JPH0610956B2 - Method for manufacturing cathode substrate of impregnated cathode - Google Patents
Method for manufacturing cathode substrate of impregnated cathodeInfo
- Publication number
- JPH0610956B2 JPH0610956B2 JP3251352A JP25135291A JPH0610956B2 JP H0610956 B2 JPH0610956 B2 JP H0610956B2 JP 3251352 A JP3251352 A JP 3251352A JP 25135291 A JP25135291 A JP 25135291A JP H0610956 B2 JPH0610956 B2 JP H0610956B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- sintered body
- resistant
- rod
- heat
- 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
- 238000000034 method Methods 0.000 title claims description 26
- 239000000758 substrate Substances 0.000 title claims description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 239000008188 pellet Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000003870 refractory metal Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000005304 joining Methods 0.000 claims 1
- 239000000843 powder Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
- H01J9/047—Cathodes having impregnated bodies
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は高密度の陰極構造体に必
要な含浸型陰極構造体の製造に関するもので、特に含浸
型陰極構造体に設置される陰極基体の製造方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an impregnated cathode structure required for a high density cathode structure, and more particularly to a method for manufacturing a cathode substrate installed in the impregnated cathode structure.
【０００２】[0002]
【従来の技術】含浸型陰極構造体は耐熱性の多孔質の焼
結体のペレットと耐熱性の陰極リングとから構成され、
上記陰極の一部として形成された密閉キャップ形のスリ
ーブの上部面に設置される陰極基体とから成される。2. Description of the Related Art An impregnated cathode structure is composed of heat-resistant porous sintered pellets and a heat-resistant cathode ring.
The cathode base is mounted on the upper surface of a closed cap type sleeve formed as a part of the cathode.
【０００３】一般に、高密度を要求するオシロスコープ
応用器機は含浸型陰極構造体を使用しており、現代のテ
レビジョン受像機は高精細化・大型化バルブに適用され
るように電子管に含浸型陰極管を使用する傾向である。Generally, an oscilloscope application device which requires high density uses an impregnated cathode structure, and a modern television receiver is an impregnated cathode for an electron tube so as to be applied to a high-definition and large-sized bulb. They tend to use tubes.
【０００４】従来、陰極はヒータを取り囲む酸化物の被
覆陰極からなり、その上部が密閉され、酸化物で被覆さ
れる。Conventionally, the cathode consists of an oxide coated cathode surrounding the heater, the top of which is sealed and coated with oxide.
【０００５】他の実施例はヒータを取り囲んでいるスリ
ーブ、上部を密閉するキャップとインジウム添加剤で作
った電子放射物質層とから構成されて高電流密度がブラ
ウン管の高輝度および解像度を達成するようにする。こ
れはインジウム添加型の酸化物陰極という。大部分の陰
極はグリッドマウントまたはグリッドによって支持され
るが、陰極の表面はグリッドアパーチャ（Ａｐｅｒｔｕ
ｒｅ）と所定の間隔に維持されなければならない電子層
がグリッドアパーチャを通じて陰極から高密度の電流を
得ることができる。Another embodiment consists of a sleeve surrounding the heater, a cap that encloses the top and an electron emissive material layer made of indium additive so that a high current density achieves the high brightness and resolution of a cathode ray tube. To This is called an indium-added type oxide cathode. Most cathodes are supported by a grid mount or grid, but the surface of the cathode is the grid aperture (Apertu).
re) and the electronic layer, which must be maintained at a predetermined distance, can obtain a high current density from the cathode through the grid aperture.
【０００６】このように陰極の密閉された上部面とグリ
ッドアパーチャとの間の所定の距離の確保は大変重要で
ある。所定の間隙がそれらの間に維持されると仮定する
と密閉陰極またはインジウム添加型の酸化物の陰極は諸
性能を発揮することができる。Thus, it is very important to secure a predetermined distance between the closed upper surface of the cathode and the grid aperture. Closed cathodes or indium-doped oxide cathodes can perform well, provided that a predetermined gap is maintained between them.
【０００７】従来の含浸型陰極構造体は添附されている
図面の図１においてのように電子放射物質が含浸された
多孔質の耐熱性の焼結体のペレット１Ａを両端が開口さ
れた耐熱性金属の円筒形陰極リング２Ａ内に定着させて
陰極基体Ａを構成し、上端が閉鎖された閉鎖面３１を具
備した陰極スリーブ３Ａの閉鎖面３１に上記陰極基体Ａ
を付着結合させた構成の含浸型陰極構造体をもって陰極
スリーブ３Ａの内部には陰極加熱用ヒータ４が挿入設置
されている。A conventional impregnated cathode structure is attached with a pellet 1A of a porous heat-resistant sintered body impregnated with an electron emitting material as shown in FIG. 1 of the accompanying drawings. The cathode substrate A is fixed in a metal cylindrical cathode ring 2A to form a cathode substrate A, and the cathode substrate A is attached to a closed surface 31 of a cathode sleeve 3A having a closed surface 31 having a closed upper end.
The cathode heating heater 4 is inserted and installed inside the cathode sleeve 3A with the impregnated cathode structure having a structure in which is adhered and bonded.
【０００８】上記のような含浸型陰極の製造方法は微細
粉末からなったタングステン（Ｗ）粉末を耐熱性の金属
粉末とし、プレス工程および水素または真空雰囲気の中
で高温焼結して理論的な密度が約８０％以上になるよう
に多孔質の耐熱性の焼結体を製造する。このとき、多孔
質の耐熱性の焼結体の理論的な密度が高いのは多孔質の
耐熱性の焼結体に一般的に電子放射物質であるＢａＯ，
ＣａＯ，Ａｌ2 Ｏ3 が含浸され、陰極が完成された後に
動作中における電子放射物質の蒸発を抑制させるための
ものである。In the method of manufacturing the impregnated cathode as described above, a tungsten (W) powder made of fine powder is used as a heat-resistant metal powder, and a theoretical process is carried out by high-temperature sintering in a pressing process and hydrogen or a vacuum atmosphere. A porous heat-resistant sintered body is manufactured so that the density is about 80% or more. At this time, the theoretical density of the porous heat-resistant sintered body is high because the porous heat-resistant sintered body is made of BaO, which is generally an electron emitting substance.
The purpose is to suppress evaporation of the electron emitting material during operation after the cathode is completed by being impregnated with CaO and Al 2 O 3 .
【０００９】上記のように多孔質の耐熱性の焼結体が仕
上げられると多孔質の耐熱性の焼結体の空隙部に電子放
射物質を含浸させ、機械的な加工工程等を通じて外周面
に耐熱性金属が陰極リング２Ａを具備した陰極基体Ａを
構成する。When the porous heat-resistant sintered body is finished as described above, the voids of the porous heat-resistant sintered body are impregnated with the electron-emitting substance, and the outer peripheral surface is subjected to a mechanical working process or the like. The refractory metal constitutes the cathode substrate A having the cathode ring 2A.
【００１０】図２は上記含浸型陰極構造体における含浸
型陰極の陰極基体Ａの製造方法を図示しているもので、
上記の含浸型陰極の陰極基体Ａは図２（イ）の工程のよ
うにモリブデン等の耐熱性金属からなった金属円筒体Ａ
１をプレスまたはディップドローイング方法によって備
えており、図２（ロ）の工程においては銅（Ｃｕ）また
はプラスチックが含浸され、多孔質のタングステン等の
多孔質の耐熱性の金属粉末からなった棒状焼結体Ａ２を
プレス工程および高温の焼結工程、そして銅（またはプ
ラスチック）を含浸する工程によって製造した後に
（ハ）の工程のように上記の金属円筒体Ａ１が内部面に
密着挿入されることができるように機械的な加工を行な
う。以後に、上記金属円筒体Ａ１に棒状焼結体Ａ２が進
入されて挿入密着されるとレーザースポット溶接（ａ）
の方法によって個別的に金属円筒体Ａ１と棒状焼結体Ａ
２を固定接合し、切断面Ｃを加工し、所定の長さ（例え
ば、０．５mm）に切断する工程が順次的に金属円筒体Ａ
１と棒状焼結体Ａ２から同時に加工製造されて陰極基体
Ａの形状に製造し、銅（またはプラスチック）を分解し
た後に電子放射物質を含浸する。FIG. 2 illustrates a method of manufacturing the cathode substrate A of the impregnated type cathode in the impregnated type cathode structure.
The cathode base A of the above-mentioned impregnated cathode is a metal cylinder A made of a heat-resistant metal such as molybdenum as in the step of FIG.
1 is provided by a press or dip drawing method, and in the step of FIG. 2B, rod-shaped baking made of porous heat-resistant metal powder such as porous tungsten is impregnated with copper (Cu) or plastic. After the assembly A2 is manufactured by a pressing step, a high temperature sintering step, and a step of impregnating copper (or plastic), the metal cylinder A1 is closely inserted into the inner surface as in the step (c). Perform mechanical processing so that After that, when the rod-shaped sintered body A2 is inserted into the metal cylinder A1 and is inserted and adhered thereto, laser spot welding (a) is performed.
The metal cylinder A1 and the rod-shaped sintered body A are individually manufactured by the method of
2 is fixedly joined, the cut surface C is processed, and the process of cutting to a predetermined length (for example, 0.5 mm) is performed sequentially by the metal cylinder A.
1 and the rod-shaped sintered body A2 are simultaneously processed and manufactured into the shape of the cathode base A, and copper (or plastic) is decomposed and then impregnated with an electron emitting material.
【００１１】[0011]
【発明が解決しようとする課題】このような含浸型陰極
の製造方法は陰極基体Ａのそのものの性能を向上させる
のに効果を示しているが、レーザースポット溶接
（ａ）、切断面（ｃ）の加工、所定の長さに切断する工
程等の各種の工程が順次的に行なわれなければならな
い。このことは、精密にしなければならないという負担
の下で陰極基体を製造するに当たり数多な問題を生じさ
せる。The method of manufacturing the impregnated cathode as described above is effective in improving the performance of the cathode substrate A itself, but laser spot welding (a) and cut surface (c) are required. The various processes such as the process of 1) and the process of cutting into a predetermined length must be sequentially performed. This gives rise to a number of problems in manufacturing the cathode substrate under the burden of having to be precise.
【００１２】本発明は改善された陰極基体を有する含浸
型陰極構造体を提供することを目的とする。The present invention seeks to provide an impregnated cathode structure having an improved cathode substrate.
【００１３】本発明のまた他の目的は減少された工程を
通じて製造された陰極基体を提供することに関するもの
であり、また他の一つの目的は陰極基体を製造する方法
を提供することにある。Another object of the present invention is to provide a cathode substrate manufactured through a reduced process, and another object of the present invention is to provide a method of manufacturing the cathode substrate.
【００１４】[0014]
【課題を解決するための手段】本発明は含浸型陰極構造
体に関するもので、同一の軸状に細装された長い長さを
有するロッド形の焼結体を耐熱金属の金属円筒体に挿入
し、それらをレーザーライン溶接を通じてそれらの現状
態下に相互に結合させ、所定の間隔にそれらを設置する
段階から成される。SUMMARY OF THE INVENTION The present invention relates to an impregnated type cathode structure, in which a rod-shaped sintered body having a long length, which is finely mounted on the same shaft, is inserted into a metal cylinder of a refractory metal. Then, they are connected to each other under their existing conditions through laser line welding, and they are installed at predetermined intervals.
【００１５】[0015]
【実施例】以下、本発明を添附の図面に基づいて詳細に
説明する。The present invention will be described in detail below with reference to the accompanying drawings.
【００１６】図３を参照して本発明をより詳細に説明す
ると、次のようである。The present invention will be described in more detail with reference to FIG.
【００１７】電子放射物質と多孔質の耐熱性の焼結体か
らなったペレット１Ａが両端が開口された円筒形金属の
陰極リング２Ａの内部に固定付着されて陰極基体Ａを構
成し、図３（イ）の工程のようにモリブデン等の耐熱性
金属からなった金属円筒体Ａ１をプレスまたはディップ
ドローイング方法によって備えており、図３（ロ）の工
程においては多孔質のタングステン等の多孔質の耐熱性
の金属粉末からなった棒状焼結体Ａ２をプレス工程およ
び高温の焼結工程を通じて製造する。A pellet 1A made of an electron emitting material and a porous heat-resistant sintered body is fixedly attached to the inside of a cylindrical metal cathode ring 2A having openings at both ends to form a cathode substrate A, as shown in FIG. As in the step (a), a metal cylinder A1 made of a heat-resistant metal such as molybdenum is provided by a press or dip drawing method, and in the step of FIG. A rod-shaped sintered body A2 made of heat-resistant metal powder is manufactured through a pressing process and a high-temperature sintering process.
【００１８】本発明における棒状焼結体Ａ２は多孔質の
耐熱性の粉末のみで構成させることができ、銅（Ｃｕ）
またはプラスチックを多孔質の耐熱性の焼結体の空隙部
に含浸させて切断および加工を容易にする方法、また電
子放射物質を多孔質の耐熱性の焼結体の空隙部に含浸さ
せて棒状焼結体を構成させる方法がある。The rod-shaped sintered body A2 in the present invention can be constituted only by porous heat-resistant powder, and is made of copper (Cu).
Alternatively, a method of impregnating the voids of a porous heat-resistant sintered body with plastic to facilitate cutting and processing, or impregnating the voids of a porous heat-resistant sintered body with an electron-emitting substance to form a rod shape There is a method of forming a sintered body.
【００１９】上記のように図３（イ）の工程における金
属円筒体Ａ１と図３（ロ）の工程における棒状焼結体Ａ
２が製造されると図３（ハ）の工程において示すように
所定の外径（例えば、１．４mm）をもつように棒状焼結
体Ａ２を加工し、棒状焼結体Ａ２を金属円筒体Ａ１の内
部に密着挿入させる。As described above, the metal cylinder A1 in the step of FIG. 3A and the rod-shaped sintered body A in the step of FIG.
2 is manufactured, the rod-shaped sintered body A2 is processed to have a predetermined outer diameter (for example, 1.4 mm) as shown in the step of FIG. Insert tightly inside A1.
【００２０】図３（ニ）の工程は棒状焼結体Ａ２が金属
円筒体Ａ１の内部に密着挿入された状態でレーザーライ
ン溶接（ｄ）によって連続的に棒状焼結体Ａ２と金属円
筒体Ａ１が固定付着され、所定の長さに切断（ｂ）し、
切断面（ｃ）を順次的に加工しながらペレット１Ａと陰
極リング２Ａとから構成される陰極基体Ａを製造するも
のである。In the step shown in FIG. 3D, the rod-shaped sintered body A2 and the metal cylindrical body A1 are continuously connected by laser line welding (d) in a state where the rod-shaped sintered body A2 is closely inserted into the metal cylindrical body A1. Is fixedly attached and cut (b) to a predetermined length,
The cathode substrate A composed of the pellet 1A and the cathode ring 2A is manufactured by sequentially processing the cut surface (c).
【００２１】上記のように製造された陰極基体Ａは閉鎖
面３１を具備した陰極スリーブ３Ａの閉鎖面３１に付着
結合されて含浸型陰極を構成する。The cathode substrate A manufactured as described above is adhesively bonded to the closed surface 31 of the cathode sleeve 3A having the closed surface 31 to form an impregnated cathode.
【００２２】[0022]
【発明の効果】したがって、本発明は棒状焼結体Ａ２を
金属円筒体Ａ１の内部に密着挿入させ、レーザーライン
溶接方法（ｄ）によって棒状焼結体Ａ２と金属円筒体Ａ
１を連続的に固定付着するので、ペレット１Ａの個々の
レーザースポット溶接に比べて含浸型陰極製造工程がず
っと短縮される大変有用なものである。According to the present invention, therefore, the rod-shaped sintered body A2 is closely inserted into the metal cylinder A1 and the rod-shaped sintered body A2 and the metal cylinder A are processed by the laser line welding method (d).
Since 1 is continuously fixed and adhered, the impregnation type cathode manufacturing process is much shortened as compared with the individual laser spot welding of the pellet 1A, which is very useful.
【図１】含浸型陰極構造体の縦断面図である。FIG. 1 is a vertical sectional view of an impregnated-type cathode structure.
【図２】従来の含浸型陰極の製造方法を図示した参考図
である。FIG. 2 is a reference diagram illustrating a conventional method for manufacturing an impregnated cathode.
【図３】本発明の含浸型陰極の製造方法を図示した参考
図である。FIG. 3 is a reference diagram illustrating a method for manufacturing an impregnated cathode of the present invention.
Ａ１ 金属円筒体 Ａ２ 棒状焼結体 １Ａ ペレット ２Ａ 陰極リング Ａ 陰極基体 A1 metal cylinder A2 rod-shaped sintered body 1A pellet 2A cathode ring A cathode substrate
Claims (3)
金属の陰極リング内に挿入された多孔質の耐熱性のペレ
ットを具備した陰極基体とから構成される含浸型陰極の
陰極基体の製造方法において、全ての長さにわたって細
装されたロッド形の焼結体を耐熱性のパイプ形の金属円
筒体内に挿入する段階と、ロッド形の焼結体をそれらの
全ての長さにわたってレーザー溶接によって金属円筒体
と結合させる段階と、その結合されたロッド形の焼結体
と金属円筒体を所定の長さに切断して陰極基体を形成す
る段階とから成された陰極基体の製造方法。1. A cathode substrate of an impregnated-type cathode comprising a cathode structure and a cathode substrate having porous heat-resistant pellets inserted in a cathode ring made of a heat-resistant metal whose both ends are open. In the manufacturing method, a step of inserting a rod-shaped sintered body, which has been finely cut all over the length, into a heat-resistant pipe-shaped metal cylinder, and a method of laser-producing the rod-shaped sintered body over all the lengths thereof. A method of manufacturing a cathode substrate, which comprises the steps of joining to a metal cylindrical body by welding, and the step of forming the cathode substrate by cutting the joined rod-shaped sintered body and the metal cylindrical body into a predetermined length. .
極基体の上部の表面上に固定すると同時に遂行されるよ
うにしたことを特徴とする請求項１に記載の陰極基体の
製造方法。2. The method of claim 1, wherein the bonding and cutting steps are performed simultaneously with fixing the cathode substrate on the upper surface of the cathode substrate.
金属の陰極リング内に挿入された多孔質の耐熱性のペレ
ットを具備した陰極基体とから成された含浸型陰極にお
いて、モリブデンのような耐熱性の金属円筒体がプレス
またはディップドローイング方法で製造され、多孔質の
耐熱性のロッド形の焼結体がプレス工程および高温の焼
結工程を通じて製造され、銅およびプラスチック剤が多
孔質の耐熱性の焼結体の空隙内に含浸されてロッド形の
焼結体の切断および加工を容易にする工程、電子放射物
質を多孔性の焼結体の空隙部に含浸させる工程、および
多孔性の耐熱性の焼結体のみで多孔性の耐熱性のロッド
形の焼結体を製造しながら、ロッド形の焼結体が円筒構
造体に挿入され、これらがレーザーライン溶接を通じて
相互に結合され、所定の距離程多数の部分に切断され、
それらの切断面が仕上げ加工されて陰極基体が仕上げら
れる工程、を含む含浸型陰極の陰極基体の製造方法。3. An impregnated cathode comprising a cathode structure and a cathode substrate having porous refractory pellets inserted in a cathode ring of refractory metal having open ends. Such heat-resistant metal cylinder is manufactured by pressing or dip drawing method, porous heat-resistant rod-shaped sintered body is manufactured through pressing process and high temperature sintering process, copper and plastic agent are porous. Of the heat-resistant sintered body to facilitate the cutting and processing of the rod-shaped sintered body, the step of impregnating the cavity of the porous sintered body with the electron-emitting substance, and The rod-shaped sintered body is inserted into the cylindrical structure while manufacturing the porous heat-resistant rod-shaped sintered body with only the heat-resistant sintered body, and these are connected to each other through laser line welding. And where It is cut into many parts at a fixed distance,
A process for producing a cathode substrate of an impregnated-type cathode, which comprises a step of finishing the cut surfaces to finish the cathode substrate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900015693A KR920007024A (en) | 1990-09-29 | 1990-09-29 | Impregnation type cathode manufacturing method |
| KR90-15693 | 1990-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04233127A JPH04233127A (en) | 1992-08-21 |
| JPH0610956B2 true JPH0610956B2 (en) | 1994-02-09 |
Family
ID=19304274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3251352A Expired - Fee Related JPH0610956B2 (en) | 1990-09-29 | 1991-09-30 | Method for manufacturing cathode substrate of impregnated cathode |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0610956B2 (en) |
| KR (1) | KR920007024A (en) |
-
1990
- 1990-09-29 KR KR1019900015693A patent/KR920007024A/en not_active Withdrawn
-
1991
- 1991-09-30 JP JP3251352A patent/JPH0610956B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04233127A (en) | 1992-08-21 |
| KR920007024A (en) | 1992-04-28 |
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|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19940719 |
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| LAPS | Cancellation because of no payment of annual fees |