DE69523702D1 - Verfahren zur modell-prädiktiven Regelung eines Lufttrennungssystemes - Google Patents
Verfahren zur modell-prädiktiven Regelung eines LufttrennungssystemesInfo
- Publication number
- DE69523702D1 DE69523702D1 DE69523702T DE69523702T DE69523702D1 DE 69523702 D1 DE69523702 D1 DE 69523702D1 DE 69523702 T DE69523702 T DE 69523702T DE 69523702 T DE69523702 T DE 69523702T DE 69523702 D1 DE69523702 D1 DE 69523702D1
- Authority
- DE
- Germany
- Prior art keywords
- model
- separation system
- air separation
- predictive control
- predictive
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04848—Control strategy, e.g. advanced process control or dynamic modeling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04642—Recovering noble gases from air
- F25J3/04648—Recovering noble gases from air argon
- F25J3/04654—Producing crude argon in a crude argon column
- F25J3/04666—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system
- F25J3/04672—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser
- F25J3/04678—Producing crude argon in a crude argon column as a parallel working rectification column of the low pressure column in a dual pressure main column system having a top condenser cooled by oxygen enriched liquid from high pressure column bottoms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
- F25J3/048—Argon recovery
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/048—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators using a predictor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/10—Mathematical formulae, modeling, plot or curves; Design methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S62/00—Refrigeration
- Y10S62/923—Inert gas
- Y10S62/924—Argon
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Software Systems (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Feedback Control In General (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/290,123 US5522224A (en) | 1994-08-15 | 1994-08-15 | Model predictive control method for an air-separation system |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69523702D1 true DE69523702D1 (de) | 2001-12-13 |
DE69523702T2 DE69523702T2 (de) | 2002-08-01 |
Family
ID=23114622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69523702T Expired - Fee Related DE69523702T2 (de) | 1994-08-15 | 1995-08-14 | Verfahren zur modell-prädiktiven Regelung eines Lufttrennungssystemes |
Country Status (10)
Country | Link |
---|---|
US (1) | US5522224A (de) |
EP (1) | EP0701186B1 (de) |
JP (1) | JP3251153B2 (de) |
KR (1) | KR100234232B1 (de) |
CN (1) | CN1079940C (de) |
BR (1) | BR9503639A (de) |
CA (1) | CA2156146C (de) |
DE (1) | DE69523702T2 (de) |
ES (1) | ES2162628T3 (de) |
MX (1) | MX9503502A (de) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4443190A1 (de) * | 1994-12-05 | 1996-06-13 | Linde Ag | Verfahren und Vorrichtung zur Tieftemperaturzerlegung von Luft |
GB9605171D0 (en) * | 1996-03-12 | 1996-05-15 | Boc Group Plc | Air separation |
DZ2671A1 (fr) * | 1997-12-12 | 2003-03-22 | Shell Int Research | Processus de liquéfaction d'un produit alimenté gazeux riche en méthane pour obtenir un gaz natural liquéfié. |
US6138474A (en) * | 1999-01-29 | 2000-10-31 | Air Products And Chemicals, Inc. | Argon production control through argon inventory manipulation |
DE19925259A1 (de) * | 1999-06-01 | 2000-12-07 | Linde Ag | Automatische Lastverstellung |
EP1160528A3 (de) * | 2000-05-30 | 2002-10-16 | L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude | Steuerungsvorrichtung und Verfahren für Luftzerlegungsanlagen |
DE10040391A1 (de) * | 2000-08-18 | 2002-02-28 | Linde Ag | Tieftemperaturluftzerlegungsanlage |
US6597958B1 (en) * | 2001-03-22 | 2003-07-22 | Abb Automation Inc. | Method for measuring the control performance provided by an industrial process control system |
US6622521B2 (en) * | 2001-04-30 | 2003-09-23 | Air Liquide America Corporation | Adaptive control for air separation unit |
JP4803897B2 (ja) * | 2001-05-14 | 2011-10-26 | 大陽日酸株式会社 | 空気液化分離装置の制御方法 |
KR100879867B1 (ko) * | 2002-09-02 | 2009-01-22 | 주식회사 포스코 | 알곤설비의 수소유량 제어방법 |
TWI314637B (en) | 2003-01-31 | 2009-09-11 | Shell Int Research | Process of liquefying a gaseous, methane-rich feed to obtain liquefied natural gas |
US7204101B2 (en) * | 2003-10-06 | 2007-04-17 | Air Liquide Large Industries U.S. Lp | Methods and systems for optimizing argon recovery in an air separation unit |
JP4866175B2 (ja) * | 2006-08-17 | 2012-02-01 | 出光興産株式会社 | 燃料ガス供給装置における燃料ガスの供給制御方法 |
CN101196498B (zh) * | 2006-12-06 | 2011-06-01 | 中国科学院计算技术研究所 | 一种质谱质量测量误差的预测方法 |
CN100440081C (zh) * | 2006-12-26 | 2008-12-03 | 浙江大学 | 空分塔的广义预测控制系统及方法 |
EP2307638B1 (de) | 2008-01-16 | 2015-03-25 | Cavas | Einrichtung zur zugangskontrolle von personen |
FR2951532A1 (fr) * | 2009-10-15 | 2011-04-22 | Air Liquide | Procede de regulation d'une colonne de separation d'argon dans un appareil de distillation cryogenique d'air et appareil de separation d'air comportant une colonne de separation d'argon ainsi regulee |
CN101763081B (zh) * | 2009-12-17 | 2011-11-23 | 浙江大学 | 一种空分节能过程的非线性过程观测系统及方法 |
FR2993363B1 (fr) * | 2012-07-13 | 2015-01-23 | Air Liquide | Procede et dispositif de detection d'un risque de dysfonctionnement dans une unite de separation des composants chimiques d'un produit, notamment de l'air |
EP3036591B1 (de) | 2013-08-22 | 2018-04-04 | L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Fehlererkennung beim bestimmen der konzentrationen von chemischen komponenten in einer destillationskolonne |
JP7086600B2 (ja) * | 2014-08-13 | 2022-06-20 | フィッシャー-ローズマウント システムズ,インコーポレイテッド | プロセス制御器、プロセス制御方法、プロセス制御デバイス、及び多重速度制御器 |
US9964354B2 (en) * | 2016-01-19 | 2018-05-08 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for producing pressurized gaseous oxygen through the cryogenic separation of air |
DE102016224207A1 (de) * | 2016-12-06 | 2018-06-07 | Siemens Aktiengesellschaft | Verfahren und Steuereinrichtung zum Steuern eines technischen Systems |
EP3473958B8 (de) * | 2017-10-18 | 2020-07-15 | Linde GmbH | Modellierung einer destillationskolonne bei betriebszustandsänderungen |
FR3082923B1 (fr) * | 2018-06-22 | 2020-10-16 | Air Liquide | Systeme de controle d'un debit d'argon en sortie d'une colonne de distillation |
FR3107341A1 (fr) * | 2020-02-18 | 2021-08-20 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Procédé et appareil de séparation d’air par distillation cryogénique |
CN113255207A (zh) * | 2021-04-14 | 2021-08-13 | 杭州电子科技大学 | 基于迭代多输出-马尔科夫链的空分系统氩馏分变量多步预测方法 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4349869A (en) * | 1979-10-01 | 1982-09-14 | Shell Oil Company | Dynamic matrix control method |
DE3342353A1 (de) * | 1983-11-23 | 1985-05-30 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zum betrieb eines computertomographen |
JPS62123279A (ja) * | 1985-11-22 | 1987-06-04 | 株式会社日立製作所 | 空気分離装置の制御方法 |
US4801209A (en) * | 1986-01-17 | 1989-01-31 | The Boc Group, Inc. | Process and apparatus for analyzing a gaseous mixture and a visible emission spectrum generator therefor |
US4784677A (en) * | 1987-07-16 | 1988-11-15 | The Boc Group, Inc. | Process and apparatus for controlling argon column feedstreams |
US4836836A (en) * | 1987-12-14 | 1989-06-06 | Air Products And Chemicals, Inc. | Separating argon/oxygen mixtures using a structured packing |
US5150317A (en) * | 1989-01-11 | 1992-09-22 | The Boeing Company | Adaptive digital filter which is responsive to the rate of change of an input signal |
DE3913880A1 (de) * | 1989-04-27 | 1990-10-31 | Linde Ag | Verfahren und vorrichtung zur tieftemperaturzerlegung von luft |
US5100447A (en) * | 1990-08-30 | 1992-03-31 | The Boc Group, Inc. | Argon recovery from partial oxidation based ammonia plant purge gases |
US5257206A (en) * | 1991-04-08 | 1993-10-26 | Praxair Technology, Inc. | Statistical process control for air separation process |
US5313800A (en) * | 1993-02-01 | 1994-05-24 | Praxair Technology, Inc. | Process for maximizing the recovery of argon from an air separation system at high argon recovery rates |
-
1994
- 1994-08-15 US US08/290,123 patent/US5522224A/en not_active Expired - Lifetime
-
1995
- 1995-08-14 CN CN95116365A patent/CN1079940C/zh not_active Expired - Fee Related
- 1995-08-14 MX MX9503502A patent/MX9503502A/es unknown
- 1995-08-14 DE DE69523702T patent/DE69523702T2/de not_active Expired - Fee Related
- 1995-08-14 JP JP22699795A patent/JP3251153B2/ja not_active Expired - Fee Related
- 1995-08-14 KR KR1019950025271A patent/KR100234232B1/ko not_active IP Right Cessation
- 1995-08-14 EP EP95112775A patent/EP0701186B1/de not_active Revoked
- 1995-08-14 ES ES95112775T patent/ES2162628T3/es not_active Expired - Lifetime
- 1995-08-14 BR BR9503639A patent/BR9503639A/pt not_active Application Discontinuation
- 1995-08-15 CA CA002156146A patent/CA2156146C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
BR9503639A (pt) | 1996-04-16 |
CN1079940C (zh) | 2002-02-27 |
CA2156146A1 (en) | 1996-02-16 |
EP0701186B1 (de) | 2001-11-07 |
JP3251153B2 (ja) | 2002-01-28 |
EP0701186A2 (de) | 1996-03-13 |
US5522224A (en) | 1996-06-04 |
KR100234232B1 (ko) | 1999-12-15 |
DE69523702T2 (de) | 2002-08-01 |
ES2162628T3 (es) | 2002-01-01 |
MX9503502A (es) | 1997-06-28 |
CN1126307A (zh) | 1996-07-10 |
EP0701186A3 (de) | 1996-07-03 |
JPH0869302A (ja) | 1996-03-12 |
CA2156146C (en) | 1998-08-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8363 | Opposition against the patent | ||
8339 | Ceased/non-payment of the annual fee |