JP2761589B2 - Heat exchanger - Google Patents
Heat exchangerInfo
- Publication number
- JP2761589B2 JP2761589B2 JP63334745A JP33474588A JP2761589B2 JP 2761589 B2 JP2761589 B2 JP 2761589B2 JP 63334745 A JP63334745 A JP 63334745A JP 33474588 A JP33474588 A JP 33474588A JP 2761589 B2 JP2761589 B2 JP 2761589B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- heat exchange
- exchange tube
- exchanger units
- 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
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
【発明の詳細な説明】 発明の属する技術分野 この発明は、例えば低温ショー・ケースや冷蔵庫の蒸
発器等として使用される熱交換器に関するものである。Description: TECHNICAL FIELD The present invention relates to a heat exchanger used as, for example, a low-temperature showcase or a refrigerator evaporator.
従来の技術 従来、低温ショー・ケースや冷蔵庫の蒸発器等として
使用される熱交換器は、例えば第８図に示すように、い
わゆるカチコミ方式により製造されていた。2. Description of the Related Art Conventionally, heat exchangers used as low-temperature showcases or evaporators for refrigerators have been manufactured by the so-called ticking method, as shown in FIG. 8, for example.
すなわち、熱交換管（21）が蛇行状に折り曲げられ、
この熱交換管（21）の直管部が、これと交差するように
配置された並列状プレートフィン（22）の上下両側縁部
の切欠き（23）に嵌め入れられ、最後にフィン（22）が
かしめられることにより、熱交換器（20）がつくられて
いた。That is, the heat exchange tube (21) is bent in a meandering shape,
The straight tube portion of the heat exchange tube (21) is fitted into the notches (23) at the upper and lower side edges of the parallel plate fins (22) arranged so as to intersect with the heat exchange tube (21). The heat exchanger (20) was made by caulking.
発明が解決しようとする課題 しかしながら、低温ショーケースや冷蔵庫に使用され
る熱交換器は、冷却性能や取付けスペースの関係で、２
つの熱交換器単体（20A）（20A）を連結して使用する場
合がある。Problems to be Solved by the Invention However, heat exchangers used for low-temperature showcases and refrigerators are not suitable for cooling performance and mounting space.
There are cases where two heat exchangers (20A) (20A) are connected and used.
このような場合、従来は、同図に示すように、２つの
熱交換器単体（20A）（20A）の熱交換管（21）（21）の
端部（21a）（21a）同士をアルゴン溶接等により接続し
ていたが、これでは２つの熱交換器単体（20A）（20A）
について最低１箇所の連結部が生じ、溶接工数が増加す
るため、熱交換器の製造が非常に面倒であり、従って生
産効率が低下し、ひいては製造コストが高くつくばかり
か、溶接部より冷媒か漏洩するおそれがあるという問題
があった。In such a case, the ends (21a) and (21a) of the heat exchange tubes (21) and (21) of the two heat exchangers (20A) and (20A) are conventionally argon-welded as shown in FIG. And so on, but in this case two heat exchangers alone (20A) (20A)
The production of the heat exchanger is very troublesome because at least one connecting portion is generated and the number of welding steps is increased, so that the production efficiency is reduced and the production cost is increased, and the refrigerant is more expensive than the welded portion. There was a problem that there was a risk of leakage.
この発明の目的は、上記の従来技術の問題を解決し、
複数個の熱交換器ユニットを１本の蛇行状熱交換管によ
り全く継目がなく連結することができ、従って従来の管
接続のための溶接工程を省略することができて、製造が
きわめて簡単で、製造の能率化により、生産効率を大幅
に増大し得、ひいては製造コストが安くつくうえに、フ
ィンと熱交換管との熱伝導性が良好で、熱交換性能がす
ぐれている熱交換器を提供しようとするにある。An object of the present invention is to solve the above-mentioned problems of the prior art,
A plurality of heat exchanger units can be connected seamlessly by a single meandering heat exchange tube, so that the conventional welding process for connecting tubes can be omitted, and the production is extremely simple. In addition, the production efficiency can be greatly increased by increasing the efficiency of production, and thus the production cost can be reduced. In addition, the heat exchanger with good heat conductivity between the fins and the heat exchange tubes and excellent heat exchange performance can be used. There is to try to offer.
課題を解決するための手段 この発明による熱交換器は、上記の目的を達成するた
めに、蛇行状の熱交換管と、これの直管部に対して交差
するように取り付けられた並列状プレートフィンとより
なる複数の熱交換器ユニットによって構成され、すべて
の熱交換器ユニットの熱交換管が全体としても蛇行状と
なされた１本の熱交換管よりなり、るとともに、熱交換
器ユニットの各プレートフィンの側縁部には複数のＵ形
の切欠きが所定間隔おきに設けられており、熱交換管の
直管部がこれらの切欠きにそれぞれ挿入されて、直管部
とフィンとが結合され、複数の熱交換器ユニットが、熱
交換管の１つの屈曲管部を介して相互に連結せしめられ
て上下に重なるように配置され、かつ上下に隣り合う熱
交換器ユニットの並列状プレートフィン同士が互いに対
向するものとなされていることを特徴としている。Means for Solving the Problems In order to achieve the above object, a heat exchanger according to the present invention has a meandering heat exchange tube and a parallel plate attached so as to intersect with a straight tube portion thereof. The heat exchanger units are composed of a plurality of fins, and the heat exchange tubes of all the heat exchanger units are formed of a single meandering heat exchange tube as a whole. A plurality of U-shaped notches are provided at predetermined intervals at the side edges of each plate fin, and the straight pipe portions of the heat exchange tubes are inserted into these notches, respectively, so that And a plurality of heat exchanger units are connected to each other via one bent tube portion of the heat exchange tube, are arranged so as to overlap one another, and are arranged in parallel with each other. Plate fins It is characterized by being opposed.
実 施 例 つぎに、この発明の実施例を図面を参照して説明す
る。Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.
なお、この明細書において、上下、左右および前後は
第１図を基準とし、上とは第１図上側、下とは同下側を
いゝ、また左とは同図左側、右とは同右側をいゝ、前と
は第１図図面紙葉の表側、後とは同裏側をいうものとす
る。In this specification, the upper, lower, left and right and front and rear are based on FIG. 1, upper is upper side of FIG. 1, lower is lower side of FIG. 1, left is left side of FIG. On the right side, the front means the front side of the sheet in FIG. 1 and the rear means the back side.
この発明の第１実施例を示す第１図〜第４図におい
て、この発明による熱交換器（10）は、蛇行状の熱交換
管（1A）と、これの直管部（1a）に対して交差するよう
に取り付けられた並列状プレートフィン（２）とよりな
る２つの熱交換器ユニット（10A）（10A）によって構成
され、すべての熱交換器ユニット（10A）の熱交換管（1
A）が全体としても蛇行状となされた１本の熱交換管
（１）よりなり、隣り合う熱交換器ユニット（10A）が
熱交換管（１）の１つの屈曲管部（1b）を介して連結せ
しめられ上下に重なるように配置され、かつ上下に隣り
合う熱交換器ユニット（10A）（10A）の並列状プレート
フィン（２）（２）同士が互いに対向するものとなされ
ているものである（第１図参照）。1 to 4 showing a first embodiment of the present invention, a heat exchanger (10) according to the present invention has a meandering heat exchange tube (1A) and a straight tube portion (1a) thereof. Heat exchanger units (10A) (10A) consisting of parallel plate fins (2) mounted so as to intersect with each other, and the heat exchange tubes (1) of all the heat exchanger units (10A)
A) is composed of one meandering heat exchange tube (1) as a whole, and adjacent heat exchanger units (10A) are connected via one bent tube portion (1b) of the heat exchange tube (1). The parallel plate fins (2) and (2) of the heat exchanger units (10A) and (10A) that are vertically adjacent to each other are arranged so as to be overlapped with each other. (See FIG. 1).
上記の熱交換器（10）の製造においては、第４図に示
すように、まず１本の熱交換管（１）が蛇行状に折り曲
げられ、ついで中央の１つの屈曲管部（1b）を中心とし
て、これの左半部（1A）と右半部（1A）とに並列状プレ
ートフィン（２）が、第３図に示すように、それぞれ取
り付けられる。In the manufacture of the heat exchanger (10), as shown in FIG. 4, one heat exchange tube (1) is first bent in a meandering shape, and then one bent tube portion (1b) at the center is bent. As a center, parallel plate fins (2) are attached to the left half (1A) and the right half (1A), respectively, as shown in FIG.
各プレートフィン（２）の上下両側縁部にはＵ形の切
欠き（３）が所定間隔おきに設けられており、熱交換管
（1A）の直管部（1a）がこれらの切欠き（３）にそれぞ
れ挿入されたのち、フィン（２）がかしめられて、直管
部（1a）とフィン（２）とが結合され、２つの熱交換器
ユニット（10A）（10A）が１つの屈曲管部（1b）で連結
された状態に形成される。U-shaped notches (3) are provided at predetermined intervals on both upper and lower edges of each plate fin (2), and the straight pipe portion (1a) of the heat exchange tube (1A) is provided with these notches (3). After being inserted into 3), the fins (2) are swaged, the straight pipe portion (1a) and the fins (2) are connected, and the two heat exchanger units (10A) and (10A) are bent into one. It is formed in a state of being connected by the pipe part (1b).
この状態において、第３図に矢印で示すように、右側
の熱交換器ユニット（10A）が屈曲管部（1b）を中心と
して上方に180゜ひねるように回転せしめられ、２つの
熱交換器ユニット（10A）（10A）が上下に重なるように
配置されて、第１図に示す熱交換器（10）が完成され
る。In this state, as shown by the arrow in FIG. 3, the right heat exchanger unit (10A) is rotated upward by 180 ° around the bent tube portion (1b), and the two heat exchanger units are turned. The heat exchanger (10) shown in FIG. 1 is completed by arranging (10A) and (10A) vertically.
なお、熱交換器（10）は、低温ショーケースや冷蔵庫
内の取付スペースの関係で、第３図に示すように、２つ
の熱交換器ユニット（10A）（10A）が左右に配置された
状態でも使用可能である。Note that the heat exchanger (10) has two heat exchanger units (10A) (10A) arranged on the left and right as shown in Fig. 3 due to the mounting space in the low-temperature showcase and refrigerator. But it can be used.
第５図と第６図は、この発明の第２実施例を示すもの
である。この第２実施例の熱交換器（10）は、３つの熱
交換器ユニット（10A）を具備している。この熱交換器
（10）は、１本の蛇行熱交換管（１）に並列状プレート
フィン（２）が、上記第１実施例の場合と同様に、隣り
合う熱交換器ユニット（10A）（10A）同士の間に１つの
屈曲管部（1b）を介在させるように取り付けられたの
ち、第６図に矢印で示すように、熱交換器ユニット（10
A）が屈曲管部（1b）を中心として上方に180゜ひねるよ
うに回転せしめられ、３つの熱交換器ユニット（10A）
が上下に重なるように配置せしめられることにより形成
されたものである。FIG. 5 and FIG. 6 show a second embodiment of the present invention. The heat exchanger (10) of the second embodiment includes three heat exchanger units (10A). In this heat exchanger (10), one meandering heat exchange tube (1) is provided with parallel plate fins (2), as in the case of the first embodiment, and adjacent heat exchanger units (10A) ( 10A) are mounted so that one bent pipe portion (1b) is interposed between them, and then, as shown by arrows in FIG.
A) is rotated 180 ° upward around the bent pipe part (1b), and three heat exchanger units (10A)
Are arranged so as to overlap one another up and down.
第７図は、この発明の第３実施例を示すものである。
ここで、上記第１実施例の場合と異なる点は、プレート
フイン（２）の片側の側縁部にのみ切欠き（３）が所定
間隔に設けられていて、各熱交換器ユニット（10A）に
蛇行状熱交換管（1A）が、いわば１重に取り付けられて
いる点にある。FIG. 7 shows a third embodiment of the present invention.
Here, the difference from the first embodiment is that notches (3) are provided at predetermined intervals only on one side edge of the plate fin (2), and each heat exchanger unit (10A) The point is that the meandering heat exchange tube (1A) is attached so to speak.
上記第２実施例と第３実施例のその他の点は、上記第
１実施例の場合と同様であるので、図面において同一の
ものには同一の符号を付した。The other points of the second embodiment and the third embodiment are the same as those of the first embodiment, and therefore, the same components are denoted by the same reference numerals in the drawings.
なお、熱交換器（10）の熱交換器ユニット（10A）の
個数、および配置方向は、図示のものに限定されず、低
温ショーケースおよび冷蔵庫等の冷却能力や取付スペー
スに応じて適宜設定されるものである。The number and the arrangement direction of the heat exchanger units (10A) of the heat exchanger (10) are not limited to those shown in the figure, but are appropriately set according to the cooling capacity and the mounting space of the low-temperature showcase and the refrigerator. Things.
発明の効果 この発明による熱交換器は、上述のように、蛇行状の
熱交換管と、これの直管部に対して交差するように取り
付けられた並列状プレートフィンとよりなる複数の熱交
換器ユニットによって構成され、すべての熱交換器ユニ
ットの熱交換管が全体としても蛇行状となされた１本の
熱交換管よりなるとともに、熱交換器ユニットの各プレ
ートフィンの側縁部には複数のＵ形の切欠きが所定間隔
おきに設けらており、熱交換管の直管部がこれらの切欠
きにそれぞれ挿入されて、直管部とフィンとが結合さ
れ、複数の熱交換器ユニットが、熱交換管の１つの屈曲
管部を介して相互に連結せしめられて上下に重なるよう
に配置され、かつ上下に隣り合う熱交換器ユニットの並
列状プレートフィン同士が互いに対向するものとなされ
ているもので、この発明によれば、複数個の熱交換器ユ
ニットを１本の蛇行状熱交換管により全く継目がなく連
結することができ、従って従来の管接続のための面倒な
溶接工程を省略することができて、製造がきわめて簡単
で、製造の能率化により、生産効率を大幅に増大し得、
ひいては製造コストが安くつく。Effect of the Invention As described above, the heat exchanger according to the present invention has a plurality of heat exchange tubes each including a meandering heat exchange tube and parallel plate fins mounted to intersect with the straight tube portion thereof. The heat exchange tubes of all the heat exchanger units are composed of a single meandering heat exchange tube as a whole. U-shaped notches are provided at predetermined intervals, and the straight pipe portions of the heat exchange tubes are inserted into these notches, respectively, and the straight pipe portions and the fins are joined to form a plurality of heat exchanger units. Are arranged so as to be connected to each other via one bent tube portion of the heat exchange tube so as to overlap vertically, and the parallel plate fins of the heat exchanger units vertically adjacent to each other are opposed to each other. What According to the present invention, a plurality of heat exchanger units can be seamlessly connected by a single meandering heat exchange tube, so that a troublesome welding process for connecting conventional pipes is omitted. And the production is extremely simple, and the production efficiency can be greatly increased by the production efficiency,
As a result, the manufacturing cost is low.
そのうえ、上下に隣り合う熱交換器ユニットの並列状
プレートフィン同士が互いに対向するものとなされてい
るとともに、熱交換器ユニットの各プレートフィンの側
縁部には複数のＵ形の切欠きが所定間隔おきに設けられ
て、熱交換管の直管部がこれらの切欠きにそれぞれ挿入
されて、直管部とフィンとが結合されているから、フィ
ンと熱交換管との熱伝導性が良好で、熱交換性能がすぐ
れており、例えば低温ショーケースや冷蔵庫の冷却性能
および取付スペースに充分適合する所望の大きさおよび
形状の熱交換器を、きわめて簡単にかつ生産効率よく安
価に製造することができるという効果を奏する。In addition, the parallel plate fins of the vertically adjacent heat exchanger units are opposed to each other, and a plurality of U-shaped notches are provided at the side edges of each plate fin of the heat exchanger unit. Provided at intervals, the straight pipe portion of the heat exchange tube is inserted into each of these notches, and the straight tube portion and the fin are joined, so that the heat conductivity between the fin and the heat exchange tube is good. To produce a heat exchanger of a desired size and shape that is well suited to the cooling performance and mounting space of a low-temperature showcase or a refrigerator, for example, and that is extremely simple, efficiently produced, and inexpensively. This has the effect that it can be performed.
第１図はこの発明の第１実施例を示す正面図、第２図は
同平面図、第３図は第１実施例の熱交換器の製造途中の
正面図、第４図は熱交換管のみの平面図、第５図はこの
発明の第２実施例を示す正面図、第６図は第２実施例の
熱交換器の製造途中の正面図、第７図はこの発明の第３
実施例を示す正面図である。第８図は従来例を示す正面
図である。 （１）（1A）……蛇行状熱交換管、（1a）……直管部、
（1b）……屈曲管部、（２）……プレートフィン、
（３）……切欠き、（10）……熱交換器、（10A）……
熱交換器ユニット。FIG. 1 is a front view showing a first embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the heat exchanger of the first embodiment in the course of manufacture, and FIG. FIG. 5 is a front view showing a second embodiment of the present invention, FIG. 6 is a front view of the heat exchanger of the second embodiment in the process of being manufactured, and FIG.
It is a front view showing an example. FIG. 8 is a front view showing a conventional example. (1) (1A) ... meandering heat exchange pipe, (1a) ... straight pipe section,
(1b) ... bending tube part, (2) ... plate fin,
(3) Notch, (10) Heat exchanger, (10A)
Heat exchanger unit.
Claims (1)
（1a）に対して交差するように取り付けられた並列状プ
レートフィン（２）とよりなる複数の熱交換器ユニット
（10A）によって構成され、すべての熱交換器ユニット
（10A）の熱交換管（1A）が全体としても蛇行状となさ
れた１本の熱交換管（１）よりなるとともに、熱交換器
ユニット（10A）の各プレートフィン（２）の側縁部に
は複数のＵ形の切欠き（３）が所定間隔おきに設けられ
ており、熱交換管（1A）の直管部（1a）がこれらの切欠
き（３）にそれぞれ挿入されて、直管部（1a）とフィン
（２）とが結合され、複数の熱交換器ユニット（10A）
が、熱交換管（１）の１つの屈曲管部（1b）を介して相
互に連結せしめられて上下に重なるように配置され、か
つ上下に隣り合う熱交換器ユニット（10A）（10A）の並
列状プレートフィン（２）（２）同士が互いに対向する
ものとなされていることを特徴とする、熱交換器。1. A plurality of heat exchanger units each comprising a meandering heat exchange tube (1A) and parallel plate fins (2) mounted so as to intersect the straight tube portion (1a). (10A), the heat exchange tubes (1A) of all the heat exchanger units (10A) are formed of one meandering heat exchange tube (1) as a whole, and the heat exchanger units (10A) A plurality of U-shaped notches (3) are provided at predetermined intervals at the side edge of each plate fin (2) of 10A), and the straight pipe portion (1a) of the heat exchange tube (1A) is Into the notch (3), the straight pipe part (1a) and the fin (2) are connected, and a plurality of heat exchanger units (10A)
Are connected to each other via one bent pipe portion (1b) of the heat exchange pipe (1), and are arranged so as to be vertically overlapped and vertically adjacent to each other. A heat exchanger characterized in that the parallel plate fins (2) (2) face each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334745A JP2761589B2 (en) | 1988-12-29 | 1988-12-29 | Heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334745A JP2761589B2 (en) | 1988-12-29 | 1988-12-29 | Heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02178596A JPH02178596A (en) | 1990-07-11 |
| JP2761589B2 true JP2761589B2 (en) | 1998-06-04 |
Family
ID=18280752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63334745A Expired - Fee Related JP2761589B2 (en) | 1988-12-29 | 1988-12-29 | Heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2761589B2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5747576Y2 (en) * | 1975-09-25 | 1982-10-19 | ||
| JPS57118269U (en) * | 1981-01-14 | 1982-07-22 | ||
| JPS60240987A (en) * | 1984-05-14 | 1985-11-29 | Showa Alum Corp | Heat exchanger with plate fin |
| JPH065649Y2 (en) * | 1985-09-04 | 1994-02-09 | 富士通株式会社 | Buffer handler mechanism of IC handler |
| JPS62156275U (en) * | 1986-03-18 | 1987-10-03 |
-
1988
- 1988-12-29 JP JP63334745A patent/JP2761589B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02178596A (en) | 1990-07-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |