CN100437858C - Machining technique of silver/copper/iron composite strip material - Google Patents
Machining technique of silver/copper/iron composite strip material Download PDFInfo
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- CN100437858C CN100437858C CNB2006101237594A CN200610123759A CN100437858C CN 100437858 C CN100437858 C CN 100437858C CN B2006101237594 A CNB2006101237594 A CN B2006101237594A CN 200610123759 A CN200610123759 A CN 200610123759A CN 100437858 C CN100437858 C CN 100437858C
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- Prior art keywords
- silver
- copper
- band
- composite strip
- strip material
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 62
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 44
- 239000010949 copper Substances 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 title claims abstract description 37
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 36
- 239000004332 silver Substances 0.000 title claims abstract description 36
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 31
- 239000002131 composite material Substances 0.000 title claims description 37
- 238000000034 method Methods 0.000 title abstract description 12
- 238000003754 machining Methods 0.000 title 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 150000001875 compounds Chemical class 0.000 claims abstract description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims description 30
- 150000004706 metal oxides Chemical class 0.000 claims description 30
- 238000000137 annealing Methods 0.000 claims description 26
- 238000005098 hot rolling Methods 0.000 claims description 21
- 238000005096 rolling process Methods 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 11
- 238000007669 thermal treatment Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 7
- 150000002506 iron compounds Chemical class 0.000 abstract 2
- 230000005611 electricity Effects 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 3
- 229910001887 tin oxide Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010946 fine silver Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 229910001923 silver oxide Inorganic materials 0.000 description 2
- 239000005749 Copper compound Substances 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001880 copper compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000010930 yellow gold Substances 0.000 description 1
- 229910001097 yellow gold Inorganic materials 0.000 description 1
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Abstract
This invention relates to compound materials technique field to process electricity probe and especially to one silver and copper and iron compound process method, which comprises the following steps: firstly grinding the silver metal oxidation and one film of pure silver materials for combination; then grinding the copper band and iron band to process this invention silver, copper and iron compound band.
Description
Technical field:
The present invention relates to prepare the composite strip technical field of electrical contact, the processing technology of refering in particular to a kind of silver/copper/iron composite strip material.
Background technology:
Electrical contact is the contact element of instrument and meters such as appliance switch, thermostat, it mainly bears the effect of connection and breaking current, it has decisive role to the safe operation of electrical equipment, in electrical contact material, siluer metal oxide (as siller tin oxide AgSnO2, Agcdo AgCdO etc.) material is owing to have anti-preferably electrical wear, resistance fusion welding and conductivity are used widely in low-voltage electrical apparatus.Extensive use along with electronic product, the demand of electrical contact also increases day by day, electrical contact on the bimetallic that silver-bearing copper is composited is arranged at present, but the welding of material such as silver, copper and sheet metal in the electrical contact, all exist the not good problem of welding fastness, have security-hidden trouble, therefore, this kind electrical contact generally is installed on the appliance switch by clinching method.If adopt clinching method to install, if riveted joint tension then cause the bimetallic distortion, if riveted pine then cause system resistance to increase, both of these case all can cause the error of thermostat, and therefore, there are many deficiencies in this kind electrical contact on using.
In addition, at present domestic aspect the composite material of producing electrical contact primary study the bar of yellow gold and oxygen-free copper compound, face is compound, there are indivedual factories testing the compound of silver oxide and copper, its mode of production is for argon arc welding the edge of the silver oxide plate ingot of 20mm and thick copper ingot two materials being welded earlier, then with heavy reduction rolling under the roughing mill.Through diffusion annealing repeatedly, the rolling combination that reaches different metal.This production technology is relatively backward, can not large-scale production, and production cost is high.
Summary of the invention:
The objective of the invention is to provide at the deficiencies in the prior art the processing technology of a kind of silver/copper/iron composite strip material, this kind technology is simple, and operation is few, and can scale produce in enormous quantities, the production efficiency height, and production cost is low.
For achieving the above object, the present invention is achieved by the following technical solutions: it may further comprise the steps:
A, earlier respectively silver band and siluer metal oxide band are carried out surface clean, remove its surperficial greasy dirt, oxide, again silver-colored band and siluer metal oxide band are sent into a compound siluer metal oxide/silver-colored composite strip that becomes of hot-rolling mill hot rolling together, hot-rolled temperature is 300～800 ℃, tape running speed is 1.0～5.0m/min, the unwinding and rewinding tension force 1～200KN of band, roll-force is 10～120 tons, then again it is annealed, annealing temperature is 400～600 ℃, and annealing time is 0.2～1 hour, again it is sent into finishing mill after the annealing and carry out finish rolling system, anneal once more after the finish rolling system, annealing temperature is 400～600 ℃, and annealing time is 0.2～1 hour, and sending into finishing mill after the annealing once more, to carry out finished product rolling, at last it is sent into banding machine and carry out itemize, make siluer metal oxide/silver-colored composite strip finished product;
B, earlier respectively to siluer metal oxide/silver-colored composite strip, copper strips and sheet iron strip material carry out surface clean, remove its surperficial greasy dirt, oxide, again three kinds of bands are together sent into the compound one bullion/copper/iron composite strip material that becomes of hot-rolling mill hot rolling, hot-rolled temperature is 300～800 ℃, tape running speed is 1.0～5.0m/min, the unwinding and rewinding tension force 1～200KN of band, roll-force is 10～120 tons, then silver/copper/iron composite strip material is annealed, annealing temperature is 400～600 ℃, annealing time is 0.1～1 hour, and then silver/copper/iron composite strip material carried out surface clean, polishing and oven dry, send into finishing mill after the oven dry again and carry out finish rolling, will send into banding machine through the silver/copper/iron composite strip material of finish rolling at last and carry out itemize;
C, finished product.
Order is equipped with unreeling structure, band is positioned and spacing positioner, the thermal treatment zone, roll, a rolling-up mechanism on the described hot-rolling mill, the described thermal treatment zone is the high-frequency electrical heating furnace, described positioner is two groups of locating wheels that limit band position and its position of scalable that are distributed in the band both sides, and every group of locating wheel has three.
The composite material of electrical contact of the present invention is the new function material that is combined by special combination process by cheap metal iron, copper and three kinds of materials of silver-base alloy, it keeps the main characteristic of siluer metal oxide and base material, and by the not available performance of complex effect acquisition stock blend, complement each other, take into account each other, described siluer metal oxide comprises silver-colored oxygen tin indium AgSno2 ino3, siller tin oxide AgSnO2, Agcdo AgCdO etc.Conduction because of copper, thermal conductivity is only second to siluer metal oxide (as AgMeO), so can replace whole siluer metal oxide material with the composite material of copper and siluer metal oxide, and performance is suitable with whole siluer metal oxide (as AgMeO) material, but because the mechanical performance of copper is relatively poor, intensity is low, hardness is low etc., for overcoming the mechanical performance of copper, under the condition that does not influence electrical property, the applicant develops silver/copper/iron composite strip material, it then be may be molded to circular contact through punching press, silver is used in key position, both saved silver, the anti-electrical wear of performance silver contact, the advantage of resistance fusion welding and conductivity, can improve mechanical performance and weldability again, be an important joint silver technology, this kind electrical contact solder side is a stainless iron, and has small salient point, to increase welding performance, can make ferrous alloy firm welding such as electrical contact and bimetal leaf and stainless steel substrates.Because the bond strength of siluer metal oxide and copper is relatively poor, for overcoming this defective, the present invention has selected fine silver as transition zone, to strengthen the bond strength of siluer metal oxide and copper, earlier that siluer metal oxide and is thin fine silver band hot rolling is compound, again it is combined into silver/copper of the present invention/iron composite strip material with copper strips and sheet iron strip hot rolling, this also is crucial part of the present invention place.In sum, technology of the present invention is simple, is easy to realize, the production efficiency height, and can realize large-scale production, production cost is low, the properties of product of being produced are safe and reliable, have good binding intensity, compound fastness, electrical property, mechanical performance and weldability, and save silver.
Description of drawings:
Accompanying drawing 1 is made the process chart of siluer metal oxide/silver-colored composite strip for the present invention;
Accompanying drawing 2 is made the process chart of silver/copper/iron composite strip material for the present invention;
Accompanying drawing 3 is the view in transverse section of silver/copper/iron composite strip material that the present invention processed;
Accompanying drawing 4 is the structural representation of hot-rolling mill of the present invention;
Accompanying drawing 5 is the structural representation of the positioner on the hot-rolling mill of the present invention.
Embodiment:
For further prompting the present invention, illustrate specifically below in conjunction with accompanying drawing 1,2,3,4,5.
In fact silver/copper that the present invention produced/iron composite strip material has four-layer structure, and from top to bottom, ground floor is a siluer metal oxide band 1, and the second layer is the pure silver belt 2 excessive layers of thinner thickness, and the 3rd layer is that copper strips is a sheet iron strip 4 for 3, the four layers.Wherein, the band that described siluer metal oxide band 1 is made for siluer metal oxide, described siluer metal oxide comprises silver-colored oxygen tin indium AgSno2 ino3, siller tin oxide AgSnO2, Agcdo AgCdO etc., and described copper strips 3 is copper or copper alloy belt, and its technology is as follows:
A, earlier respectively to silver be with 2 and siluer metal oxide band 1 carry out surface clean, remove its surperficial greasy dirt, oxide, again silver is with 2 and siluer metal oxide band 1 send into a compound siluer metal oxide/silver-colored composite band 5 that becomes of hot-rolling mill hot rolling together, hot-rolled temperature is 300～800 ℃, tape running speed is 1.0～5.0m/min, the unwinding and rewinding tension force 1～200KN of band, roll-force is 10～120 tons, then be placed in the pit-type furnace again and anneal, annealing temperature is 400～600 ℃, annealing time is 0.2～1 hour, again it is sent into finishing mill after the annealing and carry out finish rolling system, be placed in the pit-type furnace once more after the finish rolling system and anneal, annealing temperature is 400～600 ℃, and annealing time is 0.2～1 hour, and sending into finishing mill after the annealing once more, to carry out finished product rolling, at last it is sent into banding machine and carry out itemize, make siluer metal oxide/silver-colored composite band 5 finished products;
B, earlier respectively to siluer metal oxide/silver-colored composite band 5, copper strips 3 and sheet iron strip 4 carry out surface clean, remove its surperficial greasy dirt, oxide, again three kinds of bands are together sent into the compound one bullion/copper/iron composite strip material that becomes of hot-rolling mill hot rolling, hot-rolled temperature is 300～800 ℃, tape running speed is 1.0～5.0m/min, the unwinding and rewinding tension force 1～200KN of band, roll-force is 10～120 tons, then silver/copper/iron composite strip material is placed in the potoven and anneals, annealing temperature is 400～600 ℃, annealing time is 0.1～1 hour, and then silver/copper/iron composite strip material carried out surface clean, polishing and oven dry, send into finishing mill after the oven dry again and carry out finish rolling, will send into banding machine through the silver/copper/iron composite strip material of finish rolling at last and carry out itemize;
C, finished product.
In the above-mentioned hot rolling combination process, whether good coordination between its heating-up temperature, tape running speed, roll-force person coupling be the compound fastness of material key; And the unwinding and rewinding tension force of its band must be steadily, and the unwinding and rewinding tension force of band surely is to guarantee that band is straight, quantity-produced is crucial.Band after hot rolling is compound through potoven annealing, further strengthens the atom diffusion at different metal interface again, strengthens compound fastness.
Described hot-rolling mill is equipped with three unreeling structures 7 in proper order, band is positioned and spacing positioner, the thermal treatment zone 6, roll 8, a rolling-up mechanism 9, the described thermal treatment zone 6 is the high-frequency electrical heating furnace, described positioner is two groups of locating wheels 10 that are distributed in the band both sides, every group of locating wheel 10 has three, locating wheel 10 limits the band position, and its position of locating wheel 10 scalable, keep straight line to carry by these six locating wheels, 10 may command bands, guarantee that its quantity-produced carries out smoothly.
It only is preferred embodiment of the present invention that above institute is chatted, so all equivalences of doing according to the described structure of the present patent application claim, feature and principle change or decorate, is included in the present patent application claim.
Claims (2)
1, the processing technology of a kind of silver/copper/iron composite strip material, it is characterized in that: it may further comprise the steps:
A, earlier respectively silver band and siluer metal oxide band are carried out surface clean, remove its surperficial greasy dirt, oxide, again silver band and siluer metal oxide band are sent into a compound siluer metal oxide/silver-colored composite strip that becomes of hot-rolling mill hot rolling together, hot-rolled temperature is 300～800 ℃, tape running speed is 1.0～5.0m/min, the unwinding and rewinding tension force 1～200KN of band, roll-force is 10～120 tons, then again it is annealed, annealing temperature is 400～600 ℃, and annealing time is 0.2～1 hour, again it is sent into finishing mill after the annealing and carry out finish rolling system, anneal once more after the finish rolling system, annealing temperature is 400～600 ℃, and annealing time is 0.2～1 hour, and sending into finishing mill after the annealing once more, to carry out finished product rolling, at last it is sent into banding machine and carry out itemize, make siluer metal oxide/silver-colored composite strip finished product;
B, earlier respectively to siluer metal oxide/silver-colored composite strip, copper strips and sheet iron strip material carry out surface clean, remove its surperficial greasy dirt, oxide, again three kinds of bands are together sent into the compound one bullion/copper/iron composite strip material that becomes of hot-rolling mill hot rolling, hot-rolled temperature is 300～800 ℃, tape running speed is 1.0～5.0m/min, the unwinding and rewinding tension force 1～200KN of band, roll-force is 10～120 tons, then silver/copper/iron composite strip material is annealed, annealing temperature is 400～600 ℃, annealing time is 0.1～1 hour, and then silver/copper/iron composite strip material carried out surface clean, polishing and oven dry, send into finishing mill after the oven dry again and carry out finish rolling, will send into banding machine through the silver/copper/iron composite strip material of finish rolling at last and carry out itemize;
C, finished product.
2, the processing technology of a kind of silver/copper according to claim 1/iron composite strip material, it is characterized in that: order is equipped with unreeling structure, band is positioned and spacing positioner, the thermal treatment zone, roll, a rolling-up mechanism on the described hot-rolling mill, the described thermal treatment zone is the high-frequency electrical heating furnace, described positioner is two groups of locating wheels that limit band position and its position of scalable that are distributed in the band both sides, and every group of locating wheel has three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101237594A CN100437858C (en) | 2006-11-24 | 2006-11-24 | Machining technique of silver/copper/iron composite strip material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101237594A CN100437858C (en) | 2006-11-24 | 2006-11-24 | Machining technique of silver/copper/iron composite strip material |
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| Publication Number | Publication Date |
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| CN1971790A CN1971790A (en) | 2007-05-30 |
| CN100437858C true CN100437858C (en) | 2008-11-26 |
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| CNB2006101237594A Expired - Fee Related CN100437858C (en) | 2006-11-24 | 2006-11-24 | Machining technique of silver/copper/iron composite strip material |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241811B (en) * | 2008-02-25 | 2011-01-26 | 重庆川仪自动化股份有限公司 | Making method for temperature controller heteromorphism section electric contact material |
| WO2013005801A1 (en) * | 2011-07-06 | 2013-01-10 | 株式会社徳力本店 | Electrode material for thermal fuses, manufacturing process therefor and thermal fuses using said electrode material |
| CN102489871A (en) * | 2011-12-05 | 2012-06-13 | 贵研铂业股份有限公司 | Welding method of copper and copper alloy |
| CN102489969A (en) * | 2011-12-16 | 2012-06-13 | 福达合金材料股份有限公司 | Preparation method and continuous production and forming device of precision compound narrow band |
| CN105225856B (en) * | 2015-08-28 | 2018-02-06 | 宁波科扬贵金属合金科技有限公司 | The manufacture method and manufacturing equipment of a kind of compound silver band |
| CN105047455B (en) * | 2015-08-28 | 2017-05-10 | 宁波科扬贵金属合金科技有限公司 | Manufacturing method and manufacturing equipment of composite silver strip |
| CN105225855B (en) * | 2015-08-28 | 2017-07-18 | 宁波科扬贵金属合金科技有限公司 | The manufacture method and manufacturing equipment of compound silver band |
| CN105609333B (en) * | 2015-12-29 | 2018-01-23 | 桂林电器科学研究院有限公司 | A kind of preparation method of silver oxide/three layers of composite strip of silver/copper |
| CN107591257B (en) * | 2017-10-20 | 2020-11-10 | 温州宏丰电工合金股份有限公司 | Silver-based multilayer composite electric contact material and preparation method thereof |
| CN110355533A (en) * | 2019-07-29 | 2019-10-22 | 东莞市中一合金科技有限公司 | A kind of preparation process of the continuous soldering composite material of copper-tin |
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| CN86108242A (en) * | 1986-12-01 | 1988-06-22 | 济南电工合金厂 | Extrusion-processing technology for silver series electric contact materials |
| CN2058526U (en) * | 1988-01-13 | 1990-06-20 | 浙江省瑞安市电工合金材料厂 | Silver nickel copper compound electric contact |
| CN1092903A (en) * | 1993-10-04 | 1994-09-28 | 沈阳黄金学院贵金属材料厂 | Silver/copper/silver-copper-zinc composite contact material and manufacturing method thereof |
| CN1441071A (en) * | 2003-04-03 | 2003-09-10 | 章景兴 | Electric alloy contact of silver, tin oxide and copper oxide and its production process |
| CN1838354A (en) * | 2006-03-02 | 2006-09-27 | 乐百令 | Three-layer composite electric contact manufacturing process |
-
2006
- 2006-11-24 CN CNB2006101237594A patent/CN100437858C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108242A (en) * | 1986-12-01 | 1988-06-22 | 济南电工合金厂 | Extrusion-processing technology for silver series electric contact materials |
| CN2058526U (en) * | 1988-01-13 | 1990-06-20 | 浙江省瑞安市电工合金材料厂 | Silver nickel copper compound electric contact |
| CN1092903A (en) * | 1993-10-04 | 1994-09-28 | 沈阳黄金学院贵金属材料厂 | Silver/copper/silver-copper-zinc composite contact material and manufacturing method thereof |
| CN1441071A (en) * | 2003-04-03 | 2003-09-10 | 章景兴 | Electric alloy contact of silver, tin oxide and copper oxide and its production process |
| CN1838354A (en) * | 2006-03-02 | 2006-09-27 | 乐百令 | Three-layer composite electric contact manufacturing process |
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| CN1971790A (en) | 2007-05-30 |
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Denomination of invention: Machining technique of silver/copper/iron composite strip material Effective date of registration: 20130619 Granted publication date: 20081126 Pledgee: Dongguan rural commercial bank Limited by Share Ltd. Dalang branch Pledgor: Lin Yujin|Sino-1 Electrical Contacts Alloy Co.,Ltd. Registration number: 2013990000387 |
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Date of cancellation: 20140901 Granted publication date: 20081126 Pledgee: Dongguan rural commercial bank Limited by Share Ltd. Dalang branch Pledgor: Lin Yujin|Sino-1 Electrical Contacts Alloy Co.,Ltd. Registration number: 2013990000387 |
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Denomination of invention: Machining technique of silver/copper/iron composite strip material Effective date of registration: 20140902 Granted publication date: 20081126 Pledgee: Dongguan rural commercial bank Limited by Share Ltd. Dalang branch Pledgor: Sino-1 Electrical Contacts Alloy Co.,Ltd.|Lin Yujin Registration number: 2014990000724 |
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Date of cancellation: 20161207 Granted publication date: 20081126 Pledgee: Dongguan rural commercial bank Limited by Share Ltd. Dalang branch Pledgor: Sino-1 Electrical Contacts Alloy Co.,Ltd.|Lin Yujin Registration number: 2014990000724 |
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Effective date of registration: 20170414 Address after: 523000 Dongguan City, Dalang Province Town Lane, the first industrial zone, the first third Patentee after: Sino-1 Electrical Contacts Alloy Co.,Ltd. Address before: 523810 Guangdong City, Dalang Province town of lane in the first industrial zone, Dongguan City, one of the first alloy technology Co., Ltd., Patentee before: Lin Yujin |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20081126 Termination date: 20211124 |