JPS63252681A - Work material for wrist watch band - Google Patents
Work material for wrist watch bandInfo
- Publication number
- JPS63252681A JPS63252681A JP62086315A JP8631587A JPS63252681A JP S63252681 A JPS63252681 A JP S63252681A JP 62086315 A JP62086315 A JP 62086315A JP 8631587 A JP8631587 A JP 8631587A JP S63252681 A JPS63252681 A JP S63252681A
- Authority
- JP
- Japan
- Prior art keywords
- base member
- watch band
- diffusion bonding
- processed material
- worked
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 51
- 210000000707 wrist Anatomy 0.000 title abstract 5
- 238000009792 diffusion process Methods 0.000 claims abstract description 25
- 238000003754 machining Methods 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 239000000956 alloy Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910009043 WC-Co Inorganic materials 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000000462 isostatic pressing Methods 0.000 abstract 1
- 238000001513 hot isostatic pressing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009760 electrical discharge machining Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Powder Metallurgy (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、腕時計のバンドを形成するのに用いられる
加工素材に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to processed materials used to form wristwatch bands.
［従来の技術および発明が解決しようとする問題点］
腕時計のバンドは傷つきやすい部分であるため硬質合金
により構成されていることが好ましい。[Prior Art and Problems to be Solved by the Invention] Since the band of a wristwatch is easily damaged, it is preferably made of a hard metal.
特に、高級な腕時計では超硬合金が時計バンド用素材と
して用いられている。In particular, cemented carbide is used as a material for watch bands in high-end watches.
しかしながら、超硬合金のような非常に硬い材質のもの
を時計バンド用素材として用いた場合、所望の形状に加
工することが困難である。すなわち、腕時計のバンドを
構成する部品は、ビンあるいはねじ等により相互に連結
されているものであるが、ビンやねじを挿通あるいは挿
入するための穴を形成しなければならない。超硬合金か
らなる時計バンド用素材の場合には、この穴加工は放電
加工により行なわれており、したがって加工に長時間を
要していた。However, when a very hard material such as cemented carbide is used as a material for a watch band, it is difficult to process it into a desired shape. That is, the parts constituting the wristwatch band are interconnected by bottles or screws, and holes must be formed through which the bottles or screws can be inserted. In the case of a watch band material made of cemented carbide, this hole machining is performed by electrical discharge machining, and therefore the machining takes a long time.
他方、腕時計用バンド用部品を超硬合金で形成するに際
し、予め上記のような穴ををするように部品を成形する
ことも考えられる。しかしながら、予め所望径の穴を有
するような形状に成形した場合には、十分な寸法精度を
得ることができない。On the other hand, when forming a wristwatch band component from cemented carbide, it is also conceivable to form the component in advance so as to form a hole as described above. However, if the material is preformed into a shape having a hole of a desired diameter, sufficient dimensional accuracy cannot be obtained.
よって、この発明の目的は、傷のつきにくい超硬合金を
用いながらも機械加工性に優れかつ安価に製造し得る時
計バンド用加工素材を提供することにある。Therefore, an object of the present invention is to provide a processed material for a watch band that uses scratch-resistant cemented carbide, has excellent machinability, and can be manufactured at low cost.
［問題点を解決するための手段および作用］この発明の
時計バンド用加工素材では、加工部がベース部材よりも
機械加工性の優れた被加工材からなり、かつ該被加工材
がベース部材に拡散接合により接合されている。[Means and effects for solving the problems] In the processed material for a watch band of the present invention, the processed part is made of a workpiece material that has better machinability than the base member, and the workpiece material is made of a workpiece material that has better machinability than the base member. Bonded by diffusion bonding.
したがって、この発明の時計バンド用加工素材の加工部
は、機械加工容易であり、高精度に加工することができ
る。よって、従来のような長時間の放電加工作業を要し
ない。Therefore, the processed portion of the processed material for a watch band of the present invention can be easily machined and processed with high precision. Therefore, there is no need for a long electrical discharge machining operation as in the conventional method.
また、被加工材は拡散接合によりベース部材に接合され
ている。したがって、ベース部材を焼結する際に被加工
材のベース部材に対する接合も同時に行なうことができ
る。よって、素材の製造工程を慢雑にすることもない。Further, the workpiece is joined to the base member by diffusion bonding. Therefore, when the base member is sintered, the workpiece can be joined to the base member at the same time. Therefore, the manufacturing process of the material does not become complicated.
この発明において、被加工材はベース部材よりも機械加
工性の優れた材料が用いられる。ベース部材が超硬合金
からなる場合には、周期律表■、■もしくは■族の金属
または該金属２種以上の合金からなる被加工材が好まし
い。特に、超硬合金がＷＣ−Ｃｏ系超硬合金である場合
には、被加工材として、Ｍｏ、ＷまたはＴａが好ましく
中でもＭ ｏが接合強度の面から推奨される。また、超
硬合金がＴａＣ−Ｎｉ系超硬合金である場合には、Ｍｏ
またはＷ−Ｎｉ系合金が好ましく、中でもＷ−Ｎｉ系合
金が接合強度の面から推奨される。In this invention, a material having better machinability than the base member is used as the workpiece. When the base member is made of cemented carbide, it is preferable to use a workpiece made of a metal belonging to the ■, ■, or ■ groups of the periodic table, or an alloy of two or more of these metals. In particular, when the cemented carbide is a WC-Co based cemented carbide, Mo, W or Ta is preferred as the workpiece material, with Mo being recommended from the viewpoint of bonding strength. In addition, when the cemented carbide is a TaC-Ni based cemented carbide, Mo
Alternatively, a W-Ni alloy is preferable, and a W-Ni alloy is particularly recommended from the viewpoint of bonding strength.
この発明の拡散接合としては、焼結拡散接合または熱間
静水圧プレス（ＨＩ Ｐ）拡散接合が、製造工程の面か
ら推奨される。焼結拡散接合およびＨＩＰ拡散接合は併
用させてもよい。併用させる場合、焼結拡散接合を行な
った後にＨＩＰ拡散接合を行なってもよく、あるいは焼
結拡散接合およびＨＩＰ拡散接合を同時に行なってもよ
い。As the diffusion bonding of the present invention, sintering diffusion bonding or hot isostatic pressing (HIP) diffusion bonding is recommended from the viewpoint of the manufacturing process. Sintering diffusion bonding and HIP diffusion bonding may be used together. When used in combination, HIP diffusion bonding may be performed after sintering diffusion bonding, or sintering diffusion bonding and HIP diffusion bonding may be performed simultaneously.
たとえば、焼結前のベース部材に既に焼結した被加工材
を密着させ、この状態でベース部材を焼結させ、次にＨ
ＩＰ成形させてもよい。また、焼結前のベース部材に焼
結前の被加工材を密着させた状態でベース部材および被
加工材を同時に焼結させ、次にＨＩＰ成形することもで
きる。さらに、他の方法として、既に焼結したベース部
材に、同じく既に焼結した被加工材を密着させ、再焼結
した後にＨＩＰ成形させることもできる。For example, an already sintered workpiece is brought into close contact with a base member before sintering, the base member is sintered in this state, and then H
IP molding may also be performed. Further, it is also possible to sinter the base member and the workpiece at the same time in a state where the workpiece before sintering is in close contact with the base member before sintering, and then perform HIP molding. Furthermore, as another method, an already sintered workpiece may be brought into close contact with an already sintered base member, and HIP molding may be performed after resintering.
なお、拡散接合の際に、接合界面において被加工材の炭
化物が生成し、この炭化物の生成により接合強度の高め
られることが考えられる。Note that during diffusion bonding, carbide of the workpiece material is generated at the bonding interface, and it is thought that the bonding strength is increased by the generation of this carbide.
［実施例］
第１図および第２図は、この発明の一実施例の時計バン
ド用加工素材の正面断面図および側面図である。図示の
時計バンド用加工索材１では、超硬合金よりなるベース
部材２に形成された穴内に被加工材３が埋込まれている
。この時計バンド用加工索材１は、焼結前のベース部材
２の穴に既に焼結した被加工材３を埋込み、ベース部材
２を焼結した後にＨＩＰ成形して得られたものである。[Example] FIGS. 1 and 2 are a front sectional view and a side view of a processed material for a watch band according to an example of the present invention. In the illustrated processed cable material 1 for a watch band, a processed material 3 is embedded in a hole formed in a base member 2 made of cemented carbide. This processed rope material 1 for a watch band is obtained by embedding a sintered workpiece 3 into a hole in a base member 2 before sintering, sintering the base member 2, and then performing HIP molding.
ベース部材２および被加工材３として、下記の表に示す
材料を組合わせて種々作製した。得られた時計バンド用
加工索材１の加工部に、第３図および第４図に示すよう
に穴５を機械加工より形成し、その際の加工性を指数と
して評価した。評価としては、加工工程およびその加工
能力より算出した。Various base members 2 and workpieces 3 were prepared by combining materials shown in the table below. As shown in FIGS. 3 and 4, holes 5 were formed by machining in the processed portion of the obtained processed rope material 1 for watch bands, and the workability at that time was evaluated as an index. The evaluation was calculated based on the processing process and its processing ability.
加工工程は、ドリル切削による穴加工の加工能力の平均
値を指数として表わした。For the machining process, the average value of the machining ability of hole machining by drilling was expressed as an index.
なお、下記の表は比較例として被加工材３の接合されて
いない、すなわち穴の形成されていないベース部材２を
穴加工したときの加工性指数についても評価した結果を
併せて示した。評価は、上記と同様に加工工程およびそ
の加工能力により算出した。加工工程は、放電加工によ
る穴の形成と、その工程の加工能力の平均値を指数とし
て表わした。The table below also shows, as a comparative example, the results of evaluating the workability index when drilling holes in the base member 2 to which the workpiece 3 is not joined, that is, in which no holes are formed. The evaluation was calculated based on the processing process and its processing ability in the same manner as above. For the machining process, the average value of the hole formation by electric discharge machining and the machining ability of that process was expressed as an index.
（以下余白）
なお、上述した実施例では、時計バンド用加工素材１に
、貫通孔が形成されており、該貫通孔内に被加工材３が
充填されていたが、加工素材１の長手方向両端から中心
に向かって貫通孔でない穴を形成し、該穴内に被加工材
を充填し、該被加工材にそれぞれ穴を形成して長手方向
両端にピンが挿入される構成としてもよい。同様に、被
加工材の充填される穴の断面形状についても、図示のよ
うに円形に限らず、四角形など任意の形状とし得ること
も言うまでもない。(The following is a blank space.) In the above-mentioned embodiment, a through hole was formed in the watch band processing material 1, and the through hole was filled with the workpiece material 3, but in the longitudinal direction of the processing material 1. A structure may also be adopted in which holes other than through holes are formed from both ends toward the center, the holes are filled with workpieces, holes are formed in each of the workpieces, and pins are inserted into both ends in the longitudinal direction. Similarly, it goes without saying that the cross-sectional shape of the hole filled with the workpiece material is not limited to a circular shape as shown in the drawings, but may be any shape such as a rectangular shape.
［発明の効果］
以上のように、この発明の時計バンド用加工素材の加工
部は、機械加工性に優れた被加工材が拡散接合により接
合されており、被加工材がベース部材よりも機械加工性
に優れているため、機械加工が容易であり、よって寸法
精度に優れた時計用バンド部品を得ることができる。ま
た、従来のように放電加工を行なう必要がなく、通常の
機械加工により加工部を加工し得るので、加工時間を大
巾に短縮することができる。[Effects of the Invention] As described above, in the processed part of the processed material for a watch band of the present invention, workpieces with excellent machinability are joined by diffusion bonding, and the workpiece is more easily machined than the base member. Since it has excellent workability, machining is easy, and therefore a watch band component with excellent dimensional accuracy can be obtained. In addition, there is no need to perform electric discharge machining as in the conventional method, and the machined portion can be machined by normal machining, so that the machining time can be significantly shortened.
さらに、被加工材は拡散接合により接合されているため
、ベース部材を焼結あるいはＨＩＰ成形する際に、被加
工材をベース部材に接合させることができる。よって、
製造工程を複雑化することもない。Furthermore, since the workpieces are joined by diffusion bonding, the workpiece can be joined to the base member when the base member is sintered or HIP-molded. Therefore,
There is no need to complicate the manufacturing process.
第１図はこの発明の一実施例の時計バンド用加工素材の
正面断面図、第２図は側面図、第３図は第１図実施例に
穴を加工した状態を示す正面断面図、第４図はその側面
図である。
図において、１は時計バンド用加工素材、２はベース部
材、３は被加工材を示す。
特許出願人 並木精密宝石株式会社
（ほか２名 −Ｌ゛′−゛−
第３図
第２図
第４図1 is a front sectional view of a processed material for a watch band according to an embodiment of the present invention, FIG. 2 is a side view, and FIG. 3 is a front sectional view showing a state in which holes have been machined in the embodiment of FIG. Figure 4 is its side view. In the figure, 1 is a processed material for a watch band, 2 is a base member, and 3 is a processed material. Patent applicant Namiki Precision Jewelry Co., Ltd. (and 2 others -L゛'-゛- Figure 3 Figure 2 Figure 4
Claims (9)
品に仕上げられる時計バンド用加工素材であって、 前記加工部が、残りのベース部材より機械加工性の優れ
た被加工材よりなり、かつ該被加工材がベース部材に拡
散接合により接合されていることを特徴とする時計バン
ド用加工素材。(1) A processed material for a watch band that is finished into a watch band component by machining a processed part, wherein the processed part is made of a workpiece material that has better machinability than the rest of the base member, and A processed material for a watch band, characterized in that the processed material is joined to a base member by diffusion bonding.
する特許請求の範囲第１項記載の時計バンド用加工素材
。(2) The processed material for a watch band according to claim 1, wherein the base member is made of cemented carbide.
を特徴とする特許請求の範囲第２項記載の時計バンド用
加工素材。(3) The processed material for a watch band according to claim 2, wherein the cemented carbide is a WC-Co based cemented carbide.
とを特徴とする特許請求の範囲第２項記載の時計バンド
用加工素材。(4) The processed material for a watch band according to claim 2, wherein the cemented carbide is a TaC-Ni based cemented carbide.
属または該金属の２種以上の合金からなることを特徴と
する特許請求の範囲第１項〜第４項のいずれかに記載の
時計バンド用加工素材。(5) Any one of claims 1 to 4, wherein the workpiece is made of a metal of group IV, V or VI of the periodic table, or an alloy of two or more of the metals. Processed material for watch bands listed.
する特許請求の範囲第１項〜第５項のいずれかに記載の
時計バンド用加工素材。(6) The processed material for a watch band according to any one of claims 1 to 5, wherein the diffusion bonding is sintering diffusion bonding.
とする特許請求の範囲第１項〜第５項のいずれかに記載
の時計バンド用加工素材。(7) The processed material for a watch band according to any one of claims 1 to 5, wherein the diffusion bonding is HIP diffusion bonding.
ことによりなされる拡散接合であることを特徴とする特
許請求の範囲第１項〜第５項のいずれかに記載の時計バ
ンド用加工素材。(8) The processed material for a watch band according to any one of claims 1 to 5, wherein the diffusion bonding is a diffusion bonding performed by sequentially performing sintering and HIP. .
うことによりなされる拡散接合であることを特徴とする
特許請求の範囲第１項〜第５項のいずれかに記載の時計
バンド用加工素材。(9) The processed material for a watch band according to any one of claims 1 to 5, wherein the diffusion bonding is a diffusion bonding performed by simultaneously performing sintering and HIP. .
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62086315A JPS63252681A (en) | 1987-04-08 | 1987-04-08 | Work material for wrist watch band |
| EP88105412A EP0286948B1 (en) | 1987-04-08 | 1988-04-05 | Workpiece for a watch band |
| DE8888105412T DE3873585T2 (en) | 1987-04-08 | 1988-04-05 | WORKPIECE FOR A BRACELET. |
| KR1019880003958A KR920001630B1 (en) | 1987-04-08 | 1988-04-08 | Work material for a watch band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62086315A JPS63252681A (en) | 1987-04-08 | 1987-04-08 | Work material for wrist watch band |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63252681A true JPS63252681A (en) | 1988-10-19 |
| JPH039832B2 JPH039832B2 (en) | 1991-02-12 |
Family
ID=13883399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62086315A Granted JPS63252681A (en) | 1987-04-08 | 1987-04-08 | Work material for wrist watch band |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0286948B1 (en) |
| JP (1) | JPS63252681A (en) |
| KR (1) | KR920001630B1 (en) |
| DE (1) | DE3873585T2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9001409D0 (en) * | 1990-04-20 | 1990-04-20 | Sandvik Ab | METHOD FOR MANUFACTURING OF CARBON METAL BODY FOR MOUNTAIN DRILLING TOOLS AND WEARING PARTS |
| GB9720059D0 (en) * | 1997-09-19 | 1997-11-19 | Isis Innovation | Method of bonding |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56128688A (en) * | 1980-03-11 | 1981-10-08 | Kobe Steel Ltd | Diffused junction method of materials of different kinds of metal |
| JPS6071247A (en) * | 1983-09-28 | 1985-04-23 | セイコーエプソン株式会社 | Sheathed part for watch |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5330352B2 (en) * | 1971-12-14 | 1978-08-26 | ||
| SE440753B (en) * | 1983-05-13 | 1985-08-19 | Santrade Ltd | CUTTING PROCESSING TOOLS EXISTING CORE AND WRAP |
| JPS627802A (en) * | 1985-07-03 | 1987-01-14 | Kubota Ltd | Composite ring and its production |
-
1987
- 1987-04-08 JP JP62086315A patent/JPS63252681A/en active Granted
-
1988
- 1988-04-05 EP EP88105412A patent/EP0286948B1/en not_active Expired - Lifetime
- 1988-04-05 DE DE8888105412T patent/DE3873585T2/en not_active Expired - Lifetime
- 1988-04-08 KR KR1019880003958A patent/KR920001630B1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56128688A (en) * | 1980-03-11 | 1981-10-08 | Kobe Steel Ltd | Diffused junction method of materials of different kinds of metal |
| JPS6071247A (en) * | 1983-09-28 | 1985-04-23 | セイコーエプソン株式会社 | Sheathed part for watch |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH039832B2 (en) | 1991-02-12 |
| DE3873585T2 (en) | 1992-12-10 |
| KR880012788A (en) | 1988-11-29 |
| EP0286948A2 (en) | 1988-10-19 |
| EP0286948A3 (en) | 1989-12-06 |
| KR920001630B1 (en) | 1992-02-21 |
| DE3873585D1 (en) | 1992-09-17 |
| EP0286948B1 (en) | 1992-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |