CN104745870B - A kind of joint prosthesis - Google Patents
A kind of joint prosthesis Download PDFInfo
- Publication number
- CN104745870B CN104745870B CN201510172954.5A CN201510172954A CN104745870B CN 104745870 B CN104745870 B CN 104745870B CN 201510172954 A CN201510172954 A CN 201510172954A CN 104745870 B CN104745870 B CN 104745870B
- Authority
- CN
- China
- Prior art keywords
- joint prosthesis
- finished product
- semi
- heated
- incubated
- 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.)
- Active
Links
Landscapes
- Prostheses (AREA)
- Dental Prosthetics (AREA)
Abstract
The present invention relates to a kind of joint prosthesis, its material is titanium alloy, preparation process includes that raw material prepares and the step such as melting, hot investment casting, annealing, artificial aging, subzero treatment, solution treatment, for the second time artificial aging obtains joint prosthesis finished product, coordinated with above-mentioned heat treatment step by adjustment titanium alloy component so that the performances such as the intensity of this joint prosthesis, elastic modelling quantity and corrosion resistance are greatly improved simultaneously.
Description
Technical field
The invention belongs to artificial joint, artifical bone header territory, particularly relate to a kind of joint prosthesis and heat treatment method thereof.
Background technology
Bio-medical material routine in medical domain is the artificial organs in implanting human body, the demand of artificial joint increases considerably at present, joint prosthesis application in medical domain gets more and more, such operation is more and more ripe, but intensity and the elastic modelling quantity of joint prosthesis is not the highest at present so that the service life of joint prosthesis has obtained certain restriction.The most conventional employing zircaloy or titanium alloy make joint prosthesis, more existing technology add the elements such as Pb in titanium alloy, by promoting the anodic passivity of titanium, thus improve the corrosion resistance of medical titanium alloy, avoid crevice corrosion, but Pb is a Heavy Metallic Elements, be that total ban uses in Europe, the U.S. and Japan, the Pb element easily making human body due to it for a long time in human body exceeds standard, it is possible to make human body Pb be poisoned.Therefore it is badly in need of developing the joint prosthesis that a kind of high intensity, high elastic modulus and rotproofness are splendid.
Summary of the invention
An object of the present invention is to propose a kind of joint prosthesis.
The two of the purpose of the present invention are to propose the heat treatment method of a kind of joint prosthesis.
Realize especially by following technological means:
1. a joint prosthesis, the material of described joint prosthesis is titanium alloy, and the composition of described titanium alloy content by weight percentage is: Al:4.5 ~ 5.2%, Ga:2.5 ~ 6.8%, V:3.8 ~ 4.8%, surplus is titanium and inevitable impurity, and Fe≤0.20% in impurity, C≤0.05%, N≤0.01%.
Preparation method comprises the steps:
(1) raw material prepares and melting: selecting titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum≤10Pa, using vacuum consumable electrode arc furnace to carry out twice melting is titanium ingot casting；The intermediate alloy of this titanium ingot casting Yu Ga, Al and V is joined in vacuum melting furnace jointly the melts of titanium alloy being smelted into required composition.
(2) hot investment casting: use the method for hot investment casting to obtain joint prosthesis semi-finished product after being incubated by the melt that step (1) obtains.
(3) annealing: the joint prosthesis semi-finished product that step (2) obtains are encased in vacuum induction heat-treatment furnace and are heated to 520 ~ 590 DEG C, insulation 40 ~ 50min, is heated to 620 ~ 690 DEG C, is incubated 20 ~ 30min, being heated to 750 ~ 780 DEG C, after insulation 55 ~ 65min, air cooling is to room temperature.
(4) artificial aging: the joint prosthesis semi-finished product after step (3) being processed are inserted and are heated to 310 ~ 360 DEG C in aging furnace, are cooled to room temperature after being incubated 4 ~ 6 hours.
(5) subzero treatment: the joint prosthesis semi-finished product after artificial aging insert deep cooling box, cools to-120 ~-180 DEG C, returns to room temperature after subzero treatment 25 ~ 35min.
(6) solution treatment: insert in Solution Treatment Furnace by the joint prosthesis semi-finished product after subzero treatment, is heated to 820 ~ 860 DEG C, shrend after being incubated 0.8 ~ 1.2 hour.
(7) artificial aging for the second time: the joint prosthesis semi-finished product after solution treatment are inserted and is heated to 320 ~ 360 DEG C in aging furnace, be cooled to room temperature after being incubated 4 ~ 6 hours, i.e. obtain joint prosthesis finished product.
As preferably, the tensile strength >=980MPa of described joint prosthesis, percentage elongation >=20% after forging, the contraction percentage of area >=45%.
As preferably, the elastic modelling quantity of described joint prosthesis is 58 ~ 72GPa.
As preferably, the tensile strength of described joint prosthesis: 990 ~ 1200MPa, percentage elongation after forging: 20 ~ 28%, the contraction percentage of area: 45 ~ 52%, elastic modelling quantity is 59 ~ 71GPa.
The manufacture method of a kind of joint prosthesis, comprises the steps.
(1) raw material prepares and melting: selecting titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum≤10Pa, using vacuum consumable electrode arc furnace to carry out twice melting is titanium ingot casting；The intermediate alloy of this titanium ingot casting Yu Ga, Al and V is joined in vacuum melting furnace jointly the melts of titanium alloy being smelted into required composition.
(2) hot investment casting: use the method for hot investment casting to obtain joint prosthesis semi-finished product after being incubated by the melt that step (1) obtains.
(3) annealing: the joint prosthesis semi-finished product that step (2) obtains are encased in vacuum induction heat-treatment furnace and are heated to 520 ~ 590 DEG C, insulation 40 ~ 50min, is heated to 620 ~ 690 DEG C, is incubated 20 ~ 30min, being heated to 750 ~ 780 DEG C, after insulation 55 ~ 65min, air cooling is to room temperature.
(4) artificial aging: the joint prosthesis semi-finished product after step (3) being processed are inserted and are heated to 310 ~ 360 DEG C in aging furnace, are cooled to room temperature after being incubated 4 ~ 6 hours.
(5) subzero treatment: the joint prosthesis semi-finished product after artificial aging insert deep cooling box, cools to-120 ~-180 DEG C, returns to room temperature after subzero treatment 25 ~ 35min.
(6) solution treatment: insert in Solution Treatment Furnace by the joint prosthesis semi-finished product after subzero treatment, is heated to 820 ~ 860 DEG C, shrend after being incubated 0.8 ~ 1.2 hour.
(7) artificial aging for the second time: the joint prosthesis semi-finished product after solution treatment are inserted and is heated to 320 ~ 360 DEG C in aging furnace, be cooled to room temperature after being incubated 4 ~ 6 hours, i.e. obtain joint prosthesis finished product.
The material of described joint prosthesis is titanium alloy, and the composition of described titanium alloy content by weight percentage is: Al:4.5 ~ 5.2%, Ga:2.5 ~ 6.8%, V:3.8 ~ 4.8%, and surplus is titanium and inevitable impurity.
As preferably, the intermediate alloy of described Ga, Al and V is Ti-Ga, Ti-Al and Ti-V intermediate alloy.
As preferably, in step (1), select titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum 1 ~ 6Pa.
As preferably, in described subzero treatment, the joint prosthesis semi-finished product after artificial aging insert deep cooling box, after first cooling to-69 ~-88 DEG C, after maintaining temperature 10 ~ 22min, continue to be cooled to-140 ~-180 DEG C, return to room temperature after maintaining temperature 26 ~ 30min.
Effect of the invention is that
:
1, process specific titanium alloy by reasonable heat treating regime so that what the performances such as the intensity of joint prosthesis, elastic modelling quantity all obtained increases substantially.
2, in heat treatment process, by arranging subzero treatment, and artificial aging process is set before subzero treatment, after annealing so that and even tissue, process by arranging solution treatment and artificial aging again after subzero treatment, after making the refinement of microstructure crystal grain and even tissue, strengthening intensity, after strengthening, the elastic modelling quantity that makes further is improved, so that the property indices of joint prosthesis is all better than existing joint prosthesis.
3, by the component of joint prosthesis material titanium alloy is carried out Reasonable adjustment, improve intensity by adding Ga in Ti-Al alloy, by Ga and V with the use of reaching corrosion resistance, and reach by arranging the content of each element rationally to coordinate with heat treatment and improve properties.
Detailed description of the invention
Embodiment
1
The heat treatment method of a kind of joint prosthesis, the material of described joint prosthesis is titanium alloy, and the composition of described titanium alloy content by weight percentage is: Al:4.9%, Ga:4.1%, V:4.1%, and surplus is titanium and inevitable impurity.Comprise the steps.
(1) raw material prepares and melting: selecting titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber that vacuum is 3Pa, using vacuum consumable electrode arc furnace to carry out twice melting is titanium ingot casting；This titanium ingot casting and Ti-Ga, Ti-Al and Ti-V intermediate alloy are joined in vacuum melting furnace jointly the melts of titanium alloy being smelted into required composition.
(2) hot investment casting: use the method for hot investment casting to obtain joint prosthesis semi-finished product after being incubated by the melt that step (1) obtains.
(3) annealing: be encased in vacuum induction heat-treatment furnace by the joint prosthesis semi-finished product that step (2) obtains and be heated to 560 DEG C, is incubated 45min, is heated to 660 DEG C, is incubated 26min, is heated to 770 DEG C, and after insulation 59min, air cooling is to room temperature.
(4) artificial aging: the joint prosthesis semi-finished product after step (3) being processed are inserted and are heated to 331 DEG C in aging furnace, are cooled to room temperature after being incubated 5 hours.
(5) subzero treatment: the joint prosthesis semi-finished product after artificial aging insert deep cooling box, cool to-160 DEG C, return to room temperature after subzero treatment 29min.
(6) solution treatment: insert in Solution Treatment Furnace by the joint prosthesis semi-finished product after subzero treatment, is heated to 850 DEG C, shrend after being incubated 1 hour.
(7) artificial aging for the second time: the joint prosthesis semi-finished product after solution treatment are inserted and is heated to 350 DEG C in aging furnace, be cooled to room temperature after being incubated 5 hours, i.e. obtain joint prosthesis finished product.
Embodiment
2
The heat treatment method of a kind of joint prosthesis, the material of described joint prosthesis is titanium alloy, and the composition of described titanium alloy content by weight percentage is: Al:5.0%, Ga:2.9%, V:4.0%, and surplus is titanium and inevitable impurity.
Comprise the steps:
(1) raw material prepares and melting: selecting titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum 0.8Pa, using vacuum consumable electrode arc furnace to carry out twice melting is titanium ingot casting；This titanium ingot casting and Ti-Ga, Ti-Al and Ti-V intermediate alloy are joined in vacuum melting furnace jointly the melts of titanium alloy being smelted into required composition.
(2) hot investment casting: use the method for hot investment casting to obtain joint prosthesis semi-finished product after being incubated by the melt that step (1) obtains.
(3) annealing: be encased in vacuum induction heat-treatment furnace by the joint prosthesis semi-finished product that step (2) obtains and be heated to 569 DEG C, is incubated 43min, is heated to 681 DEG C, is incubated 22min, is heated to 769 DEG C, and after insulation 58min, air cooling is to room temperature.
(4) artificial aging: the joint prosthesis semi-finished product after step (3) being processed are inserted and are heated to 345 DEG C in aging furnace, are cooled to room temperature after being incubated 4.8 hours.
(5) subzero treatment: the joint prosthesis semi-finished product after artificial aging insert deep cooling box, after first cooling to-81 DEG C, after maintaining temperature 19min, continues to cool to-160 DEG C, returns to room temperature after subzero treatment 28min.
(6) solution treatment: insert in Solution Treatment Furnace by the joint prosthesis semi-finished product after subzero treatment, is heated to 840 DEG C, shrend after being incubated 0.9 hour.
(7) artificial aging for the second time: the joint prosthesis semi-finished product after solution treatment are inserted and is heated to 351 DEG C in aging furnace, be cooled to room temperature after being incubated 5 hours, i.e. obtain joint prosthesis finished product.
Embodiment
3
A kind of joint prosthesis, described joint prosthesis uses the heat treatment method of embodiment 1 joint prosthesis to obtain, and the material of described joint prosthesis is titanium alloy, Fe≤0.10% in described titanium alloy impurity, C≤0.008%, N≤0.005%.Tensile strength 992MPa of described joint prosthesis, percentage elongation 22% after forging, the contraction percentage of area 46%, elastic modelling quantity is 68GPa.
Embodiment
4
A kind of joint prosthesis, described joint prosthesis uses the heat treatment method of embodiment 2 joint prosthesis to obtain, and the material of described joint prosthesis is titanium alloy, through measuring Fe:0.08% in described titanium alloy impurity, C:0.00:6%, N:0.006%.Tensile strength 1012MPa of described joint prosthesis, percentage elongation 21% after forging, the contraction percentage of area 48%, elastic modelling quantity is 72GPa.
Claims (5)
1. a joint prosthesis, the material of described joint prosthesis is titanium alloy, it is characterized in that, the composition of described titanium alloy content by weight percentage is: Al:4.5 ~ 5.2%, Ga:2.5 ~ 6.8%, V:3.8 ~ 4.8%, surplus is titanium and inevitable impurity, and Fe≤0.20% in impurity, C≤0.05%, N≤0.01%；
Preparation method comprises the steps:
(1) raw material prepares and melting: selecting titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum≤10Pa, using vacuum consumable electrode arc furnace to carry out twice melting is titanium ingot casting；The intermediate alloy of this titanium ingot casting Yu Ga, Al and V is joined in vacuum melting furnace jointly the melts of titanium alloy being smelted into required composition；
(2) hot investment casting: use the method for hot investment casting to obtain joint prosthesis semi-finished product after being incubated by the melt that step (1) obtains；
(3) annealing: the joint prosthesis semi-finished product that step (2) obtains are encased in vacuum induction heat-treatment furnace and are heated to 520 ~ 590 DEG C, insulation 40 ~ 50min, is heated to 620 ~ 690 DEG C, is incubated 20 ~ 30min, being heated to 750 ~ 780 DEG C, after insulation 55 ~ 65min, air cooling is to room temperature；
(4) artificial aging: the joint prosthesis semi-finished product after step (3) being processed are inserted and are heated to 310 ~ 360 DEG C in aging furnace, are cooled to room temperature after being incubated 4 ~ 6 hours；
(5) subzero treatment: the joint prosthesis semi-finished product after artificial aging insert deep cooling box, cools to-120 ~-180 DEG C, returns to room temperature after subzero treatment 25 ~ 35min；
(6) solution treatment: insert in Solution Treatment Furnace by the joint prosthesis semi-finished product after subzero treatment, is heated to 820 ~ 860 DEG C, shrend after being incubated 0.8 ~ 1.2 hour；
(7) artificial aging for the second time: the joint prosthesis semi-finished product after solution treatment are inserted and is heated to 320 ~ 360 DEG C in aging furnace, be cooled to room temperature after being incubated 4 ~ 6 hours, i.e. obtain joint prosthesis finished product.
Joint prosthesis the most according to claim 1, it is characterised in that the elastic modelling quantity of described joint prosthesis is 58 ~ 72GPa.
3. the heat treatment method of a joint prosthesis, it is characterised in that comprise the steps:
(1) raw material prepares and melting: selecting titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum≤10Pa, using vacuum consumable electrode arc furnace to carry out twice melting is titanium ingot casting；The intermediate alloy of this titanium ingot casting Yu Ga, Al and V is joined in vacuum melting furnace jointly the melts of titanium alloy being smelted into required composition；
(2) hot investment casting: use the method for hot investment casting to obtain joint prosthesis semi-finished product after being incubated by the melt that step (1) obtains；
(3) annealing: the joint prosthesis semi-finished product that step (2) obtains are encased in vacuum induction heat-treatment furnace and are heated to 520 ~ 590 DEG C, insulation 40 ~ 50min, is heated to 620 ~ 690 DEG C, is incubated 20 ~ 30min, being heated to 750 ~ 780 DEG C, after insulation 55 ~ 65min, air cooling is to room temperature；
(4) artificial aging: the joint prosthesis semi-finished product after step (3) being processed are inserted and are heated to 310 ~ 360 DEG C in aging furnace, are cooled to room temperature after being incubated 4 ~ 6 hours；
(5) subzero treatment: the joint prosthesis semi-finished product after artificial aging insert deep cooling box, cools to-120 ~-180 DEG C, returns to room temperature after subzero treatment 25 ~ 35min；
(6) solution treatment: insert in Solution Treatment Furnace by the joint prosthesis semi-finished product after subzero treatment, is heated to 820 ~ 860 DEG C, shrend after being incubated 0.8 ~ 1.2 hour；
(7) artificial aging for the second time: the joint prosthesis semi-finished product after solution treatment are inserted and is heated to 320 ~ 360 DEG C in aging furnace, be cooled to room temperature after being incubated 4 ~ 6 hours, i.e. obtain joint prosthesis finished product；
The material of described joint prosthesis is titanium alloy, and the composition of described titanium alloy content by weight percentage is: Al:4.5 ~ 5.2%, Ga:2.5 ~ 6.8%, V:3.8 ~ 4.8%, and surplus is titanium and inevitable impurity.
The heat treatment method of joint prosthesis the most according to claim 3, it is characterised in that the intermediate alloy of described Ga, Al and V is Ti-Ga, Ti-Al and Ti-V intermediate alloy.
5., according to the heat treatment method of the joint prosthesis described in claim 3 or 4, it is characterised in that in step (1), select titanium sponge as electrode, welding electrode in the vacuum plasma welding chamber of vacuum 1 ~ 6Pa.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610199025.8A CN105755413B (en) | 2015-04-14 | 2015-04-14 | A kind of heat treatment method of joint prosthesis |
| CN201510172954.5A CN104745870B (en) | 2015-04-14 | 2015-04-14 | A kind of joint prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510172954.5A CN104745870B (en) | 2015-04-14 | 2015-04-14 | A kind of joint prosthesis |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610199025.8A Division CN105755413B (en) | 2015-04-14 | 2015-04-14 | A kind of heat treatment method of joint prosthesis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104745870A CN104745870A (en) | 2015-07-01 |
| CN104745870B true CN104745870B (en) | 2016-09-07 |
Family
ID=53586117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510172954.5A Active CN104745870B (en) | 2015-04-14 | 2015-04-14 | A kind of joint prosthesis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104745870B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894433B (en) * | 2015-07-06 | 2017-03-22 | 于鹏东 | Tablet computer |
| CN104928532B (en) * | 2015-07-08 | 2017-03-29 | 东莞市渌通机械设备有限公司 | A kind of high-strength shell of mobile communication equipment |
| CN104911398B (en) * | 2015-07-08 | 2017-03-01 | 北京掌上维度科技股份有限公司 | A kind of handset shell |
| CN108374135B (en) * | 2018-03-30 | 2019-12-31 | 江苏大学 | Processing technology for improving strength and high-temperature stability of TC6 titanium alloy |
| CN112626431B (en) * | 2020-12-14 | 2022-08-23 | 湖南瀚德微创医疗科技有限公司 | Preparation method of prestressed bolt for medical ultrasonic transducer |
| CN115287561B (en) * | 2022-07-25 | 2023-10-20 | 武汉大学 | Titanium alloy heat treatment method and multi-scale multi-morphology precipitated phase structure prepared by same |
| CN115319061A (en) * | 2022-08-29 | 2022-11-11 | 上海交通大学医学院附属第九人民医院 | Titanium-gallium alloy cast ingot and preparation method and application thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768684A (en) * | 2008-12-26 | 2010-07-07 | 北京有色金属研究总院 | High temperature titanium alloy and surface modification method thereof |
| CN101724764B (en) * | 2009-12-10 | 2011-07-20 | 中南大学 | Process for preparing biomedical beta-titanium alloy |
| CN102453816A (en) * | 2010-10-26 | 2012-05-16 | 宝鸡瑞熙钛业有限公司 | Medical titanium alloy |
| FR2982618B1 (en) * | 2011-11-10 | 2014-08-01 | Institut Nat Des Sciences Appliquees De Rennes Insa De Rennes | METHOD FOR MANUFACTURING TITANIUM ALLOY FOR BIOMEDICAL DEVICES |
-
2015
- 2015-04-14 CN CN201510172954.5A patent/CN104745870B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104745870A (en) | 2015-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104745870B (en) | A kind of joint prosthesis | |
| CN103740982B (en) | A kind of low elastic modulus metastable Beta-titanium alloy and preparation method | |
| RU2544976C2 (en) | Titanium material | |
| JP2016516899A5 (en) | ||
| CN102146534A (en) | Low-elasticity high-strength near beta-type Ti-Nb-Ta-Zr alloy and preparation method of near beta-type Ti-Nb-Ta-Zr alloy | |
| CN102828122A (en) | Method for manufacturing stainless steel wire for spectacle frame | |
| CN115011840B (en) | Production method of beta-type titanium alloy bar for femoral stem human body implantation | |
| JP2010275606A (en) | Titanium alloy | |
| CN102151183B (en) | Method for preparing titanium alloy hip joint for surgery implantation | |
| CN103509959B (en) | A kind of preparation method of bio-medical low elastic modulus titanium tantalum niobium zirconium silicon alloy | |
| CN103667790A (en) | Heat treatment method for strong-strength titanium alloy | |
| EP3458619A1 (en) | Custom titanium alloy for 3-d printing and method of making same | |
| CN103695710A (en) | High-strength titanium alloy and preparation method thereof | |
| CN108070739A (en) | The preparation method of Ti-6Al-7Nb alloy cast ingots | |
| CN105755413B (en) | A kind of heat treatment method of joint prosthesis | |
| CN106119601A (en) | Alpha titanium alloy containing Fe, Cr, Zr alloying element and sheet material thereof and the preparation method of bar | |
| CN104862526B (en) | Artificial caput femoris and thermal treatment method thereof | |
| CN108456805A (en) | A kind of beta titanium alloy and its manufacturing method for being implanted into bone | |
| CN105369062A (en) | Material for making medical artificial joint | |
| JP5616845B2 (en) | Method for producing Co-based alloy for living body | |
| JP2005076098A (en) | HIGH-STRENGTH alpha-beta TITANIUM ALLOY | |
| CN106244833A (en) | A kind of preparation method containing magnesium alloy | |
| AU2023201949A1 (en) | Titanium based ceramic reinforced alloy | |
| US20140212688A1 (en) | High grade titanium alloy sheet and method of making same | |
| EP3655558A1 (en) | Custom titanium alloy, ti-64, 23+ |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Wei Inventor before: Zhang Gang |
|
| COR | Change of bibliographic data | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160810 Address after: 721000 Weibin District, Shaanxi, No. via road, No. 11 (Xin Bao building, room 2701), No. two Applicant after: Shaanxi medical Limited by Share Ltd Address before: 102218 Beijing City, Changping District Tian Tong Garden 40-1 Applicant before: Zhang Gang |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |