JPS62228867A - Horizontal type heat treating furnace for manufacturing carbon fiber - Google Patents
Horizontal type heat treating furnace for manufacturing carbon fiberInfo
- Publication number
- JPS62228867A JPS62228867A JP7335486A JP7335486A JPS62228867A JP S62228867 A JPS62228867 A JP S62228867A JP 7335486 A JP7335486 A JP 7335486A JP 7335486 A JP7335486 A JP 7335486A JP S62228867 A JPS62228867 A JP S62228867A
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- treatment chamber
- yarn
- hot air
- furnace
- 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
- 229920000049 Carbon (fiber) Polymers 0.000 title claims description 12
- 239000004917 carbon fiber Substances 0.000 title claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title description 8
- 238000004519 manufacturing process Methods 0.000 title description 3
- 238000010438 heat treatment Methods 0.000 claims description 48
- 238000005192 partition Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高性能炭素繊維を高速生産性下に製造するのに
適した熱処理炉、とくに耐炎化熱処押枦ｖｒａ［ｉナム
本のである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a heat treatment furnace suitable for producing high-performance carbon fibers at high speed productivity, especially a flame-retardant heat treatment press. .
炭素繊維、とくにアクリロニトリル系合成繊維を原料と
して作られた炭素繊維は、七の引張強度が５００ ｋｌ
？／ｍ”以上、伸度２％以上と極めて高性能なものとす
ることができるため、航空、宇宙用素材としての用途開
発が進められている。Carbon fiber, especially carbon fiber made from acrylonitrile synthetic fiber, has a tensile strength of 500 kl.
? Since it can be made into extremely high-performance materials with elongation of 2% or more and an elongation of 2% or more, it is being developed for use as a material for aviation and space.
アクリロニトリル系合成繊維を出発原料として炭素繊維
を製造するには、まず該繊維を２００〜３５０℃の酸化
性雰囲気下で耐炎化処理することが必要であるが、この
耐炎化反応工程は発熱反応であるため、−挙に大量の糸
条を耐炎化ユ、すう□、ｉやイ、あ。、ゆ、８゜ユ９．
１死に現象が認められるに至るため、これまでは、でき
るだけ糸間隔を設けた小規模焼成法により作らざるを得
す、その製造コストの低減は極めて困難なものとなって
おり、従来より、この困難を解決するための方法が提案
されてきた。To produce carbon fiber using acrylonitrile synthetic fiber as a starting material, it is first necessary to flame-retardate the fiber in an oxidizing atmosphere at 200 to 350°C, but this flame-retardant reaction process is an exothermic reaction. Because of this, a large amount of yarn has to be made flame resistant. , Yu, 8° Yu9.
Until now, this method had to be manufactured using a small-scale firing method with as much yarn spacing as possible, making it extremely difficult to reduce manufacturing costs. Methods have been proposed to solve the difficulties.
例えば特公昭５２−２１０９０号公報に示される方法、
或いは特開昭５５−１３２２号公報及び特開昭５５−７
１８１８号公報に示される方法があり、後者には熱処理
炉内に複数本上下に並べられた広巾ローラ群の間に、ア
クリロニトリル系繊維束をかけ渡し、これらローラ群を
定速で熱処理炉入口より出口に向けて移動せしめながら
熱風を炉の天井部より吹出し床部で吸気する、いわゆる
ホットフルー型熱処理炉を用いた竪型耐炎化処理炉が示
されている。For example, the method shown in Japanese Patent Publication No. 52-21090,
Or JP-A-55-1322 and JP-A-55-7
There is a method shown in Publication No. 1818, in which the acrylonitrile fiber bundle is passed between a plurality of wide roller groups arranged vertically in a heat treatment furnace, and these roller groups are moved at a constant speed from the entrance of the heat treatment furnace. A vertical flame retardant treatment furnace is shown that uses a so-called hot flue type heat treatment furnace in which hot air is blown out from the ceiling of the furnace and taken in at the floor while being moved toward the outlet.
これらの方法によると、連続して大量のアクリロニトリ
ル系繊維束を耐炎化処理することが可能であるが、これ
ら竪型炉の最大の難点は、炉内で極部的な上昇気流が生
じ、均一な温度分布を有する熱処理炉とすることができ
ない点にあり、この方法によって得た部分的に不均一熱
処理を受けた耐炎化糸は、その炭素化処理法を工夫して
も引張強度５００ ｋｇ／ｍｍ”以上の高強度炭素繊維
或いは弾性率２７〜３３ ｔ／＊が、引張強度５００
ｋｇ７ｎｙｉ２以上の高強度中外性炭素繊維を効率よ（
作ることは極めて難しい現状にある。According to these methods, it is possible to continuously flame-retardate a large amount of acrylonitrile fiber bundles, but the biggest drawback of these vertical furnaces is that local updrafts occur within the furnace, making it difficult to maintain uniformity. However, the flame-retardant yarn obtained by this method and partially subjected to non-uniform heat treatment has a tensile strength of 500 kg/kg even if the carbonization treatment method is devised. High-strength carbon fiber with a tensile strength of 500 mm or more or an elastic modulus of 27 to 33 t/*
Efficiently use high-strength medium- and external-strength carbon fibers of kg7nyi2 or more (
The current situation is that it is extremely difficult to create one.
一方、特公昭５２−２１６０４号公報に示される如き横
型熱処理炉は、熱風の風向きを上下方向或いは左右方向
に変更して熱処理を行ってもやはり炉内での対流現象を
極めて小さくすることはできず、均一な熱処理を行うこ
とはできない。更に、この横型炉ではシート状に並列し
た多数本のアクリロニトリル系合成繊維を焼成しようと
する際には熱風の供給方法が極めて難しいという難点を
も有している。On the other hand, in the horizontal heat treatment furnace as shown in Japanese Patent Publication No. 52-21604, even if heat treatment is performed by changing the direction of the hot air to the vertical or horizontal direction, the convection phenomenon within the furnace cannot be minimized. Therefore, uniform heat treatment cannot be performed. Furthermore, this horizontal furnace has the disadvantage that it is extremely difficult to supply hot air when attempting to sinter a large number of acrylonitrile synthetic fibers arranged in a sheet-like manner.
そこで本発明者らは、熱風吹き出し口と吸気口を糸条の
通路の上下に備えた構造とするとともに、この熱処理室
の前後に糸条通過口がスリット状構造のシール室を設け
ることによって、従来法に比べ、極めて均一な温度制御
性を備えた熱処理炉となし得ることを見出し本発明を完
成した。Therefore, the present inventors created a structure in which a hot air outlet and an intake port were provided above and below the yarn passage, and provided seal chambers with yarn passage ports having a slit-like structure before and after this heat treatment chamber. The present invention was completed by discovering that a heat treatment furnace with extremely uniform temperature control compared to conventional methods can be achieved.
即ち本発明の要旨とするところは、熱処理室内に糸条の
移送方向と平行な方向へ熱風を吹き出す熱風吹き出し口
（１１と該熱風を熱処理室外に排出する為の吸気口（２
）とを糸条の通路の上下に備え、かつ、糸条の通路間を
区画するよう・に熱処理室内に仕切板（３）を設けた熱
処理室と、熱処理室の出入口部にスリット（６）を有す
るシール室（４，５）を設け、該シール室内の糸条の通
路を区画するようにシール室内に仕切板（７，８）を設
けたことを特徴とする炭素繊維製造用の横型熱処理炉に
ある。That is, the gist of the present invention is to provide a hot air outlet (11) for blowing hot air into the heat treatment chamber in a direction parallel to the yarn transfer direction and an air inlet (2) for discharging the hot air to the outside of the heat treatment chamber.
) above and below the yarn passage, and a heat treatment chamber with a partition plate (3) provided in the heat treatment chamber to partition the yarn passage, and a slit (6) at the entrance and exit of the heat treatment chamber. horizontal heat treatment for carbon fiber production, characterized in that a seal chamber (4, 5) having a It's in the furnace.
以下図面により本発明を具体的に説明する。The present invention will be specifically explained below with reference to the drawings.
第１図は糸条（Ａｌの移送方向と平行な方向へ熱風を吹
き出す熱風吹き出し口（１ｍ）、（ｉｂ）、 （ｌｃ）
・・・と、該熱風を熱処理室外に排出する為の吸気口（
２ａ）、 （２ｂ）、 ｃ２ｅ）・・・ とを糸条の通
路の上下に備え、かつ、糸条の通路を区画するように熱
処理室内に仕切板（３ａ）、 （３ｂ）・・・を設ける
とともに、熱処理室の出入口にスリットを有するシール
室（４）及び（５）を設け、該シール室内の糸条の通路
を区画するように仕切板（７ｍ）、 （７ｂ）・・・及
び（８ｍ）、 （８ｂ）・・・を設けた本発明の炭素繊
維製造用の横型熱処理炉を示す。Figure 1 shows a hot air outlet (1 m), (ib), (lc) that blows hot air in a direction parallel to the direction of transfer of yarn (Al).
...and an intake port for discharging the hot air outside the heat treatment chamber (
2a), (2b), c2e)... are provided above and below the thread passage, and partition plates (3a), (3b)... are provided in the heat treatment chamber to partition the thread passage. At the same time, sealing chambers (4) and (5) having slits are provided at the entrance and exit of the heat treatment chamber, and partition plates (7m), (7b)... and ( 8m), (8b)... The horizontal heat treatment furnace for producing carbon fiber of the present invention is shown.
第２図に示すように熱風吹鎗出し口（ｌａ）。As shown in Figure 2, the hot air blowgun outlet (la).
（ｔｂ）、 （１ｃ）・・・ より熱処理室に供給され
る熱風は、通常、熱処理室外に設けた熱風加熱器（１３
）とファン（１４）を、吸気口（２ａ）ｔ （２ｂ）ｔ
（２ｃ） ”・と熱風吹き出し口（１ａ）、（ｌｂ）
＊ （ｌｃ）・・・ とダクトにより接続して循環使用
される。シール室（４）及び（５）の前後には糸条が通
過できるようにスリット（６ａ）ｔ ｃ６ｂ）、 （ｓ
ｃ）・・・が設けられている。(tb), (1c)... The hot air supplied to the heat treatment chamber is usually heated by a hot air heater (13) installed outside the heat treatment chamber.
) and the fan (14), the intake port (2a)t (2b)t
(2c) ”・Hot air outlet (1a), (lb)
* Connected to (lc)... by a duct and used for circulation. Before and after the seal chambers (4) and (5), slits (6a), (s) are provided so that the yarn can pass through.
c)... is provided.
このスリットの開口寸法は糸条と接触しない範囲で可能
な限り狭い方が好ましく、この点から上下方向に調節可
能なスリットとするのが好ましい。The opening size of this slit is preferably as narrow as possible without coming into contact with the yarn, and from this point it is preferable that the slit be adjustable in the vertical direction.
さらに、仕切板（７ａ）、 （７ｂ） ・・・及び（８
ａ） 。Furthermore, partition plates (7a), (7b) ... and (8
a).
（８ｂ）・・・により形成される小室１’、 ｌｌ’
、 ｌ’・・・及びド、 ｎ’、 ８１８８
には夫々排気口（９ａ）、 （９ｂ）。(8b) Small chambers 1', ll' formed by...
, l'...and do, n', 8188
have exhaust ports (9a) and (9b), respectively.
（９ｃ） ”・及び（ｔｏａ）、 （１ｏｂ）、 （１
０ｃ） ・−が設けられており、炉外に設置したファン
（１１）及び（１２）により個別に排気出来る構造とな
っている。(9c) ”・(toa), (1ob), (1
0c) ・- are provided, and the structure allows for individual exhaustion using fans (11) and (12) installed outside the furnace.
熱風吹き出し口（１ｍ）＋ （ｌｂ）ｐ （ｌｃ） ・
・・ 及び吸気口（２ａ）？ （２ｂ）Ｉ （２ｃ）
・・・ を本発明の構造とすることにより、炉内におけ
る熱風の流れを容易に糸条走行方向と実質的に平行な流
れとすることができ、シート状に並列した多数の糸条を
耐炎化処理しても激しい糸条間摩擦を防げるため、この
工程における擦過による糸条の毛羽立ちや糸切れ現象が
ほとんど起こらないものとすることができる。また、熱
処理室内に仕切板を設けることにより仕切板で区画され
る熱処理室内の空間１． Ｉｆ、 Ｉ・・・ の雰
囲気の熱対流を従来開発されてきた炉に比べ著しく低い
ものとすることができるので、偏流のないより均一な流
れとなし得るだけでなく、炉内の上下方向の温度の不均
一性をも低減できる。Hot air outlet (1m) + (lb) p (lc) ・
... and the intake port (2a)? (2b)I (2c)
By adopting the structure of the present invention, the flow of hot air in the furnace can be easily made substantially parallel to the thread running direction, and a large number of threads arranged in parallel in the form of a sheet can be flame-resistant. Since severe friction between the yarns can be prevented even through the chemical treatment, it is possible to substantially prevent yarn fluffing or yarn breakage due to friction in this process. In addition, by providing a partition plate in the heat treatment chamber, the space inside the heat treatment chamber divided by the partition plate 1. Since the thermal convection in the atmosphere of If, I... can be made significantly lower than in conventionally developed furnaces, it is possible to not only achieve a more uniform flow without drifting, but also to improve the vertical flow inside the furnace. Temperature non-uniformity can also be reduced.
一般に、熱処理室内の圧力と炉外の圧力との圧力差は、
気体温度の違いにより生ず゛る熱処理室内外の浮力差の
影響で炉の高さ方向に変化する。そのため、熱処理室の
上部スリットからは熱風が炉外に逃げやすく、又、下部
スリットからは外部気体が熱処理室内へ流入し易いが、
本発明の熱処理炉は前述した如きシール室（４１及び（
５）を備えているため、シール室内の圧力を熱処理室内
の圧力より小さくすることができるので熱処理室内の圧
力変動に伴う熱処理室内への外部気体の流入による熱処
理室の温度変化を極めて少なくすることができるのであ
る。Generally, the pressure difference between the pressure inside the heat treatment chamber and the pressure outside the furnace is
It changes in the height direction of the furnace due to the difference in buoyancy between the inside and outside of the heat treatment chamber, which is caused by the difference in gas temperature. Therefore, hot air tends to escape from the furnace through the upper slit of the heat treatment chamber, and external gas tends to flow into the heat treatment chamber through the lower slit.
The heat treatment furnace of the present invention has seal chambers (41 and () as described above).
5), the pressure inside the sealing chamber can be made lower than the pressure inside the heat treatment chamber, thereby minimizing temperature changes in the heat treatment chamber due to the inflow of external gas into the heat treatment chamber due to pressure fluctuations within the heat treatment chamber. This is possible.
さらに、シール室にも仕切板を設けであるので各シール
小室に夫々独立した排気機構あるいは圧力調整機構を備
えることにより各スリット位置における熱処理室内とシ
ール室内の圧力差を個別に制御できるので前述の熱処理
室内外の浮力差の影響による熱処理室への外気の流入及
び熱風の過度の流出を抑制することができ、従来にない
温度の均一性に優れた熱処理炉とすることに成功したの
である。Furthermore, since the sealing chamber is also provided with a partition plate, each sealing chamber is equipped with an independent exhaust mechanism or pressure adjustment mechanism, so that the pressure difference between the heat treatment chamber and the sealing chamber at each slit position can be individually controlled. It was possible to suppress the inflow of outside air into the heat treatment chamber and the excessive outflow of hot air due to the difference in buoyancy between the outside and outside of the heat treatment chamber, and succeeded in creating a heat treatment furnace with unprecedented temperature uniformity.
本発明の熱処理炉は前述したごとき構造を有するため、
熱処理室を所定の温度に加熱した際の温度コントロール
性に極めて優れていると共に、風向きが糸条の走行方向
と平行に保たれているため走行糸条に無理な力が加えら
れることを防止することができ、シート状に編成した糸
条を熱処理した際にも糸条間の異常な摩擦による毛羽や
糸切れの発生を防ぎ得るものであり、特に炭素繊維製造
工程におい１採用する耐炎化炉として用いた場合、その
性能を高く発揮することができるものである。Since the heat treatment furnace of the present invention has the structure described above,
It has excellent temperature control when heating the heat treatment chamber to a predetermined temperature, and the wind direction is kept parallel to the running direction of the yarn, which prevents excessive force from being applied to the running yarn. It can prevent the occurrence of fuzz and yarn breakage due to abnormal friction between yarns even when yarn knitted into a sheet is heat-treated.In particular, flame-resistant furnaces are used in the carbon fiber manufacturing process. When used as such, it can exhibit its performance at a high level.
第１図は本発明による炭素繊維製造用の横型熱処理炉の
概略構造を示す豆断面図、第２図は第１図を上から見た
平面断面図である。
ｌａ、 ｌｂ、 ｌｃ・・・熱風吹き出し口２＆、 ２
ｂ、 ２ｅ・・・吸気口
３ａ、３ｂ・・・仕切板
４．５ ・・・シール室
６ｍ、 ６ｂ、 ６ｃ・・・スリット
Ｔ＆、’Ｉｂ・・・仕切板
８ａ、８ｂ・・・仕切板
９ａ、 ９ｂ、 ９ｃｍ−−排気口
１０ａ、 １０ｂ、 １０ｃ １°排気口１１．１２・
・・排気ファン
１３・・・熱風加熱器
１４・・・ファン
Ａ・・・糸条FIG. 1 is a cross-sectional view showing a schematic structure of a horizontal heat treatment furnace for producing carbon fibers according to the present invention, and FIG. 2 is a plan cross-sectional view of FIG. 1 viewed from above. LA, LB, LC...Hot air outlet 2 &, 2
b, 2e...Intake ports 3a, 3b...Partition plate 4.5...Seal chamber 6m, 6b, 6c...Slit T&,'Ib...Partition plate 8a, 8b...Partition plate 9a, 9b, 9cm--exhaust port 10a, 10b, 10c 1° exhaust port 11.12・
...Exhaust fan 13...Hot air heater 14...Fan A...Yarn
Claims (1)
出す熱風吹き出し口（１）と該熱風を熱処理室外に排出
する為の吸気口（２）とを糸条の通路の上下に備え、か
つ、糸条の通路間を区画するように熱処理室内に仕切板
（３）を設けた熱処理室と、熱処理室の出入口部にスリ
ット（６）を有するシール室（４）、（５）を設け、該
シール室内の糸条の通路を区画するようにシール室内に
仕切板（７）、（８）を設けたことを特徴とする炭素繊
維製造用の横型熱処理炉。A hot air outlet (1) for blowing hot air into the heat treatment chamber in a direction parallel to the direction in which the yarn is transferred, and an intake port (2) for discharging the hot air outside the heat treatment chamber are provided above and below the yarn passage, and , a heat treatment chamber provided with a partition plate (3) in the heat treatment chamber so as to partition the passages of the yarn, and seal chambers (4) and (5) each having a slit (6) at the entrance/exit portion of the heat treatment chamber; A horizontal heat treatment furnace for producing carbon fibers, characterized in that partition plates (7) and (8) are provided in the sealing chamber so as to partition the passage of yarn within the sealing chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7335486A JPS62228867A (en) | 1986-03-31 | 1986-03-31 | Horizontal type heat treating furnace for manufacturing carbon fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7335486A JPS62228867A (en) | 1986-03-31 | 1986-03-31 | Horizontal type heat treating furnace for manufacturing carbon fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62228867A true JPS62228867A (en) | 1987-10-07 |
| JPH034834B2 JPH034834B2 (en) | 1991-01-24 |
Family
ID=13515742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7335486A Granted JPS62228867A (en) | 1986-03-31 | 1986-03-31 | Horizontal type heat treating furnace for manufacturing carbon fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62228867A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06173123A (en) * | 1992-09-14 | 1994-06-21 | Nippon Steel Corp | Method for sealing infusibilizing furnace for pitch-based carbon fiber and apparatus therefor |
| JPH06173124A (en) * | 1992-09-14 | 1994-06-21 | Nippon Steel Corp | Method for regulating atmosphere between infusibilizing furnace and carbonizing furnace and apparatus therefor |
| WO2002077337A1 (en) * | 2001-03-26 | 2002-10-03 | Toho Tenax Co., Ltd. | Flame resistant rendering heat treating device, and operation method for the device |
| JP2015168897A (en) * | 2014-03-06 | 2015-09-28 | 三菱レイヨン株式会社 | Method for manufacturing carbon fiber |
-
1986
- 1986-03-31 JP JP7335486A patent/JPS62228867A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06173123A (en) * | 1992-09-14 | 1994-06-21 | Nippon Steel Corp | Method for sealing infusibilizing furnace for pitch-based carbon fiber and apparatus therefor |
| JPH06173124A (en) * | 1992-09-14 | 1994-06-21 | Nippon Steel Corp | Method for regulating atmosphere between infusibilizing furnace and carbonizing furnace and apparatus therefor |
| WO2002077337A1 (en) * | 2001-03-26 | 2002-10-03 | Toho Tenax Co., Ltd. | Flame resistant rendering heat treating device, and operation method for the device |
| US7335018B2 (en) | 2001-03-26 | 2008-02-26 | Toho Tenax Co., Ltd. | Flame resistant rendering heat treating device, and operation method for the device |
| JP2015168897A (en) * | 2014-03-06 | 2015-09-28 | 三菱レイヨン株式会社 | Method for manufacturing carbon fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH034834B2 (en) | 1991-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |