PT615951E - Processo para purificacao e concentracao de acido sulfurico - Google Patents
Processo para purificacao e concentracao de acido sulfurico Download PDFInfo
- Publication number
- PT615951E PT615951E PT94103524T PT94103524T PT615951E PT 615951 E PT615951 E PT 615951E PT 94103524 T PT94103524 T PT 94103524T PT 94103524 T PT94103524 T PT 94103524T PT 615951 E PT615951 E PT 615951E
- Authority
- PT
- Portugal
- Prior art keywords
- sulfuric acid
- concentration
- extraction column
- acid
- purification
- Prior art date
Links
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims description 157
- 238000000034 method Methods 0.000 title claims description 35
- 238000000746 purification Methods 0.000 title claims description 22
- 239000002253 acid Substances 0.000 claims description 37
- 238000000605 extraction Methods 0.000 claims description 30
- 238000006396 nitration reaction Methods 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 16
- 239000000356 contaminant Substances 0.000 claims description 14
- 239000006227 byproduct Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 150000001491 aromatic compounds Chemical class 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- QUPVPSAQYXGFCJ-UHFFFAOYSA-N [N].S(O)(O)(=O)=O Chemical compound [N].S(O)(O)(=O)=O QUPVPSAQYXGFCJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 13
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 229910017604 nitric acid Inorganic materials 0.000 description 9
- 239000012071 phase Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010908 decantation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- -1 steam Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WDCYWAQPCXBPJA-UHFFFAOYSA-N 1,3-dinitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC([N+]([O-])=O)=C1 WDCYWAQPCXBPJA-UHFFFAOYSA-N 0.000 description 1
- DYSXLQBUUOPLBB-UHFFFAOYSA-N 2,3-dinitrotoluene Chemical compound CC1=CC=CC([N+]([O-])=O)=C1[N+]([O-])=O DYSXLQBUUOPLBB-UHFFFAOYSA-N 0.000 description 1
- ZPTVNYMJQHSSEA-UHFFFAOYSA-N 4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1 ZPTVNYMJQHSSEA-UHFFFAOYSA-N 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical class [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 150000001896 cresols Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 1
- 238000006053 organic reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000004976 peroxydisulfates Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/88—Concentration of sulfuric acid
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- C01B17/905—Removal of organic impurities
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- C01B17/94—Recovery from nitration acids
-
- 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
- Y10S159/00—Concentrating evaporators
- Y10S159/08—Multieffect or multistage
-
- 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
- Y10S159/00—Concentrating evaporators
- Y10S159/42—Seals
-
- 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
- Y10S203/00—Distillation: processes, separatory
- Y10S203/08—Waste heat
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Degasification And Air Bubble Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/033,653 US5275701A (en) | 1993-03-15 | 1993-03-15 | Process for purification and concentration of sulfuric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PT615951E true PT615951E (pt) | 2000-12-29 |
Family
ID=21871661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PT94103524T PT615951E (pt) | 1993-03-15 | 1994-03-08 | Processo para purificacao e concentracao de acido sulfurico |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5275701A (Direct) |
| EP (1) | EP0615951B1 (Direct) |
| KR (1) | KR960012707B1 (Direct) |
| CN (1) | CN1036575C (Direct) |
| DE (1) | DE69425170T2 (Direct) |
| PT (1) | PT615951E (Direct) |
| TW (1) | TW282410B (Direct) |
Families Citing this family (47)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE503793C2 (sv) * | 1995-02-01 | 1996-09-09 | Kvaerner Pulping Tech | Förfarande vid behandling av kondensat |
| EP0775491A4 (en) * | 1995-06-22 | 1998-05-20 | Tayca Corp | IMMUNOSTIMULANT |
| US5603839A (en) * | 1995-09-18 | 1997-02-18 | Cecebe Technologies Inc. | Process for the recovery of waste sulphuric acid |
| DE19600810A1 (de) * | 1996-01-11 | 1997-07-17 | Wacker Chemie Gmbh | Verfahren zum Reinigen von Schwefelsäure |
| CA2254612A1 (en) * | 1996-09-06 | 2000-05-27 | Bayer Aktiengesellschaft | A process for purifying and concentrating spent sulphuric acids |
| DE19636191B4 (de) * | 1996-08-02 | 2008-04-03 | Bayer Materialscience Ag | Verfahren zur Reinigung und Aufkonzentrierung von gebrauchten Schwefelsäuren |
| DE19642328A1 (de) * | 1996-10-14 | 1998-04-16 | Bayer Ag | Verfahren zur Aufkonzentrierung von gebrauchten Schwefelsäuren |
| JP3507317B2 (ja) | 1996-12-20 | 2004-03-15 | 富士通株式会社 | 蒸留装置及び蒸留方法 |
| EP0970016A2 (en) * | 1997-03-31 | 2000-01-12 | Waterworks International, Inc. | Sulfuric acid purification process |
| JP3375050B2 (ja) * | 1997-03-31 | 2003-02-10 | 富士通株式会社 | 廃硫酸連続精製装置及び精製方法 |
| DE19920695A1 (de) * | 1999-05-05 | 2000-11-16 | Metallgesellschaft Ag | Verfahren zur Aufkonzentrierung von Dünnsäure |
| DE10055359C1 (de) * | 2000-11-08 | 2002-03-28 | Bayer Ag | Kontinuierliches isothermes Verfahren zur Herstellung von Mononitrotoluolen |
| DE10117207C1 (de) * | 2001-04-06 | 2002-11-14 | Bayer Ag | Kontinuierliches isothermes Verfahren zur Herstellung von Mononitrotoluolen in Gegenwart von Phosphorsäure |
| MY143253A (en) * | 2002-08-01 | 2011-04-15 | Gfe Patent As | Method and device for stripping ammonia from liquids |
| DE102004005913A1 (de) * | 2004-02-05 | 2005-08-25 | Basf Ag | Verfahren zur Herstellung von Dinitrotoluol |
| DE502006001608D1 (de) * | 2006-06-21 | 2008-10-30 | Qvf Engineering Gmbh | Verfahren und Anlage zur Konzentrierung von Abfall-Schwefelsäuren aus Nitrierprozessen |
| DE102006033722A1 (de) * | 2006-07-21 | 2008-01-24 | Bayer Materialscience Ag | Verfahren zur Herstellung von Dinitrotoluol |
| DE102007045699B3 (de) | 2007-09-24 | 2008-08-14 | Plinke Gmbh | Verfahren zum Konzentrieren von Schwefelsäure |
| HUE029763T2 (en) * | 2009-09-15 | 2017-04-28 | De Dietrich Process Systems Gmbh | Method and apparatus for processing sulfuric acid from waste from nitration processes |
| CN102008829B (zh) * | 2010-09-30 | 2012-09-05 | 温州市天龙轻工设备有限公司 | 一种真空多效强制循环蒸发装置及其浓缩物料的方法 |
| EP2809644B1 (de) | 2012-01-31 | 2016-09-28 | Covestro Deutschland AG | Verfahren und anlage zur herstellung von nitrobenzol |
| CN103373710B (zh) * | 2012-04-15 | 2016-05-11 | 辽阳环亚废酸再生科技有限公司 | 从生产苝系列颜料产生的废硫酸中回收硫酸的装置和方法 |
| CN103373711B (zh) * | 2012-04-15 | 2016-05-11 | 辽阳环亚废酸再生科技有限公司 | 从生产分散红60＃染料所产生的废硫酸中回收硫酸的装置和方法 |
| CN102951617B (zh) * | 2012-10-18 | 2014-10-22 | 陕西比迪欧化工有限公司 | 一种废硫酸净化处理系统及方法 |
| DE102013021026B4 (de) | 2013-12-19 | 2022-07-21 | Plinke Gmbh | Verfahren und Anlage zur Reinigung und Konzentrierung von Abfallsäure aus Nitrierprozessen |
| CN104596597B (zh) * | 2014-01-03 | 2018-10-30 | 黄东升 | 浓缩锅水份发蒸量标定法 |
| CN103908790B (zh) * | 2014-04-09 | 2015-09-30 | 陈晓程 | 一种栲胶生产蒸发工序的无动力自动转液方法 |
| CN103950903B (zh) * | 2014-05-13 | 2015-12-30 | 常州大学 | 用于处理硝酸异辛酯生产过程中的废酸的循环装置 |
| CN104248859A (zh) * | 2014-09-12 | 2014-12-31 | 四川大学 | 单程多效立管内降膜蒸发流程与设备布置方法 |
| JP6736547B2 (ja) | 2014-10-02 | 2020-08-05 | コベストロ、ドイチュラント、アクチエンゲゼルシャフトＣｏｖｅｓｔｒｏ Ｄｅｕｔｓｃｈｌａｎｄ Ａｇ | ジニトロトルエンの連続的製造方法における排出ガス清浄 |
| CN104671221B (zh) * | 2015-02-04 | 2017-02-22 | 江苏澄天环保科技有限公司 | 一种以排放二氧化硫为原料制取硫酸的方法及装置 |
| CN105923610B (zh) * | 2016-05-09 | 2018-06-12 | 杭州中昊科技有限公司 | 乙炔清净废酸再生工艺 |
| WO2018108739A1 (en) * | 2016-12-12 | 2018-06-21 | Haldor Topsøe A/S | A process for increasing the concentration of sulfuric acid and equipment for use in the process |
| CN106744720B (zh) * | 2016-12-18 | 2018-12-11 | 南通江山农药化工股份有限公司 | 三氯乙醛副产稀硫酸的循环再利用系统及其运行工艺 |
| CN106986314A (zh) * | 2017-03-29 | 2017-07-28 | 扬州祥发资源综合利用有限公司 | 一种中温碳化法处理高cod硫酸的方法及装置 |
| WO2018197539A1 (en) * | 2017-04-26 | 2018-11-01 | Solvay Sa | Reduction of content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or concentrated sulfuric acid |
| CN108658051B (zh) * | 2017-08-31 | 2020-10-30 | 宁夏中盛新科技有限公司 | 硝化废酸的回收方法、装置及其回收的硫酸 |
| CN107814362A (zh) * | 2017-11-06 | 2018-03-20 | 宁夏中盛新科技有限公司 | 一种从硝化废酸中回收硫酸的方法及装置 |
| CN107934921B (zh) * | 2017-11-27 | 2019-09-10 | 伊犁南岗化工有限责任公司 | 一种高效废硫酸提浓方法 |
| CN108264027B (zh) * | 2018-04-02 | 2020-07-14 | 湖南恒光化工有限公司 | 一种硫酸生产用硫酸净化方法 |
| CN109694043A (zh) * | 2018-12-27 | 2019-04-30 | 镇江江南化工有限公司 | 一种废硫酸综合处理回收利用的方法 |
| CN112028032A (zh) * | 2020-09-08 | 2020-12-04 | 江苏荣信环保科技有限公司 | 一种有机废硫酸中硫酸再生工艺 |
| US20230406704A1 (en) * | 2020-11-11 | 2023-12-21 | Basf Se | Process for concentrating diluted sulfuric acid |
| CN113045427A (zh) * | 2021-03-19 | 2021-06-29 | 宁夏华御化工有限公司 | 能够降低废水中硝酸盐含量的硝基氯苯制备方法及系统 |
| CN114588646B (zh) * | 2021-03-26 | 2024-10-18 | 江苏御镐智能制造有限公司 | 一种废酸浓缩处理塔 |
| CN117023524A (zh) * | 2023-07-14 | 2023-11-10 | 湖北东方化工有限公司 | 一种废硫酸双闪蒸浓缩装置及方法 |
| CN117776432B (zh) * | 2023-12-14 | 2025-10-28 | 南京华创环境技术研究院有限公司 | 一种染料行业产生废硫酸的回收处理方法及系统 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1969793A (en) * | 1931-08-10 | 1934-08-14 | Chemical Construction Corp | Concentrator apparatus |
| GB512907A (en) * | 1938-03-18 | 1939-09-28 | Nicolay Titlestad | Improvements relating to the concentration and decolorization of denitrated spent sulphuric acid |
| GB528696A (en) * | 1939-05-12 | 1940-11-05 | Bamag Ltd | Improvements relating to the concentration of sulphuric acid |
| US2414727A (en) * | 1945-05-22 | 1947-01-21 | Standard Oil Dev Co | Recovery of sulfuric acid |
| US4001383A (en) * | 1971-08-12 | 1977-01-04 | Stauffer Chemical Company | Impure sulfuric acid treatment process |
| IT1002065B (it) * | 1973-01-13 | 1976-05-20 | Texaco Ag | Procedimento per la produzione di alcooli inferiori |
| US3856673A (en) * | 1973-04-02 | 1974-12-24 | Air Prod & Chem | Purification of spent sulfuric acid |
| DE2360706C3 (de) * | 1973-12-06 | 1980-10-16 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Regeneration von Schwefelsäure |
| CH606940A5 (Direct) * | 1976-06-18 | 1978-11-30 | Bertrams Ag Hch | |
| DE2632989A1 (de) * | 1976-07-22 | 1978-02-02 | Hoechst Ag | Verfahren zum regenerieren von schwefelsaeure |
| US4155989A (en) * | 1977-11-14 | 1979-05-22 | Ciba-Geigy Corporation | Removal of nitric acid from nitric acid-sulfuric acid mixtures |
| DE2824010A1 (de) * | 1978-06-01 | 1979-12-13 | Metallgesellschaft Ag | Verfahren zur aufkonzentrierung von verduennter phosphorsaeure |
| US4409064A (en) * | 1978-10-16 | 1983-10-11 | Air Products And Chemicals, Inc. | Process for concentrating sulfuric acid in an evaporator |
| DE3927751A1 (de) * | 1989-08-23 | 1991-02-28 | Bayer Ag | Verfahren zum konzentrieren metallsulfathaltiger schwefelsaeure |
-
1993
- 1993-03-15 US US08/033,653 patent/US5275701A/en not_active Expired - Lifetime
- 1993-12-18 TW TW082110761A patent/TW282410B/zh not_active IP Right Cessation
-
1994
- 1994-03-08 PT PT94103524T patent/PT615951E/pt unknown
- 1994-03-08 EP EP94103524A patent/EP0615951B1/en not_active Expired - Lifetime
- 1994-03-08 DE DE69425170T patent/DE69425170T2/de not_active Expired - Lifetime
- 1994-03-14 KR KR1019940004970A patent/KR960012707B1/ko not_active Expired - Lifetime
- 1994-03-15 CN CN94102340A patent/CN1036575C/zh not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69425170D1 (de) | 2000-08-17 |
| DE69425170T2 (de) | 2000-12-21 |
| KR940021418A (ko) | 1994-10-17 |
| CN1094013A (zh) | 1994-10-26 |
| TW282410B (Direct) | 1996-08-01 |
| EP0615951A1 (en) | 1994-09-21 |
| KR960012707B1 (ko) | 1996-09-24 |
| CN1036575C (zh) | 1997-12-03 |
| EP0615951B1 (en) | 2000-07-12 |
| US5275701A (en) | 1994-01-04 |
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