JP2500724Y2 - Cryogenic refrigerator - Google Patents
Cryogenic refrigeratorInfo
- Publication number
- JP2500724Y2 JP2500724Y2 JP40020390U JP40020390U JP2500724Y2 JP 2500724 Y2 JP2500724 Y2 JP 2500724Y2 JP 40020390 U JP40020390 U JP 40020390U JP 40020390 U JP40020390 U JP 40020390U JP 2500724 Y2 JP2500724 Y2 JP 2500724Y2
- Authority
- JP
- Japan
- Prior art keywords
- refrigerator
- stage cold
- pulse tube
- reciprocating
- 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 - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本考案は、極低温（例えば温度１
００Ｋ以下）機器の冷却等に使用される冷凍機に関す
る。BACKGROUND OF THE INVENTION The present invention is applicable to extremely low temperatures (for example, temperature 1
00K or less) The present invention relates to a refrigerator used for cooling equipment.
【０００２】[0002]
【従来の技術】図２は、本出願人が実用新案登録出願し
た実願昭６２−１５６０８８号（実開平２−６０１５８
号）に係るスターリングサイクル，ギフォード・マクマ
ホンサイクル，ソルベイサイクル等のピストンまたはデ
イスプレーサを用いた往復動式冷凍機とパルス管冷凍機
から構成される極低温冷凍機の系統図である。2. Description of the Related Art FIG. 2 shows a utility model registration application filed by the applicant of the present application, which is Japanese Utility Model Application No. 62-156088 (Actual Utility Model No.
Is a system diagram of a cryogenic refrigerator including a reciprocating refrigerator and a pulse tube refrigerator using a piston or a displacer such as a Stirling cycle, a Gifford-McMahon cycle, a Solvay cycle, etc.
【０００３】図２において、１は往復動式冷凍機，２は
パルス管冷凍機，３は往復動式冷凍機１に高圧ヘリウム
ガスを供給するガス圧縮機，４は往復動式冷凍機１とガ
ス圧縮機３に接続された高圧ガス配管，５は往復動式冷
凍機１で断熱膨張したヘリウムガスがガス圧縮機３に戻
る低圧ガス配管，６は往復動式冷凍機１に接続され同往
復動式冷凍機１が寒冷を発生する第一段寒冷発生部，７
は第一段寒冷発生部６に熱的に接続された第二段寒冷発
生部である。第一段寒冷発生部６は最低到達温度として
約４０Ｋ程度、第二段寒冷発生部７は最低到達温度とし
て約１０Ｋ程度である。In FIG. 2, 1 is a reciprocating refrigerator, 2 is a pulse tube refrigerator, 3 is a gas compressor for supplying high-pressure helium gas to the reciprocating refrigerator 1, and 4 is a reciprocating refrigerator 1. The high-pressure gas pipe connected to the gas compressor 3, 5 is a low-pressure gas pipe in which the helium gas adiabatically expanded in the reciprocating refrigerator 1 returns to the gas compressor 3, 6 is connected to the reciprocating refrigerator 1, and reciprocates the same. The first-stage cold generation part where the dynamic refrigerator 1 generates cold, 7
Is a second-stage cold generation unit thermally connected to the first-stage cold generation unit 6. The first stage cold generation part 6 has a minimum ultimate temperature of about 40K, and the second stage cold generation part 7 has a minimum ultimate temperature of about 10K.
【０００４】３１はパルス管冷凍機２に高圧ヘリウムガ
スを供給するガス圧縮機，３２，３３はそれぞれパルス
管冷凍機２とガス圧縮機３１を接続する高圧ガス配管と
低圧ガス配管，３４は高圧ガスを冷凍部に供給したり低
圧ガスを冷凍部から排気してガス圧縮機３１に戻すため
の切り替えを行なうロータリバルブであり、前記高圧ガ
ス配管３２と低圧ガス配管に接続されている。３５は前
記ロータリバルブ３４に接続され、高圧ヘリウムガスを
冷凍部に送ったり、低圧ヘリウムガスを冷凍部から戻す
ためのガス配管である。Reference numeral 31 is a gas compressor for supplying high pressure helium gas to the pulse tube refrigerator 2, 32 and 33 are high pressure gas pipes and low pressure gas pipes for connecting the pulse tube refrigerator 2 and the gas compressor 31, respectively, and 34 is high pressure. It is a rotary valve that performs switching for supplying gas to the refrigeration unit or exhausting low pressure gas from the refrigeration unit and returning it to the gas compressor 31, and is connected to the high pressure gas pipe 32 and the low pressure gas pipe. Reference numeral 35 is a gas pipe connected to the rotary valve 34 for sending high-pressure helium gas to the freezing section and returning low-pressure helium gas from the freezing section.
【０００５】このパルス管冷凍機２において、高圧ガス
と低圧ガスの往復は、ロータリバルブ３４で周期的に１
００回／分程度で行なわれる。３６はその一端が前記ガ
ス配管３５に接続された蓄冷器で蓄冷材として銅の金網
（１００メッシュ〜４００メッシュ程度）または直径１
mm以下の鉛球等が充填されている。３７は蓄冷器３６の
他端に接続されたガス配管である。３８は前記ガス配管
３７に接続された寒冷発生部で被冷却物を取り付けて冷
却する。３９は寒冷発生部３８に取付けられたセラミッ
クス等多孔質の焼結金属部であって、ヘリウムガスの整
流作用と排出される低温・低圧のヘリウムガスの寒冷を
充分回収するための熱交換作用を行なう。４０はステン
レス鋼等熱伝導の良くない材料で作られたパルス管で、
焼結金属部３９に連設されており、この管の内部で高圧
ヘリウムガスが上部へ移動し、次に低圧となった時ヘリ
ウムガスは下部へ移動する。このように、ヘリウムガス
は、パルス管４０内で間欠的な上下の往復運動を繰り返
す。４１はパルス管４の焼結金属部２９と反対側の端部
に取付けられた放熱部で、銅等熱伝導の良い材料で作ら
れており、第二段寒冷発生部７と熱的に接続されてお
り、放熱部４１を冷却する構造となっている。In this pulse tube refrigerator 2, the rotary valve 34 periodically reciprocates the high pressure gas and the low pressure gas back and forth.
It is performed about 00 times / minute. 36 is a regenerator whose one end is connected to the gas pipe 35, and as a regenerator material is a copper wire mesh (about 100 mesh to 400 mesh) or a diameter of 1
It is filled with lead balls of mm or less. Reference numeral 37 is a gas pipe connected to the other end of the regenerator 36. Numeral 38 is a cold generation part connected to the gas pipe 37 to attach and cool an object to be cooled. Reference numeral 39 denotes a porous sintered metal part such as ceramics attached to the cold generation part 38, which has a rectifying function of the helium gas and a heat exchanging function for sufficiently recovering the cold of the discharged low temperature and low pressure helium gas. To do. 40 is a pulse tube made of a material with poor heat conduction such as stainless steel,
It is connected to the sintered metal portion 39, and the high-pressure helium gas moves to the upper part inside this tube, and when the pressure becomes next low, the helium gas moves to the lower part. In this way, the helium gas repeats intermittent up-and-down reciprocating motion within the pulse tube 40. Reference numeral 41 denotes a heat radiating portion attached to the end of the pulse tube 4 opposite to the sintered metal portion 29, which is made of a material having good thermal conductivity such as copper and is thermally connected to the second stage cold generating portion 7. The heat dissipation part 41 is cooled.
【０００６】２０は常温部から低温部への輻射熱の侵入
を防止するための熱シールド板で、同熱シールド板２０
は箱状に形成され、その内部に第一段と第二段の寒冷発
生部６，７，ガス配管３７，寒冷発生部３８，焼結金属
部３９，パルス管４０，及び放熱部４１が収容されてお
り、第一段寒冷発生部６と熱的に接続されて冷却され、
侵入する輻射熱の熱負荷を第一段寒冷発生部６で吸収す
る。また、高温部が常温（３００Ｋ程度）、低温部が極
低温（１０Ｋ以下）になる蓄冷器３６は熱シールド板２
０内に挿入されており、常温部からの熱伝導による侵入
熱の大部分を熱シールド板２０を介して、第一段寒冷発
生部６で吸収する構造となっている。２１は真空断熱の
ための熱シールド板２０等を取囲む真空容器、２２は断
熱のため真空容器２１及び熱シールド板２０内に形成さ
れた真空部である。Reference numeral 20 is a heat shield plate for preventing radiant heat from entering from a room temperature part to a low temperature part.
Is formed in a box shape, and the cold generating parts 6 and 7 of the first and second stages, the gas pipe 37, the cold generating part 38, the sintered metal part 39, the pulse tube 40, and the heat radiating part 41 are housed therein. And is thermally connected to the first-stage cold generation unit 6 to be cooled,
The heat load of the radiant heat that enters is absorbed by the first-stage cold generation unit 6. In addition, the regenerator 36 in which the high temperature part has room temperature (about 300K) and the low temperature part has extremely low temperature (10K or less) is the heat shield plate 2
It has a structure in which most of the invasion heat due to heat conduction from the room temperature part is absorbed by the first stage cold generation part 6 via the heat shield plate 20. Reference numeral 21 is a vacuum container surrounding the heat shield plate 20 for vacuum heat insulation, and 22 is a vacuum portion formed in the vacuum container 21 and the heat shield plate 20 for heat insulation.
【０００７】以上のパルス管冷凍機２において、ガス圧
縮機３１で高圧となったヘリウムガスは高圧ガス配管３
２，ロータリバルブ３４，ガス配管３５および蓄冷器３
６を通って温度１０Ｋ前後に冷却された後、ガス配管３
７，焼結金属部３９を通ってパルス管４０に入る。パル
ス管内部のガス圧縮機は放熱部４１を介して第二段寒冷
発生部７で吸収される。次にロータリバルブ３４が低圧
側に切り替わると、パルス管４０内部のガスは断熱膨張
して寒冷発生部３８の温度は１０Ｋ以下に低下して寒冷
を発生する。低圧となったヘリウムガスはガス配管３７
を通り、蓄冷器３６で寒冷を回収されて常温となる。常
温となった低圧ヘリウムガスはガス配管３５，ロータリ
バルブ３４，低圧ガス配管３３を通ってガス圧縮機３１
へ戻る。In the pulse tube refrigerator 2 described above, the high pressure helium gas in the gas compressor 31 causes the high pressure gas pipe 3
2, rotary valve 34, gas pipe 35 and regenerator 3
After being cooled to around 10K through 6
7. Enter the pulse tube 40 through the sintered metal portion 39. The gas compressor inside the pulse tube is absorbed in the second stage cold generation part 7 via the heat dissipation part 41. Next, when the rotary valve 34 is switched to the low pressure side, the gas inside the pulse tube 40 is adiabatically expanded and the temperature of the cold generation part 38 is lowered to 10 K or less to generate cold. The low pressure helium gas is gas pipe 37
The cold is recovered by the regenerator 36 to reach normal temperature. The low-pressure helium gas at room temperature passes through the gas pipe 35, the rotary valve 34, and the low-pressure gas pipe 33, and then the gas compressor 31.
Return to.
【０００８】以上の冷凍サイクルを１分間に約１００回
程度行なうことにより、間欠的に温度１０Ｋ以下の寒冷
を発生することができる。By performing the above refrigeration cycle about 100 times per minute, it is possible to intermittently generate a cold temperature of 10 K or less.
【０００９】[0009]
【考案が解決しようとする課題】図２に示す前記の冷凍
機において、往復運動式冷凍機１は第一段寒冷発生部
６，第二段寒冷発生部７に寒冷を発生するためピストン
またはデイスプレーサが１分間に１２０回程度往復動し
ており、従って機械的振動が第一段寒冷発生部６，第二
段寒冷発生部７に発生している。In the refrigerating machine shown in FIG. 2, the reciprocating type refrigerating machine 1 generates a cold in the first stage cold generating part 6 and the second stage cold generating part 7 so as to generate a piston or a day. The sprayer reciprocates about 120 times per minute, and thus mechanical vibration is generated in the first stage cold generation part 6 and the second stage cold generation part 7.
【００１０】その結果、第一段寒冷発生部６の振動が熱
シールド板２０を介して蓄冷器３６へ、第二段寒冷発生
部７の振動は放熱部４１へ伝わるため、パルス管冷凍機
２に振動が発生し、また、寒冷発生部３８に取り付けら
れた被冷却物に振動が発生する等の問題点があった。As a result, the vibration of the first stage cold generating part 6 is transmitted to the regenerator 36 via the heat shield plate 20 and the vibration of the second stage cold generating part 7 is transmitted to the heat radiating part 41, so that the pulse tube refrigerator 2 However, there is a problem in that the object to be cooled attached to the cold generating portion 38 also vibrates.
【００１１】本考案は、以上の問題点を解決することが
できる極低温冷凍機を提供しようとするものである。The present invention is intended to provide a cryogenic refrigerator capable of solving the above problems.
【００１２】[0012]
【課題を解決するための手段】本考案は、スターリング
サイクル，ギフォード・マクマホンサイクル，ソルベイ
サイクル等のピストン又はデイスプレーサを用いた往復
動式冷凍機とパルス管冷凍機を備え、前記往復動式冷凍
機の第一段寒冷発生部が熱シールド板に熱的に接続され
ると共に同第一段寒冷発生部が熱シールド板内方に設け
られた第二段寒冷発生部に熱的に接続され、前記パルス
管冷凍機の放熱部が前記第二段寒冷発生部に熱的に接続
された極低温冷凍機において、前記往復動式冷凍機の第
一段寒冷発生部と前記熱シールド板を伸縮継手を介して
接続し、前記往復動式冷凍機の第二段寒冷発生部と前記
パルス管冷凍機の放熱部を低沸点の熱伝導率の大きいガ
スを封入した伸縮継手を介して接続した。The present invention is provided with a reciprocating refrigerator and a pulse tube refrigerator using a piston or a displacer such as a Stirling cycle, a Gifford-McMahon cycle, a Solvay cycle, and the reciprocating type. The first-stage cold generator of the refrigerator is thermally connected to the heat shield plate, and the first-stage cold generator is thermally connected to the second-stage cold generator provided inside the heat shield plate. In a cryogenic refrigerator in which the heat radiation part of the pulse tube refrigerator is thermally connected to the second stage cold generation part, the first stage cold generation part of the reciprocating refrigerator and the heat shield plate are expanded and contracted. The reciprocating refrigerator was connected to the second stage cold generator and the heat dissipation portion of the pulse tube refrigerator via an expansion joint enclosing a gas having a low boiling point and a high thermal conductivity.
【００１３】[0013]
【作用】本考案の極低温冷凍機は、往復動式冷凍機の第
一段寒冷発生部と第二段寒冷発生部、及び前記第二段寒
冷発生部とパルス管冷凍機の放熱部とが、それぞれ伸縮
継手で接続されているために、往復動式冷凍機にて発生
する機械的振動がパルス管冷凍機側に伝達されるのが低
減される。また、第二段寒冷発生部とパルス管冷凍機の
放熱部を接続する伸縮継手内に沸点が低く、かつ、熱伝
導率の大きいガスを封入しているので、熱的接続も損わ
れることがない。In the cryogenic refrigerator of the present invention, the reciprocating refrigerator has a first-stage cold generating part and a second-stage cold generating part, and a second-stage cold generating part and a heat dissipation part of the pulse tube refrigerator. Since the expansion joints are connected to each other, the mechanical vibration generated in the reciprocating refrigerator is reduced from being transmitted to the pulse tube refrigerator. Also, since the expansion joint that connects the second-stage cold generator and the heat radiator of the pulse tube refrigerator contains a gas with a low boiling point and high thermal conductivity, the thermal connection may be impaired. Absent.
【００１４】[0014]
【実施例】本考案の一実施例を、図１によって説明す
る。本実施例は、図２に示す極低温冷凍機を以下説明す
るように改良したものであって、図１において、図２に
示される従来の極低温冷凍機におけると同一の部分は同
一の符号を付し、その説明を省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. This embodiment is an improvement of the cryogenic refrigerator shown in FIG. 2 as described below. In FIG. 1, the same parts as those in the conventional cryogenic refrigerator shown in FIG. Is attached and the description thereof is omitted.
【００１５】ピストン又はデイスプレーサを用いた往復
動式冷凍機１の第一段寒冷発生部６は、ベローズ８を介
して熱シールド板２０と熱的に接続されて、熱シールド
板２０を冷却する構造となっている。また、前記往復動
式冷凍機１の第二段寒冷発生部７はベローズ９を介して
パルス管冷凍機２の放熱部４１と熱的に接続されて、放
熱部４１を冷却する構造となっており、同ベローズ９に
は沸点が低く、かつ、熱伝導率が大きいヘリウムガス１
０が封入されている。The first stage cold generator 6 of the reciprocating refrigerator 1 using a piston or a displacer is thermally connected to the heat shield plate 20 via the bellows 8 to cool the heat shield plate 20. It has a structure that Further, the second stage cold generation part 7 of the reciprocating refrigerator 1 is thermally connected to the heat radiation part 41 of the pulse tube refrigerator 2 via the bellows 9 to cool the heat radiation part 41. And the bellows 9 has a low boiling point and a large thermal conductivity.
0 is enclosed.
【００１６】以上のように構成された本実施例では、往
復動式冷凍機１の第一段寒冷発生部６と熱シールド板２
０とがベローズ８を介して接続され、また、往復動式冷
凍機１の第二段寒冷発生部７とパルス管冷凍機２の放熱
部４１はベローズ９を介して接続されているために、往
復動式冷凍機１の振動がパルス管冷凍機側の蓄冷器３
６，放熱部４１等へ伝達されることが低減される。これ
によって、パルス管冷凍機２及びその寒冷発生部３８に
取付けられた被冷却物へ往復動式冷凍機１の振動が発生
することを防ぐことができる。In the present embodiment configured as described above, the first stage cold generator 6 and the heat shield plate 2 of the reciprocating refrigerator 1.
0 is connected via the bellows 8, and the second stage cold generation part 7 of the reciprocating refrigerator 1 and the heat dissipation part 41 of the pulse tube refrigerator 2 are connected via the bellows 9, The vibration of the reciprocating refrigerator 1 is due to the regenerator 3 on the pulse tube refrigerator side.
6, transmission to the heat dissipation part 41 etc. is reduced. As a result, it is possible to prevent vibration of the reciprocating refrigerator 1 from occurring in the object to be cooled attached to the pulse tube refrigerator 2 and the cold generator 38 thereof.
【００１７】また、前記の第二段寒冷発生部７と放熱部
４１を接続するベローズ９には、沸点が低く極低温でも
ガス状を保持し、かつ熱伝導率が大きいヘリウムガス１
０が封入されているために、第二段寒冷発生部７と放熱
部４１との間の熱的接続が良好となり、パルス管冷凍機
２の冷凍能力が損われることがない。Further, the bellows 9 connecting the second stage cold generation part 7 and the heat dissipation part 41 has a helium gas 1 which has a low boiling point, maintains a gaseous state even at an extremely low temperature, and has a large thermal conductivity.
Since 0 is enclosed, the thermal connection between the second-stage cold generation part 7 and the heat dissipation part 41 becomes good, and the refrigerating capacity of the pulse tube refrigerator 2 is not impaired.
【００１８】[0018]
【考案の効果】以上説明したように、本考案では、往復
動式冷凍機とパルス管冷凍機及び往復動式冷凍機と熱シ
ールド板の間に熱的接続が行なわれる部分に伸縮継手を
配置しているために、往復動式冷凍機にて発生している
機械的振動がパルス管冷凍機側へ伝達されるのを低減す
ることができる。従って、パルス管冷凍機の寒冷発生部
に取り付けられる被冷却物の振動を低減することができ
る。As described above, according to the present invention, the expansion joint is arranged in the portion where the thermal connection is made between the reciprocating refrigerator and the pulse tube refrigerator, and the reciprocating refrigerator and the heat shield plate. Therefore, it is possible to reduce the transmission of mechanical vibration generated in the reciprocating refrigerator to the pulse tube refrigerator side. Therefore, it is possible to reduce the vibration of the object to be cooled attached to the cold generation part of the pulse tube refrigerator.
【００１９】また、往復動式冷凍機の第二段寒冷発生部
とパルス管冷凍機の放熱部の間に配置された伸縮継手に
沸点が低く熱伝導率の大きなガスを封入しているので、
パルス管冷凍機の冷凍能力も損われることを防止するこ
とができる。Further, since a gas having a low boiling point and a high thermal conductivity is sealed in the expansion joint arranged between the second stage cold generator of the reciprocating refrigerator and the heat radiating portion of the pulse tube refrigerator,
It is possible to prevent the refrigerating capacity of the pulse tube refrigerator from being impaired.
【００２０】即ち、本考案によって、被冷却物の振動が
少なく、かつ、従来の冷凍機と同等の冷凍能力を保有す
る極低温冷凍機を提供することができる。That is, according to the present invention, it is possible to provide a cryogenic refrigerator having less vibration of the object to be cooled and having the same refrigerating capacity as the conventional refrigerator.
【図１】本考案の一実施例の系統図である。FIG. 1 is a system diagram of an embodiment of the present invention.
【図２】従来の極低温冷凍機の系統図である。FIG. 2 is a system diagram of a conventional cryogenic refrigerator.
１ 往復動式冷凍機 ２ パルス管冷凍機 ６ 第一段寒冷発生部 ７ 第二段寒冷発生部 ８，９ ベローズ １０ ヘリウムガス ２０ 熱シールド板 ３６ 蓄冷器 ３８ 寒冷発生部 ４０ パルス管 ４１ 放熱部 1 Reciprocating refrigerator 2 Pulse tube refrigerator 6 First stage cold generating part 7 Second stage cold generating part 8,9 Bellows 10 Helium gas 20 Heat shield plate 36 Regenerator 38 Cold generating part 40 Pulse tube 41 Radiating part
Claims (1)
復動式冷凍機とパルス管冷凍機を備え、前記往復動式冷
凍機の第一段寒冷発生部が熱シールド板に熱的に接続さ
れると共に同第一段寒冷発生部が熱シールド板内の第二
段寒冷発生部に熱的に接続され、前記パルス管冷凍機の
放熱部が前記第二段寒冷発生部に熱的に接続された極低
温冷凍機において、前記往復動式冷凍機の第一段寒冷発
生部と前記熱シールド板を伸縮継手を介して接続し、前
記往復動式冷凍機の第二段寒冷発生部と前記パルス管冷
凍機の放熱部を低沸点の熱伝導率の大きいガスを封入し
た伸縮継手を介して接続したことを特徴とする極低温冷
凍機。1. A reciprocating refrigerator using a piston or a displacer and a pulse tube refrigerator are provided, and a first stage cold generator of the reciprocating refrigerator is thermally connected to a heat shield plate. Along with the first-stage cold generating part is thermally connected to the second-stage cold generating part in the heat shield plate, the heat dissipation part of the pulse tube refrigerator is thermally connected to the second-stage cold generating part. In a cryogenic refrigerator, the first stage cold generator of the reciprocating refrigerator and the heat shield plate are connected via an expansion joint, and the second stage cold generator of the reciprocating refrigerator and the pulse tube. A cryogenic refrigerator characterized in that the heat radiating portion of the refrigerator is connected via an expansion joint enclosing a gas having a low boiling point and a large thermal conductivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40020390U JP2500724Y2 (en) | 1990-12-07 | 1990-12-07 | Cryogenic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40020390U JP2500724Y2 (en) | 1990-12-07 | 1990-12-07 | Cryogenic refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0490861U JPH0490861U (en) | 1992-08-07 |
| JP2500724Y2 true JP2500724Y2 (en) | 1996-06-12 |
Family
ID=31878483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40020390U Expired - Lifetime JP2500724Y2 (en) | 1990-12-07 | 1990-12-07 | Cryogenic refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2500724Y2 (en) |
-
1990
- 1990-12-07 JP JP40020390U patent/JP2500724Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0490861U (en) | 1992-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960130 |