JPH0663115B2 - Multi-stage electro-deposition coating equipment - Google Patents
Multi-stage electro-deposition coating equipmentInfo
- Publication number
- JPH0663115B2 JPH0663115B2 JP63170263A JP17026388A JPH0663115B2 JP H0663115 B2 JPH0663115 B2 JP H0663115B2 JP 63170263 A JP63170263 A JP 63170263A JP 17026388 A JP17026388 A JP 17026388A JP H0663115 B2 JPH0663115 B2 JP H0663115B2
- Authority
- JP
- Japan
- Prior art keywords
- electrodeposition
- electrodes
- coated
- electrode
- power supply
- 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 - Lifetime
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、特に湾曲面を有する導電性物体を通電により
電着塗装するのに適した装置に関する。Description: FIELD OF THE INVENTION The present invention relates to a device particularly suitable for electrocoating a conductive object having a curved surface by energization.
（従来技術） 例えば、自動車ボデイのような大きな物体の塗装は、被
塗装物を電着塗料液に浸漬させ電着電極との間に通電し
て塗料成分を付着させることにより行なわれているが、
電着開始時には、被塗装物の表面抵抗が小さいため、大
きな塗装電流が流れて急速な塗膜形成が行なわれて、塗
膜厚みのムラを起こしたり、塗膜密度が低くなって塗装
品質を低下させるという固有の問題がある。(Prior Art) For example, coating of a large object such as an automobile body is carried out by immersing an object to be coated in an electrodeposition coating liquid and energizing between the electrodeposition electrode and the electrodeposition electrode to deposit the coating component. ,
At the start of electrodeposition, since the surface resistance of the object to be coated is small, a large coating current flows and rapid coating film formation occurs, resulting in uneven coating film thickness and low coating density, resulting in poor coating quality. There is an inherent problem of lowering it.
このような問題を解消するため、第４図に示したよう
に、被塗装物Ｓの移動経路に沿って電着槽Ａ内に複数の
電着電極ｄ１〜ｄ９を配設するとともに、これを前半部
と、後半部に大きく２分割して、前半部の電極ｄ１〜ｄ
５には低電圧源ｃを、また後半部の電極ｄ６〜ｄ９には
高電圧源ｅを接続して、電着膜形成初期と、膜成長工程
とにおける電着電流の値を膜形成過程にあわせて変化さ
せる方式、いわゆる多段式電着塗装方法が採用されてい
る。In order to solve such a problem, as shown in FIG. 4, a plurality of electrodeposition electrodes d 1 to d 9 are arranged in the electrodeposition tank A along the movement path of the object S to be coated, and This is roughly divided into a first half and a second half, and the electrodes d 1 to d of the first half are divided.
5 is connected to the low voltage source c, and the electrodes d 6 to d 9 in the latter half are connected to the high voltage source e to determine the value of the electrodeposition current in the initial stage of the electrodeposition film formation and in the film growth step. A so-called multi-stage electro-deposition coating method is adopted, which changes according to the process.
この方式によれば、膜形成過程に合せて電着電流を自動
的に切換えることが可能となる反面、各工程に合せた電
極配置が必要となって、搬送経路の長大化や、電極数の
増大を招くと言う問題がある。According to this method, it is possible to automatically switch the electrodeposition current according to the film formation process, but on the other hand, it is necessary to arrange the electrodes according to each process, which lengthens the transfer path and reduces the number of electrodes. There is a problem that it causes an increase.
このような問題を解消するため、電極面に被塗装物の移
動方向に向いた絶縁板を配設し、浸漬口側に向く電気力
線の数を少なくさせ、もって浸漬初期における電流の集
中を避ける方法も提案されているが（特開昭55−97499
号公報）、電極板に多数の絶縁板を取り付ける必要があ
るため、電極構造が複雑になるという問題がある。In order to solve such a problem, an insulating plate facing the moving direction of the object to be coated is arranged on the electrode surface to reduce the number of electric lines of force facing the dipping port side, thus concentrating the current in the initial stage of dipping. A method of avoiding it has been proposed (Japanese Patent Laid-Open No. 55-97499).
However, since it is necessary to attach a large number of insulating plates to the electrode plate, there is a problem that the electrode structure becomes complicated.
（解決しようとする課題） 本発明は、このような問題に鑑みてなされたものであっ
て、その目的とするところは電極構造の複雑化を招くこ
となく、均一な電着膜を形成することができる新規な多
段式通電式電着塗装装置を提供することにある。(Problems to be Solved) The present invention has been made in view of the above problems, and an object thereof is to form a uniform electrodeposition film without causing complication of an electrode structure. It is to provide a novel multi-stage electrification type electro-deposition coating device capable of performing.
（課題を解決するための手段） このために、本発明においては、電着槽内に被塗装物の
移動経路に沿って複数の電着用電極を配設するととも
に、少なくとも前記複数の電着電極を移動方向について
２つのグループに分割し、前部側の電着電極には初期被
膜形成に適した電流を発生させる低電圧電源を、また後
部側の電着電極にはスイッチング手段を介して前記低電
圧電源と、被膜成長に適した電流を発生させる高電圧電
源を選択可能に接続して、同一の電着電極に初期被膜形
成用と被膜成長用の２つの機能をもたせ、以て装置の長
大化を招くことなく電着過程に合せた大きさの電流を供
給するようにした。(Means for Solving the Problems) To this end, in the present invention, a plurality of electrodeposition electrodes are arranged in the electrodeposition tank along the movement path of the object to be coated, and at least the plurality of electrodeposition electrodes are provided. Are divided into two groups in the moving direction, a low-voltage power source for generating a current suitable for forming an initial film is formed on the front electrodeposition electrode, and a switching device is connected to the rear electrodeposition electrode via a switching means. A low-voltage power source and a high-voltage power source that generates a current suitable for film growth are selectably connected so that the same electrodeposition electrode has two functions for initial film formation and film growth. An electric current of a magnitude suitable for the electrodeposition process was supplied without causing an increase in length.
（実施例） そこで、以下に本発明の詳細を図示した実施例に基づい
て詳細に説明する。(Embodiment) Therefore, the details of the present invention will be described below in detail based on an illustrated embodiment.
第１図は、本発明の一実施例を示すものであって、図中
符号1a,1b,1c,2a,2b,2c,2d,2eは、それぞれ電着槽３に
おいて被塗装物の移動方向に一列に配設された電着用電
極で、浸漬口側に配設された複数個1a〜1cのものはダイ
オー4a,4b,4cを介して低電流、つまり塗装初期に穏やか
に塗装膜を形成するのに適した値の電流を供給する低電
圧電源６に、また後半領域に配設された塗装電極4a〜4e
の内、侵入口側の４個のもの2a,2b,2c,2dには半導体ス
イッチ等のスイッチング素子５を介して前述の低電圧電
源６、及び初期被膜形成後に膜厚を増加させるのに適し
た電流を供給する高電圧電源８にスイッチング素子７を
介して接続され、さらに出口側の電極4eはダイオード９
を介し高電圧電源８に接続されている。FIG. 1 shows an embodiment of the present invention, in which reference numerals 1a, 1b, 1c, 2a, 2b, 2c, 2d and 2e indicate the moving directions of the object to be coated in the electrodeposition tank 3, respectively. The electrodes for electrodeposition arranged in a row on the immersion port side, and a plurality of electrodes 1a to 1c arranged on the dip side, have a low current through the diodes 4a, 4b, 4c, that is, a coating film is gently formed at the beginning of coating. To the low-voltage power supply 6 that supplies a current of a value suitable for
Among them, the four ones on the entrance side are suitable for increasing the film thickness after the low voltage power source 6 and the initial film formation through the switching element 5 such as a semiconductor switch for the 2a, 2b, 2c, 2d. Connected to a high-voltage power supply 8 for supplying a current through a switching element 7, and the electrode 4e on the outlet side is connected to a diode 9
Is connected to the high-voltage power supply 8 via.
この電着槽３の上方には、被塗装物の移動経路に沿うと
ともに、電着槽３の底面形状に倣うようにレール10が配
設され、これに絶縁物11を介して被塗装物Ｓを搬送する
導電性のハンガー12が設けられている。このレール10に
接近させて被塗装物の先端が第１電極群と第２電極群の
境界に位置したとき、及び被塗装物の後端が第１電極群
と第２電極群との境界に位置したときを検出する第１、
第２の位置検出器14、15が配設され、これからの信号は
後述する制御装置20に入力している。18は、給電用レー
ルで、ハンガー12が搬送レール10の斜面部10aを降りき
った時点で、ハンガー12に設けられている集電子19が導
電的に接触を開始し、この接触状態を平坦部10a、上り
斜面部10Cを移動中維持できるように配設され、低電圧
源６と高電圧源８の陰極側に接触されている。A rail 10 is arranged above the electrodeposition tank 3 so as to follow the movement path of the object to be coated and to follow the shape of the bottom surface of the electrodeposition tank 3, and the object to be coated S via an insulator 11 on the rail 10. A conductive hanger 12 is provided for carrying the. When the front end of the object to be coated is located at the boundary between the first electrode group and the second electrode group by approaching the rail 10, and the rear end of the object to be coated is at the boundary between the first electrode group and the second electrode group. First to detect when it is located,
The second position detectors 14 and 15 are provided, and signals from these are input to the control device 20 described later. Reference numeral 18 denotes a power supply rail, and when the hanger 12 has finished descending the slope 10a of the transport rail 10, a current collector 19 provided on the hanger 12 starts conductively contacting, and this contact state is flattened. 10a and the ascending slope portion 10C are arranged so as to be maintained during movement, and are in contact with the cathode sides of the low voltage source 6 and the high voltage source 8.
20は、前述の制御回路で、第１の位置検出器14から信号
が出力する迄は、第１のスイッチング素子５をOFF,第２
のスイッチング素子７をONにし、また第１の位置検出器
14から信号が出力した時点で、第１のスイッチング素子
５をOFFに、さらに第２の位置検出器15から信号が出力
された時点で第１のスイッチング素子５をOFFに、第２
のスイッチング素子７をONとするように構成されてい
る。なお、図中符号21は高圧側と低圧側を分離するため
の絶縁体を示す。Reference numeral 20 denotes the control circuit described above, which turns off the first switching element 5 and outputs the second switching element 5 until the signal is output from the first position detector 14.
The switching element 7 of is turned on, and the first position detector
When the signal is output from 14, the first switching element 5 is turned off, and when the signal is output from the second position detector 15, the first switching element 5 is turned off and the second switching element 5 is turned off.
The switching element 7 is turned on. Reference numeral 21 in the drawing indicates an insulator for separating the high voltage side and the low voltage side.
次に、このように構成した装置の動作を第２図に基づい
て説明する。Next, the operation of the apparatus thus configured will be described with reference to FIG.
いま、装置の電源を投入すると、制御回路20から信号が
出力して、第２のスイッチング素子７がONとなり、前半
領域の電極1a〜1cが低電圧源６に、また後半領域の電極
2a〜2d,および2eが高電圧源８に接続される。このよう
な状態においてハンガー12により被塗装物Ｓが搬送さ
れ、レール18の斜面部10aを降り，平坦部10bに移ると、
集電子19が給電レール12に接触して被塗装物Ｓと電極群
1a〜1c,2a〜2eとが電着用塗料液ｐを介して導電関係を
形成することになる。これにより、被塗装物Ｓには前半
領域の電極1a〜1cを介して低電圧源６から低電流、つま
り初期被膜形成に適した電流が供給される。同時に、い
まの状態においては、後半領域の電極2a〜2dと被塗装物
ｓとの間の距離Ｌが長いため、この電極群2a〜2eとの被
塗装物Ｓと間での電気抵抗が大きく、このため電極2a〜
2eからも実質的に低電流、つまり初期被膜形成に適した
値の電流が供給されることになる（第２図Ｉ）。これに
より、被塗装物Ｓは、全ての電極1a〜1c,2a〜2eから初
期被膜を形成するのに適した電流により電着を受け、被
塗装物Ｓと電極との方向差による影響を可及的に少なく
した状態で初期被膜が形成される結果、表面はもとより
裏面側にも均一に塗装膜が付着することになる。このよ
うな状態を維持しながら、ハンガー12は、レール10に沿
って移動する。被塗装物Ｓの先端が前半領域の電極1a,1
b,1cと、後半領域の電極2a,2b,2c,2d,2eとの境界まで移
動すると、ハンガー12が第１の位置検出器14を作動さ
せ、検出器14から信号を出力させる。これにより、制御
回路20は、信号を出力して第２のスイッチング素子７を
OFFに、また第１のスイッチング素子５をONにする。こ
れにより、後半領域の電極2a,2b,2c,2d,2eのうち被塗装
物Ｓに近い電極2a〜2dが低電圧源６に接続される（第２
図II）。被塗装物Ｓは、前半領域及び後半領域の電極1
a,1b,1c,2a,2b,2c,2d,2eから引続き低電流により電着作
用を受けることになる（III）。Now, when the power of the device is turned on, a signal is output from the control circuit 20, the second switching element 7 is turned on, and the electrodes 1a to 1c in the first half region serve as the low voltage source 6 and the electrodes in the second half region.
2a to 2d and 2e are connected to the high voltage source 8. In such a state, when the article S to be coated is transported by the hanger 12, goes down the slope portion 10a of the rail 18 and moves to the flat portion 10b,
The current collector 19 comes into contact with the power supply rail 12 and the object S to be coated and the electrode group
1a to 1c and 2a to 2e form a conductive relationship via the coating liquid p for electrodeposition. As a result, a low current, that is, a current suitable for initial film formation, is supplied to the object S to be coated from the low voltage source 6 via the electrodes 1a to 1c in the first half region. At the same time, in the present state, since the distance L between the electrodes 2a to 2d in the latter half area and the object to be coated s is long, the electric resistance between the electrode group 2a to 2e and the object to be coated S is large. , For this reason electrode 2a ~
2e also supplies a substantially low current, that is, a current having a value suitable for initial film formation (FIG. 2I). As a result, the object S to be coated is electrodeposited by a current suitable for forming the initial coating from all the electrodes 1a to 1c, 2a to 2e, and the influence of the direction difference between the object S to be coated and the electrodes is possible. As a result of the initial film being formed in a state where the amount is as small as possible, the coating film adheres not only to the front surface but also to the back surface side. The hanger 12 moves along the rail 10 while maintaining such a state. Electrodes 1a, 1 whose tip of the object to be coated S is in the first half area
When the hanger 12 moves to the boundary between the electrodes b, 1c and the electrodes 2a, 2b, 2c, 2d, 2e in the latter half area, the hanger 12 operates the first position detector 14 to output a signal from the detector 14. As a result, the control circuit 20 outputs a signal to turn on the second switching element 7.
It is turned off and the first switching element 5 is turned on. As a result, of the electrodes 2a, 2b, 2c, 2d, 2e in the latter half area, the electrodes 2a to 2d close to the object S to be coated are connected to the low voltage source 6 (second
(Figure II). The object to be coated S has electrodes 1 in the first half area and the second half area.
From a, 1b, 1c, 2a, 2b, 2c, 2d, 2e, they will continue to be electrodeposited by low current (III).
被塗装物Ｓと電極1a〜1c,2a〜2eとを結ぶ方向をかえた
状態で、被塗装物Ｓはさらに初期被膜形成を受けること
になって、特に自動車のボデーのように湾曲部を有する
ものであっても、表面はもとより、裏側のすみずみまで
もが均質で、緻密な初期被膜が形成されることになる。In a state where the direction connecting the object S to be coated and the electrodes 1a to 1c, 2a to 2e is changed, the object S to be coated is further subjected to initial film formation, and particularly has a curved portion like a car body. Even if it is a material, not only on the surface but also on the back side everywhere, it is uniform and a dense initial film is formed.
このようにして、被塗装物Ｓの後端が前半領域の電極1
a,1b,1cと後半領域の電極2a,2b,2c,2d,2eとの境界まで
移動して来ると、第２の位置検出器15から信号が出力
し、制御回路20は、第１スイッチング素子５をOFFに、
また第２スイッチング素子７をONとして、被塗装物Ｓが
近づいて来た後半領域の電極2a,2b,2c,2d,2eを高電圧源
８に接続する（IV）。被塗装物Ｓは、初期被膜の存在に
関わりなく引続いて電着作用を受け、前述の工程により
形成された初期被膜を成長させて電着膜の厚みを増加す
ることになる。このようにして、終端まで被塗装物Ｓが
移動した段階では、被塗装物の表面、及び裏面に所定の
膜厚の電着塗装が終了することになる。In this way, the rear end of the object S to be coated is the electrode 1 in the first half region.
When moving to the boundary between a, 1b, 1c and the electrodes 2a, 2b, 2c, 2d, 2e in the latter half area, a signal is output from the second position detector 15, and the control circuit 20 causes the first switching Turn off element 5,
Further, the second switching element 7 is turned on to connect the electrodes 2a, 2b, 2c, 2d, 2e in the latter half region where the object S to be coated approaches to the high voltage source 8 (IV). The object S to be coated is subsequently subjected to the electrodeposition action regardless of the existence of the initial coating film, and the initial coating film formed by the above-described process is grown to increase the thickness of the electrodeposition film. In this way, when the object S to be coated has moved to the end, the electrodeposition coating of a predetermined film thickness is completed on the front surface and the back surface of the object to be coated.
なお、この実施例においては、被塗装物の移動位置を検
出器により検出するようにしているが、浸漬開始時から
の時間により位置を割出すようにしてもよいことは明ら
かである。In addition, in this embodiment, the moving position of the object to be coated is detected by the detector, but it is obvious that the position may be indexed according to the time from the start of immersion.
また、この実施例においては、８個の電着電極を使用し
ているが、電着電極の個数は塗装物のサイズ等により設
計的に決定されるものである。In addition, although eight electrodeposited electrodes are used in this embodiment, the number of electrodeposited electrodes is designed by design size and the like.
また、この実施例においては、電着電極群を２つのグル
ープに分割しているが、３つ以上のグループに分割して
被塗装物の移動に合せて印加する電圧を調整するように
しても同様の作用を奏することは明らかである。Further, in this embodiment, the electrodeposition electrode group is divided into two groups, but it may be divided into three or more groups and the applied voltage may be adjusted according to the movement of the object to be coated. It is clear that the same effect is achieved.
（発明の効果） 以上、説明したように本発明においては、電着槽内に被
塗装物の移動経路に沿って複数の電着電極を配設すると
ともに、少なくとも前記複数の電着電極を移動方向につ
いて２つのグループに分割し、移動経路前部側の電着電
極には初期被膜形成に適した電流を供給する低電圧電源
を、また後部側の電着電極にはスイッチング手段を介し
て前記低電圧電源と、被膜成長に適した電流を供給する
高電圧電源を選択可能に接続したので、スイッチング素
子による電源の切替という簡単な操作により、被塗装物
の移動に応じて電着電極に供給する電着電流を調整し
て、特に塗装品質を左右する初期被膜形成時に電着電極
群を有効に利用して広い角度からの長時間にわたって電
着を実行することができ、自動車ボデーのような湾曲部
を有する物体の表裏面に均質な塗膜形成が可能となり、
電着塗装ラインの長大化や電極数の増大を招くことなく
品質の高い電着塗装を実現することが出来る。(Effects of the Invention) As described above, in the present invention, a plurality of electrodeposition electrodes are arranged in the electrodeposition tank along the movement path of the object to be coated, and at least the plurality of electrodeposition electrodes are moved. The direction is divided into two groups, a low voltage power source for supplying a current suitable for forming an initial film to the electrodeposition electrode on the front side of the moving path, and a switching means for the electrodeposition electrode on the rear side. A low-voltage power supply and a high-voltage power supply that supplies a current suitable for film growth are selectably connected, so a simple operation of switching the power supply by a switching element supplies power to the electrodeposition electrode according to the movement of the object to be coated. The electrodeposition current can be adjusted to effectively use the electrodeposition electrode group during the initial film formation that affects the coating quality, and electrodeposition can be performed for a long time from a wide angle. With curved part It is possible to form a uniform coating film on the front and back of
High-quality electrodeposition coating can be achieved without increasing the length of the electrodeposition coating line or increasing the number of electrodes.
第１図は、本発明の一実施例を示す装置の構成図、第２
図Ｉ〜IVは、それぞれ同上装置の動作を示す説明図、第
３図は、従来の多段式電着装置の一例を示す構成図であ
る。 1a〜1c,2a〜2e……電着用電極 ３……電着槽、６……低電圧電源 ５、７……スイッチング素子 ８……高電圧電源 10……搬送用レール、12……集電子 14、15……位置検出器 18……給電レール 20……制御回路、Ｓ……被塗装物 Ｐ……電着液FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention, and FIG.
FIGS. I to IV are explanatory views showing the operation of the above apparatus, and FIG. 3 is a configuration diagram showing an example of a conventional multi-stage electrodeposition apparatus. 1a to 1c, 2a to 2e ... electrodeposition electrode 3 ... electrodeposition tank, 6 ... low-voltage power supply 5, 7 ... switching element 8 ... high-voltage power supply 10 ... transportation rail, 12 ... current collector 14, 15 …… Position detector 18 …… Power supply rail 20 …… Control circuit, S …… Coating object P …… Electroplating liquid
Claims (1)
数の電着電極を配設するとともに、少なくとも前記複数
の電着電極を移動方向について２つのグループに分割
し、移動経路前部側の電着電極には初期被膜形成に適し
た電流を供給する低電圧電源を、また後部側の電着電極
にはスイッチング手段を介して前記低電圧電源と、被膜
成長に適した電流を供給する高電圧電源を選択可能に接
続して成る多段式通電電着塗装装置。1. A plurality of electrodeposition electrodes are arranged along a moving path of an object to be coated in an electrodeposition tank, and at least the plurality of electrodeposition electrodes are divided into two groups in a moving direction to form a moving path. A low-voltage power supply that supplies a current suitable for initial film formation to the front electrodeposition electrode, and a low-voltage power supply via a switching means to the rear electrodeposition electrode and a current suitable for film growth. A multi-stage electro-deposition coating equipment consisting of a selectable connection of a high voltage power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170263A JPH0663115B2 (en) | 1988-07-08 | 1988-07-08 | Multi-stage electro-deposition coating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170263A JPH0663115B2 (en) | 1988-07-08 | 1988-07-08 | Multi-stage electro-deposition coating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0222497A JPH0222497A (en) | 1990-01-25 |
| JPH0663115B2 true JPH0663115B2 (en) | 1994-08-17 |
Family
ID=15901695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63170263A Expired - Lifetime JPH0663115B2 (en) | 1988-07-08 | 1988-07-08 | Multi-stage electro-deposition coating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0663115B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8282802B2 (en) | 2007-08-29 | 2012-10-09 | Toyota Jidosha Kabushiki Kaisha | Work electrodeposition coating method and electrodeposition coating device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH059795A (en) * | 1991-07-04 | 1993-01-19 | Nissan Motor Co Ltd | Method and device for electrodeposition coating |
| DE202004014812U1 (en) * | 2004-09-21 | 2004-11-18 | Aeg Svs Power Supply Systems Gmbh | Arrangement for supplying variable loads |
| JP5950351B2 (en) * | 2012-12-21 | 2016-07-13 | トリニティ工業株式会社 | Electrodeposition coating equipment |
-
1988
- 1988-07-08 JP JP63170263A patent/JPH0663115B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8282802B2 (en) | 2007-08-29 | 2012-10-09 | Toyota Jidosha Kabushiki Kaisha | Work electrodeposition coating method and electrodeposition coating device |
| DE112008002189B4 (en) * | 2007-08-29 | 2013-10-10 | Toyota Jidosha Kabushiki Kaisha | Method and device for the electrolytic coating of a workpiece |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0222497A (en) | 1990-01-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |