CN101776203B - Manufacturing method of ring-shaped titanium alloy high-pressure cylinder - Google Patents
Manufacturing method of ring-shaped titanium alloy high-pressure cylinder Download PDFInfo
- Publication number
- CN101776203B CN101776203B CN2010100302145A CN201010030214A CN101776203B CN 101776203 B CN101776203 B CN 101776203B CN 2010100302145 A CN2010100302145 A CN 2010100302145A CN 201010030214 A CN201010030214 A CN 201010030214A CN 101776203 B CN101776203 B CN 101776203B
- Authority
- CN
- China
- Prior art keywords
- bottle
- welding
- titanium alloy
- ring
- tail
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention introduces a manufacturing method of a ring-shaped titanium alloy high-pressure cylinder, which comprises the following steps: material solution treatment, internal and external ring processing of the cylinder, cylinder body welding, cylinder body cutting, cylinder head, cylinder tail and adapter block processing, welding of the cylinder head, the cylinder tail and the cylinder body, welding of a cylinder head exhaust nozzle and the cylinder head, welding of an adapter block exhaust nozzle and the adapter block, vacuum aging procedure, and tooling use in the welding processes. The method of the invention realizes the manufacturing of titanium alloy ring-shaped precise containers, can obtain gas storage devices with the performance qualified and meeting quality requirements, and solves the manufacturing difficulty of the titanium alloy high-precision non-standard pressure containers for aviation.
Description
Technical field
The present invention relates to a kind of titanium alloy product manufacturing technology, particularly a kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder.
Background technique
Ring gas bottle is to be used for aerospace a kind of gas storage device, is different from conventional spherical and tubular gas cylinder, and the ring gas bottle described in the present invention is a kind of nonstandard shape gas cylinder, and storage gas is nitrogen.Working pressure is 66MPa, and profile is semi-circular structure, disposes bottle head, bottle tail and intake and exhaust device etc.
Progress along with aviation industry, manufacturing equipment becomes more meticulous day by day, owing to be subjected to the restriction of usage space, often very tight to the spatial requirement of this kind gas cylinder on equipment, promptly to guarantee the gas cylinder integral intensity, guarantee its assembly precision and gas-storing capacity again, its manufacture difficulty of the gas cylinder of this form is well imagined.According to the literature search result, the most researchs of the gas cylinder of the nonstandard form of this kind also are in the analog simulation stage, do not see relevant report for actual manufacturing technology.
Summary of the invention
Technical problem to be solved by this invention provides a kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder.
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder that the technical problem that the present invention further solves provides can be by rational technology and procedure arrangement, use conventional processing, welding equipment to realize the manufacturing of the high-accuracy pressurized container of aviation, minimizing equipment drops into, simplify numerous and diverse operation, reduce cost, can be applicable to the manufacturing of nonstandard shape titanium alloy cylinder.
For the purpose that realizes solving the problems of the technologies described above, the present invention has adopted following technological scheme:
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder of the present invention, described ring-shaped titanium alloy high-pressure cylinder is a kind of nonstandard shape gas cylinder, and the gas cylinder material is the TC4 titanium alloy, and the bottle profile is semi-circular structure, dispose bottle head, bottle tail and intake and exhaust device, it is characterized in that manufacture method comprises:
(1) material solution treatment: the TC4 alloy material is carried out vacuum solid solution handle, concrete processing method is: carry out solution treatment earlier, promptly 940～960 ℃, be incubated 30 minutes, shrend.This is owing to be the TC4 alloy that solid solution aging is handled to material requirements in the design of gas cylinder, thereby must handle, but can make material local heating and cause changes in material properties for fear of follow-up welding process, thereby adopted and be divided into two parts, promptly carry out solution treatment earlier, carry out welding process then, carry out ageing treatment again after welding is finished.
(2) gas cylinder inside and outside ring processing: adopt the full circle ring to process satisfactory inside and outside annulus;
(3) bottle welding: use conventional titanium alloy argon arc welding technology, the inside and outside circle boxing is connected into bottle, and in the welding process, weld seam and heat affected zone should be in the argon shield atmosphere all the time;
(4) bottle that adopts the method for line cutting that the inside and outside circle boxing is connected into is divided into two semicircles;
(5) weld reinforcement is removed in whole processing after welding;
(6) bottle head processing: adopt common process to process the bottle head of suitable dimension, for example can adopt the car controlling of full circle number of rings to process hexagonal external feature, carry out the line cutting then and cut apart the flat section of lathe, thread mill drilling adopts Computerized Numerical Control(CNC)lathe to process corresponding hemisphere hollow space then;
(7) bottle tail, the processing of switching piece: adopt common process to process bottle tail, the switching piece of suitable dimension; For example, bottle tail, switching piece can adopt bar processing, at first hole, machining screw, adopt the whole processing of numerically controlled lathe to obtain acceptable product then;
(8) bottle head, bottle tail and bottle welding: use the argon arc welding technology with bottle head, bottle tail and bottle welding;
(9) a bottle exhaust nozzle and the welding of bottle head, switching piece exhaust nozzle and switching block welding: use the Ti-Zr brazing filler metal in vacuum furnace, to finish welding process;
(10) vacuum aging is handled: last integral body is carried out the vacuum aging processing, and processing procedure is 940 ± 10 ℃, is incubated 120 minutes, cools off with stove.
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder of the present invention, its optimized technical scheme can be: the concrete grammar of described gas cylinder inside and outside ring processing is to use the circular TC4 alloy material of monoblock, Vehicle Processing goes out to meet the inside and outside semicircular ring of size requirement, and the bottle inner hollow partly is finish-machined to the size that needs; The whole 2mm machining allowance of reserving on the thickness direction of inside and outside annulus, after guaranteeing welding, the high temperature that can remove welding process by processing is to the material surface Effect on Performance, and needing to obtain size and surface finishment.
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder of the present invention; its optimized technical scheme can also be: described bottle welding process uses bottle welding protection frock; the bottle welding tooling be one by last disk and lower disc disc structure dimerous; the just corresponding groove of arranging semicircular ring on the last lower disc; last lower groove cooperation can be held the gas cylinder inside and outside ring and weld; to go up lower disc and use bolt locking; whole annulus can be encased; and the location of assurance annulus; have vent in lower disc one side, internal argon-filling gas is protected the welding part when welding.The further optimized technical scheme of technique scheme is: described bottle welding protection frock adopts the red copper manufacturing, can make good heat conductivity.
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder of the present invention; its optimized technical scheme can also be: described bottle tail welding process uses bottle tail frock; bottle tail frock is made up of double-screw bolt and base two-part; the hollow hemisphere position that holds bottle tail is arranged on the base; be connected with the bottle tail by double-screw bolt; and on double-screw bolt, have vent, when welding, inner applying argon gas is carried out air protection.The further optimized technical scheme of technique scheme is: described bottle tail frock adopts the red copper manufacturing.
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder of the present invention, described purity of argon is not less than 99.9%.
The frock that the present invention uses, its material adopts the extraordinary red copper of heat-conducting property, and frock encases gas cylinder integral body and fit tightly, and frock can greatly reduce the waiting time of gas cylinder in the high-temperature zone with the heat fast Absorption and the heat radiation of welding; Because frock encases gas cylinder integral body and fit tightly, argon gas is full of and remain on frock and gas cylinder between, make the gas cylinder outer surface obtain excellent protection; The gas cylinder tailing screw flight can be connected with the frock front threads, and gas cylinder can accurately be fixedly positioning, and installation, convenient disassembly, enhances productivity.
The exhaust nozzle of ring-shaped titanium alloy high-pressure cylinder is the vitals that the gas cylinder control gaseous flows out with the switching piece, its positional accuracy, sealing all have very high requirement, adopt its received heat of common welding excessive, can't satisfy its perpendicularity requirement, directly have influence on the normal use of gas cylinder, adopt the intensity that vacuum brazing can guarantee that it is enough and the requirement of boundary dimension.
These technological schemes comprise that improved technological scheme also can make up mutually or combination, thereby reach better technique effect.
By adopting technique scheme, the present invention has following beneficial effect:
A kind of manufacturing method of ring-shaped titanium alloy high-pressure cylinder of the present invention has been realized the manufacturing of the accurate container of annular titanium alloy, the qualified atmosphere storage device that satisfies quality requirement of availability; Solved the manufacturing difficult problem of aviation with the high-precision nonstandard pressurized container of titanium alloy; The frock material adopts the extraordinary red copper of heat-conducting property, and frock encases gas cylinder integral body and fit tightly, and frock can greatly reduce the waiting time of gas cylinder in the high-temperature zone with the heat fast Absorption and the heat radiation of welding; Because frock encases gas cylinder integral body and fit tightly, argon gas is full of and remain on frock and gas cylinder between, make the gas cylinder outer surface obtain excellent protection; The gas cylinder tailing screw flight can be connected with the frock front threads, and gas cylinder can accurately be fixedly positioning, and all adopts detachable design, and installation, convenient disassembly can be enhanced productivity greatly.
Description of drawings
Fig. 1 is a ring-shaped titanium alloy high-pressure cylinder schematic representation of the present invention.
Fig. 2 is a ring-shaped titanium alloy high-pressure cylinder cut-away section schematic representation of the present invention.
Fig. 3 is that schematic representation is looked on the B-B section left side of Fig. 2.
Fig. 4 is a titanium alloy high-pressure cylinder bottle schematic representation.
Fig. 5 is a titanium alloy high-pressure cylinder bottle tail front view.
Fig. 6 is a titanium alloy high-pressure cylinder bottle tail sectional view.
Fig. 7 is a titanium alloy high-pressure cylinder bottle tail right elevation.
Fig. 8 is that a titanium alloy high-pressure cylinder bottle D is to schematic representation.
Fig. 9 is the G-G direction sectional view of Fig. 8.
Figure 10 is the side sectional view of bottle head.
Figure 11 is a titanium alloy high-pressure cylinder switching piece schematic representation.
Figure 12 is that schematic representation is looked on the left side of Figure 11.
Figure 13 is the sectional view of Figure 11 along the H-H line.
Figure 14 is a titanium alloy high-pressure cylinder adapter assembly schematic representation.
Figure 15 is the adapter assembly generalized section.
Figure 16 is a bottle frock bottom sectional drawing.
Figure 17 is the plan view of Figure 16.
Figure 18 is a bottle frock top sectional drawing.
Figure 19 is the plan view on bottle frock top.
Figure 20 is a bottle tail frock base schematic representation.
Figure 21 is a bottle tail frock double-screw bolt schematic representation.
Among the figure, 1, bottle, 2, the bottle tail, 3, compressed air source unit and gas cylinder contiguous block, 4, the switching piece, 5, switching piece exhaust nozzle, 7, the bottle head, 8, a bottle exhaust nozzle.
Embodiment
A kind of ring-shaped titanium alloy high-pressure cylinder of the present invention, gas cylinder material are the TC4 alloy, and storage gas is nitrogen, working pressure is 66MPa, the bottle profile is semi-circular structure, disposes devices such as bottle 7, bottle tail 2 and switching piece exhaust nozzle 5, a bottle exhaust nozzle 8, and manufacture process is:
(1) material solution treatment: 940～960 ℃, be incubated 30 minutes, shrend.
(2) gas cylinder inside and outside ring processing: use the circular TC4 alloy material of monoblock, Vehicle Processing goes out to meet the inside and outside semicircular ring of size requirement, and the bottle inner hollow partly is finish-machined to the size that needs; The whole 2mm machining allowance of reserving on the thickness direction of inside and outside annulus, after guaranteeing welding, the high temperature that can remove welding process by processing is to the material surface Effect on Performance, and needing to obtain size and surface finishment.
(3) bottle 1 welding: use conventional titanium alloy argon arc welding technology, the inside and outside circle boxing is connected into bottle 1.Weld seam and heat affected zone are in the argon shield atmosphere all the time in the welding process, and purity of argon is not less than 99.9%.
Employed frock is the last disk and the lower disc disc structure dimerous of red copper made; the just corresponding groove of arranging semicircular ring on the last lower disc; last lower groove cooperation can be held the gas cylinder inside and outside ring and weld; to go up lower disc and use bolt locking; by the vent that has in a side, internal argon-filling gas is protected the welding part when welding.
(4) bottle that adopts the method for line cutting that the inside and outside circle boxing is connected into is divided into two semicircles;
(5) after welding, adopt the whole turning processing of numerical control car, remove and reserve machining allowance and weld reinforcement;
(6) bottle head processing: bottle 7 an employing full circle number of rings car controlling process hexagonal external feature, and carry out the line cutting then and cut apart, the car planar end surface, thread mill drilling adopts Computerized Numerical Control(CNC)lathe to process corresponding hemisphere hollow space then;
(7) bottle tail 2, the processing of switching piece 8: use sawing machine that bar is carried out sawing, to bar at first hole, machining screw, adopt numerically controlled lathe integral body to be machined to then and require size.
(8) adopt the argon shield welding procedure, with bottle 7, bottle tail 2 and bottle 1 welding.Use red copper bottle tail frock in bottle tail 2 and bottle 1 welding process, be connected with the bottle tail, when welding, inner applying argon gas is carried out air protection by the vent on the double-screw bolt by double-screw bolt.
(9) a bottle exhaust nozzle 8 and bottle 7 welding, switching piece exhaust nozzle 5 and 4 welding of switching piece: vacuum brazing switching piece exhaust nozzle 5 and switching piece 4, a bottle exhaust nozzle 8 and bottle 7 all uses the Ti-Zr brazing filler metal to finish welding process in vacuum furnace;
(10) vacuum aging is handled: last integral body is carried out the vacuum aging processing, and processing procedure is 940 ± 10 ℃, is incubated 120 minutes, cools off with stove.
The present embodiment toughness of material is good, and the strength of materials reaches 1100Mpa after tested, and specific elongation is more than 8%, and it is not obvious to descend.
Adopt above-mentioned manufacture method, the ring gas bottle of manufacturing, wall thickness are 5mm, working pressure 66Mpa, and weld seam is through infiltration and radiographic inspection, and the I level is qualified, and the finished product gas cylinder is up to the standards through air pressure tightness test, bursting test.
Adopt the manufacture method identical, promptly earlier material is carried out solution treatment, process again, weld with embodiment 1, and use protecting tool set-up equipment, having made diameter is the gas cylinder of 40mm, wall thickness is 5mm, working pressure 40MPa.Weld seam is through infiltration and radiographic inspection, and the I level is qualified, and the finished product gas cylinder is up to the standards through air pressure tightness test, bursting test.Toughness of material is good, and the strength of materials reaches 1100Mpa after tested, and specific elongation is more than 8%.
Comparative Examples 1
According to normal heat treatment, processing, welding procedure manufacture process be:
Material solid solution aging+processing+welding; Material solution treatment: 940～960 ℃, be incubated 30 minutes, shrend; Vacuum aging is handled, and processing procedure is 940 ± 10 ℃, is incubated 120 minutes, cools off with stove.
(1) TC4 alloy initial strength is that intensity reaches 1100MPa behind solid solution aging about 940MPa, improves nearly 20%, intensity increases considerably, and the engine lathe cutter can't be processed, and can only use the processing of import cutter, and, increase manufacture difficulty and cost to the cutter well damage.
(2) in the gas cylinder welding process, the welding heat affected zone temperature reaches more than 900 degree, is equivalent to material justice has been carried out a heat treatment, temperature approaches solid solution temperature, and material property descends obviously, after tested, the material specific elongation drops to 5% by 10%, descends nearly 50%.Have a strong impact on material property, in the 66MPa pneumatic test, material generation brittle fracture.Can't realize the gas cylinder manufacturing.
Claims (6)
1. manufacturing method of ring-shaped titanium alloy high-pressure cylinder, described ring-shaped titanium alloy high-pressure cylinder is a kind of nonstandard shape gas cylinder, and the gas cylinder material is the TC4 titanium alloy, and the bottle profile is semi-circular structure, dispose bottle head (7), bottle tail (2) and intake and exhaust device, it is characterized in that manufacture method comprises:
(1) the material solid solution aging is handled: the TC4 titanium alloy material is carried out vacuum solid solution handle, concrete processing method is: carry out solution treatment earlier, promptly 940～960 ℃, be incubated 30 minutes, shrend;
(2) gas cylinder inside and outside ring processing: adopt the full circle ring to process satisfactory inside and outside annulus;
(3) bottle welding: use conventional titanium alloy argon arc welding technology, the inside and outside circle boxing is connected into bottle; In the welding process, weld seam and heat affected zone should be in the argon shield atmosphere all the time;
(4) bottle that adopts the method for line cutting that the inside and outside circle boxing is connected into is divided into two semicircles;
(5) weld reinforcement is removed in whole processing after welding;
(6) bottle head (7) processing: adopt common process to process the bottle head (7) of suitable dimension;
(7) bottle tail (2), switching piece (4) processing: adopt common process to process bottle tail (2), the switching piece (4) of suitable dimension;
(8) bottle head (7), bottle tail (2) and bottle (1) welding: use the argon arc welding technology with bottle head (7), bottle tail (2) and bottle (1) welding;
(9) a bottle exhaust nozzle (8) and bottle head (7) welding, switching piece exhaust nozzle (5) and switching piece (4) welding: all use the Ti-Zr brazing filler metal in vacuum furnace, to finish welding process;
(10) vacuum aging is handled: last integral body is carried out the vacuum aging processing, and processing procedure is 940 ± 10 ℃, is incubated 120 minutes, with the stove cooling, finishes course of working.
2. according to the described manufacturing method of ring-shaped titanium alloy high-pressure cylinder of claim 1, it is characterized in that: the concrete grammar of described gas cylinder inside and outside ring processing is, use the circular TC4 titanium alloy material of monoblock, Vehicle Processing goes out to meet the inside and outside annulus of size requirement, the bottle inner hollow partly is finish-machined to the size that needs, the whole 2mm machining allowance of reserving on the thickness direction of inside and outside annulus.
3. according to the described manufacturing method of ring-shaped titanium alloy high-pressure cylinder of claim 1; it is characterized in that: described bottle (1) welding process uses bottle welding protection frock; bottle welding protection frock be one by last disk and lower disc disc structure dimerous; the corresponding groove of arranging semicircular ring on the last lower disc; last lower groove cooperation can be held the inside and outside annulus of gas cylinder and weld; to go up lower disc and use bolt locking; whole annulus can be encased; and the location of assurance annulus; have vent in lower disc one side, internal argon-filling gas is protected the welding part when welding.
4. according to the described manufacturing method of ring-shaped titanium alloy high-pressure cylinder of claim 3, it is characterized in that: described bottle welding protection frock adopts the red copper manufacturing.
5. according to the described manufacturing method of ring-shaped titanium alloy high-pressure cylinder of claim 1; it is characterized in that: described bottle tail and bottle welding process use bottle tail frock; bottle tail frock is made up of double-screw bolt and base two-part; the hollow hemisphere position that holds a bottle tail (2) is arranged on the base; be connected with bottle tail (2) by double-screw bolt; and on double-screw bolt, have vent, when welding, inner applying argon gas is carried out air protection.
6. according to the described manufacturing method of ring-shaped titanium alloy high-pressure cylinder of claim 5, it is characterized in that: described bottle tail frock adopts the red copper manufacturing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100302145A CN101776203B (en) | 2010-01-20 | 2010-01-20 | Manufacturing method of ring-shaped titanium alloy high-pressure cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100302145A CN101776203B (en) | 2010-01-20 | 2010-01-20 | Manufacturing method of ring-shaped titanium alloy high-pressure cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101776203A CN101776203A (en) | 2010-07-14 |
| CN101776203B true CN101776203B (en) | 2011-08-31 |
Family
ID=42512742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100302145A Expired - Fee Related CN101776203B (en) | 2010-01-20 | 2010-01-20 | Manufacturing method of ring-shaped titanium alloy high-pressure cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101776203B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107709691A (en) | 2015-07-21 | 2018-02-16 | 哈里伯顿能源服务公司 | Rock bit axle journal with asymmetric ball race and extension friction seat ring |
| CN109047998B (en) * | 2018-08-14 | 2020-09-04 | 上海空间推进研究所 | Method for improving automatic argon arc welding forming quality and production efficiency of system pipeline |
| CN111687361B (en) * | 2020-06-18 | 2022-09-23 | 无锡宏达重工股份有限公司 | Forming method of titanium alloy pipe for 40MPa ultrahigh-pressure gas cylinder |
| CN112682685A (en) * | 2020-12-14 | 2021-04-20 | 深圳溪河科技有限公司 | U-shaped high-pressure gas cylinder |
-
2010
- 2010-01-20 CN CN2010100302145A patent/CN101776203B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101776203A (en) | 2010-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101776203B (en) | Manufacturing method of ring-shaped titanium alloy high-pressure cylinder | |
| CN103111808B (en) | A kind of nickel base superalloy GH4169 hexagon socket head cap screw processing technologys | |
| CN102626848A (en) | Processing method of flexible nozzle thin-wall dual-spherical reinforcing part and device thereof | |
| CN105710392A (en) | Machining process for annular thin-wall part and tool thereof | |
| CN111097924B (en) | Processing method of end socket for pressure container | |
| CN110039269B (en) | Manufacturing method of thin-wall deep-hole sealing shell of driving mechanism | |
| CN205630067U (en) | Clamping means for machine processing | |
| CN105033590A (en) | Machining process of valve body of large-flow cartridge valve | |
| CN102840240B (en) | Hard alloy radial bearing body and production process thereof | |
| CN104388949B (en) | Impaired titanium alloy forging continuous point type forging and stamping Laser forming repair device | |
| CN106514172A (en) | Oblique tooth machining process for gear mold | |
| CN204221369U (en) | The two main shaft turning-milling complex processing lathe of aeroplane engine casing processing | |
| US8338736B2 (en) | Extraction of chordal test specimens from forgings | |
| CN103047441A (en) | Valve rod for high-temperature high-pressure stop valve and machining method of valve rod | |
| CN201848642U (en) | Plane and cylinder plasma cutting integrated machine | |
| CN104002104A (en) | Processing method for high-temperature high-pressure pipeline connecting ring applied to aircrafts | |
| CN203696170U (en) | Built-up jig for machining main body and sleeve of lathe wrench | |
| CN110552005A (en) | Valve body multi-surface continuous abrasion fixing device and laser repairing method | |
| CN103182622A (en) | Rough machining method for cylinder casting of steam turbine | |
| CN203817811U (en) | Processing tooling for reducing pipes | |
| CN203973073U (en) | Mining hydraulic individual prop post friction welded joint alive structure | |
| CN101961813B (en) | Integrated planar & cylindrical plasma cutting machine | |
| CN104154684B (en) | The processing method of a kind of divider and processing divider | |
| CN209319354U (en) | Fixture suitable for irregular casting turning | |
| CN105252288B (en) | Formula gas or liquid valve body annular seal groove numerical control turning fixture are pushed up afterwards |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20210120 |