capturing battery to be welded;
Be positioned at the correction locating mechanism 2 under described material grasping discharge mechanism, be used for battery rotary to be welded to proofreading and correct position, proofread and correct battery container and top cover relative position, hold out against fixing battery to be welded, and by the long limit of battery to be welded and minor face rotation transformation position.
Wherein material grasping discharge mechanism 1 comprises:
The main lifting rotation drive disk assembly 4 being formed by main lift cylinder 22, main lift cylinder connector 23, rotary cylinder 24 and rotary cylinder adaptor 25;
Be connected by screw the cantilever 3 of fixing main lifting rotation drive disk assembly 4;
By the secondary lift cylinder connector 27 of the first secondary lift cylinder 26, first, refer to 29 the first manipulators 5 that form for capturing and send into the first gas pawl 28 and the first gas cleft hand of battery to be welded;
By the second secondary lift cylinder, the second secondary lift cylinder connector, refer to for capturing and send into the second gas pawl and the second gas cleft hand of battery to be welded the second manipulator 6 forming;
The first manipulator 5 and the second manipulator 6 are arranged on main lifting rotation drive disk assembly 4 both sides, by main lifting rotation drive disk assembly 4 transmissions lifting simultaneously and rotation interchangeable position, and main lifting rotation drive disk assembly 4, the first manipulator 5 and the second manipulator 6 independently move according to setting program separately.
The course of action of material grasping discharge mechanism 1 is as follows:
Wherein correction locating mechanism 2 comprises that double rotating mechanism, guiding clamping mechanism and correction hold out against rotating mechanism.
Double rotating mechanism comprises:
By turntable, the double electric rotating machine combination 9 of rotating platen and providing the double electric rotating machine with decelerator of rotary power to form;
Be used for the fixedly fixed connecting plate 7 of double electric rotating machine combination 9;
Be fixed on two station indexing rotary tables 17 in electric rotating machine combination 9;
Be fixedly mounted on the first rotational slide combination 18 forming on two station indexing rotary tables 17, by the first slide rail and clutch shaft bearing;
Be fixedly mounted on the second rotational slide combination 19 forming on two station indexing rotary tables 17, by the second slide rail and the second bearing;
First rotational slide combination the 18 and second rotational slide combination 19 alternately Rotate 180 ° is driven by double electric rotating machine.
Guiding clamping mechanism comprises:
The the first clamping combination 20 being formed by first Pneumatic connecting rod combination 33, first roller combination the 34 and first connecting support seat 35, first clamps combination 20 is fixed in the first rotational slide combination 18, the first clamping is combined 18 oscilaltions and is rotatablely moved and combines 18 transmissions by the first rotational slide, the first Pneumatic connecting rod combination 33 by the first clamp 36, first connecting rod mechanism 37, moving up and down drives the first clamping cylinder 38 and the first clamping cylinder seats 39 of 37 work of first connecting rod mechanism to form, for clamping and unclamping tight battery to be welded;
The the second clamping combination 21 being formed by the second Pneumatic connecting rod combination, the second roller combination and the second connecting support seat, second clamps combination 21 is fixed in the second rotational slide combination 19, the second clamping is combined 19 oscilaltions and is rotatablely moved and combines 19 transmissions by the second rotational slide, the second Pneumatic connecting rod combination by the second clamp, second connecting rod mechanism, moving up and down drives the second clamping cylinder and the second clamping cylinder seat of the work of second connecting rod mechanism to form, for clamping and unclamping tight battery to be welded.
Correction holds out against rotating mechanism and comprises:
Upwards hold out against cylinder 8, for upwards withstanding the bearing of first rotational slide combination the 18 or second rotational slide combination 19;
The battery rotary motor combination 10 to be welded being comprised of battery rotary motor 31 to be welded, battery rotary motor fixing seat 32 to be welded and battery rotary motor connector 30 to be welded, provides rotary power while alternately welding for the long limit of battery to be welded and minor face;
Suction opeing 11, as the interface of absorbing smoke dust;
Proofread and correct combination 14 for two jiaos that by two jiaos of correction cylinders and slide rail, are formed, for two jiaos of battery container to be welded and top covers are coincide;
By cylinder connecting plate, long limit, proofread and correct long limit that cylinder, correcting block form and proofread and correct and combine 16, for making battery container to be welded and the top cover length limit corrective action of having coincide, when itself and two jiaos of correction group contracts, work;
Connecting plate 12, for being fixedly connected with cylinder connecting plate and two jiaos of slide rails of proofreading and correct in combination 14 of battery rotary motor fixing seat 32 to be welded, long limit correction combination 16;
And
Be fixed on the buffer stopper 13 in battery rotary motor combination 10 to be welded, for cushion two jiaos proofread and correct cylinders and long limit proofread and correct cylinder piston continue stretch out.
The course of action of correction locating mechanism 2 is as follows:
1) double rotation
Starting the first rotational slide combination 18, first on two station rotary motor combination 9-two station indexing rotary tables 17 clamps combination the 20 and second rotational slide combination 19, second and clamps and combine 21 clockwise 180 ° of transpositions-guiding clamping mechanism delivered to by battery to be welded and correction holds out against rotating mechanism;
2) guiding clamping and correction hold out against rotation
3) double rotation again
On two station rotary motor combination 9-two station indexing rotary tables 17, the first rotational slide combination 18, first clamps combination the 20 and second rotational slide combination 19, second and clamps combination 21 counterclockwise 180 ° of transpositions-welded battery to treat that material grasping discharge mechanism takes out again, will not weld battery simultaneously and puts into the first clamping and combine;
4) guiding clamping and correction hold out against rotation
The welded section of side's shell electrokinetic cell roof side weldering is 135 * 33mm, is once soldered successively by the first long limit at battery cap to be welded edge, the first minor face, the second long limit, the second minor face, and the total time from material grasping to blowing is calculated as follows:
Welding girth: (139+33) * 2=344mm;
Speed of welding: 80mm/s;
Weld interval: 344/80=4.5s;
Running time: 4s+5s+3s=12s; Wherein 4s is that before welding, battery is proofreaied and correct, upwards held out against cylinder 8 and hold out against running time, and 5s is laser head contraposition after welding, proofread and correct cylinder upwards holds out against cylinder 8 and unclamp running time, and 3s is that two stations replace rotational time;
The total time of welding battery from material grasping to blowing: weld interval+running time=16.5s.
Adopt the existing fixture for laser welding without zero offset capability, the total time of welding battery from material grasping to blowing is 23.5s.
Show that this specific embodiment is due to material grasping blowing, positioning correcting, double rotation automatically automatically, limit blowing side weld connects, and the total time of welding battery from material grasping to blowing shortens 30%, improved efficiency, save manpower, alleviated operation easier, improved degree of safety.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make without departing from the concept of the premise utility some alternative or obvious modification that are equal to; and performance or purposes identical, all should be considered as belonging to the utility model by the definite scope of patent protection of submitted to claims.
Claims (3)
1. a fixture for laser welding with zero offset capability, comprises material grasping discharge mechanism and is positioned at the correction locating mechanism under described material grasping discharge mechanism, it is characterized in that:
Described material grasping discharge mechanism comprises:
The main lifting rotation drive disk assembly being formed by main lift cylinder, main lift cylinder connector, rotary cylinder and rotary cylinder adaptor;
Be connected by screw the cantilever of fixing main lifting rotation drive disk assembly;
By the first secondary lift cylinder, the first secondary lift cylinder connector, the first gas pawl and the first gas cleft hand, refer to the first manipulator forming;
By the second secondary lift cylinder, the second secondary lift cylinder connector, the second gas pawl and the second gas cleft hand, refer to the second manipulator forming;
Described correction locating mechanism comprises that double rotating mechanism, guiding clamping mechanism and correction hold out against rotating mechanism;
Described double rotating mechanism comprises:
By turntable, rotate platen and provide the double electric rotating machine that the double electric rotating machine with decelerator of rotary power forms to combine;
Fixed connecting plate;
Two station indexing rotary tables, described two station indexing rotary tables are fixed in electric rotating machine combination;
The first rotational slide being comprised of the first slide rail and clutch shaft bearing is combined, and described the first rotational slide combination is fixedly mounted on described two station indexing rotary tables;
The second rotational slide being comprised of the second slide rail and the second bearing is combined, and described the second rotational slide combination is fixedly mounted on described two station indexing rotary tables;
Described guiding clamping mechanism comprises:
The the first clamping combination being formed by the first Pneumatic connecting rod combination, the first roller combination and the first connecting support seat, described first clamps combination is fixed in the first rotational slide combination, described first clamps combination oscilaltion and rotatablely moves by described the first rotational slide combination transmission, and described the first Pneumatic connecting rod combination is comprised of the first clamping cylinder and the first clamping cylinder seat of the first clamp, first connecting rod mechanism, the drive first connecting rod mechanism work that moves up and down;
The the second clamping combination being formed by the second Pneumatic connecting rod combination, the second roller combination and the second connecting support seat, described second clamps combination is fixed in the second rotational slide combination, described second clamps combination oscilaltion and rotatablely moves by described the second rotational slide combination transmission, and described the second Pneumatic connecting rod combination is comprised of the second clamping cylinder and the second clamping cylinder seat of the second clamp, second connecting rod mechanism, the drive second connecting rod mechanism work that moves up and down;
Described correction holds out against rotating mechanism and comprises:
Upwards hold out against cylinder;
The battery rotary motor combination to be welded being formed by battery rotary motor to be welded, battery rotary motor fixing seat to be welded and battery rotary motor connector to be welded;
Suction opeing;
Proofread and correct combination for two jiaos that by correction cylinder and slide rail, are formed;
Baffle plate;
Combination is proofreaied and correct on the long limit being comprised of cylinder connecting plate, correction cylinder, correcting block;
Connecting plate;
And
Be fixed on the buffer stopper in battery rotary motor combination to be welded.
2. the fixture for laser welding with zero offset capability as claimed in claim 1, is characterized in that:
Described the first manipulator and the second manipulator are arranged on main lifting rotation drive disk assembly both sides, by described main lifting rotation drive disk assembly transmission lifting simultaneously and rotation interchangeable position, and described main lifting rotation drive disk assembly, described the first manipulator and the second manipulator independently move according to setting program separately.
3. the fixture for laser welding with zero offset capability as claimed in claim 1 or 2, is characterized in that:
Described the first rotational slide combination and the second rotational slide combined and alternatively Rotate 180 ° are driven by described double electric rotating machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320459458.4U CN203509357U (en) | 2013-07-30 | 2013-07-30 | Laser welding clamp with automatic correction function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320459458.4U CN203509357U (en) | 2013-07-30 | 2013-07-30 | Laser welding clamp with automatic correction function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203509357U true CN203509357U (en) | 2014-04-02 |
Family
ID=50368339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320459458.4U Expired - Lifetime CN203509357U (en) | 2013-07-30 | 2013-07-30 | Laser welding clamp with automatic correction function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203509357U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345263A (en) * | 2015-11-20 | 2016-02-24 | 武汉逸飞激光设备有限公司 | Full-automatic vertical position welding method for battery welding and fixture device |
-
2013
- 2013-07-30 CN CN201320459458.4U patent/CN203509357U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345263A (en) * | 2015-11-20 | 2016-02-24 | 武汉逸飞激光设备有限公司 | Full-automatic vertical position welding method for battery welding and fixture device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140402 |