CA2128719A1 - Production Method of High Purity Isomers of Benzenedicarboxylic Acids - Google Patents
Production Method of High Purity Isomers of Benzenedicarboxylic AcidsInfo
- Publication number
- CA2128719A1 CA2128719A1 CA2128719A CA2128719A CA2128719A1 CA 2128719 A1 CA2128719 A1 CA 2128719A1 CA 2128719 A CA2128719 A CA 2128719A CA 2128719 A CA2128719 A CA 2128719A CA 2128719 A1 CA2128719 A1 CA 2128719A1
- Authority
- CA
- Canada
- Prior art keywords
- oxidation
- solvent
- oxidized
- extraction
- post
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
- C07C63/14—Monocyclic dicarboxylic acids
- C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
- C07C63/26—1,4 - Benzenedicarboxylic acid
Abstract
Disclosed herein is a process for producing highly purified benzenedicarboxylic acid isomers without an additional catalytic reductive purification step, which comprises (a) an oxidation step wherein xylene isomer is oxidized with molecular oxygen or molecular oxygen containing gas in the presence of a catalyst system composed of cobalt, manganese, bromine and at least one selected from nickel; chrornium, zirconium and cerium in lower aliphatic carboxylic acid; and (b) an extraction/post-oxidation step wherein the oxidation product is crystallized to give cake of crude benzenedicarboxylic acid isomer, the cake is reslurried by adding lower aliphatic carboxylic acid solvent thereto followed by heating in order to extract impurities contained therein into the solvent, and the resulting slurry is oxidized with said catalyst system at a temperature of 2 - 80°C lower than that or said heating, each of said oxidation and extraction/post-oxidation being carried out once or twice, provided that any one or both of said steps should be carried out twice. According to the invention, the solvent employed to extract impurities is recycled from the subsequent oxidation steps.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU93046191 | 1993-09-28 | ||
RU93046191/04A RU2047595C1 (en) | 1993-09-28 | 1993-09-28 | Process for preparing phthalic acid isomers having high purification degree |
RU93046190/04A RU2047594C1 (en) | 1993-09-28 | 1993-09-28 | Process for preparing benzenedicarboxylic acid isomers having high purification degree |
RU93046190 | 1993-09-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2128719A1 true CA2128719A1 (en) | 1995-03-29 |
CA2128719C CA2128719C (en) | 1998-06-09 |
Family
ID=26653761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002128719A Expired - Lifetime CA2128719C (en) | 1993-09-28 | 1993-11-30 | Production method of high purity isomers of benzenedicarboxylic acids |
Country Status (21)
Country | Link |
---|---|
US (1) | US5359133A (en) |
JP (1) | JP3009223B2 (en) |
KR (1) | KR970000136B1 (en) |
CN (1) | CN1050118C (en) |
AU (1) | AU5576394A (en) |
BE (1) | BE1008546A4 (en) |
BG (1) | BG62324B1 (en) |
BR (1) | BR9305996A (en) |
CA (1) | CA2128719C (en) |
DE (2) | DE4397599C2 (en) |
ES (1) | ES2081265B1 (en) |
FR (1) | FR2710638B1 (en) |
GB (1) | GB2286588B (en) |
IT (1) | IT1271011B (en) |
MY (1) | MY108978A (en) |
PL (1) | PL175685B1 (en) |
RO (1) | RO113850B1 (en) |
SA (1) | SA94140587B1 (en) |
SK (1) | SK280582B6 (en) |
TW (1) | TW307753B (en) |
WO (1) | WO1995009143A1 (en) |
Families Citing this family (78)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5929274A (en) * | 1995-06-07 | 1999-07-27 | Hfm International, Inc. | Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid |
WO1996041791A1 (en) * | 1995-06-08 | 1996-12-27 | Mogilev Order Of Lenin Proizvodstvennoe Obiedinenie | Method of obtaining terephthalic acid of monomeric purity |
JP3757995B2 (en) * | 1996-07-12 | 2006-03-22 | 三菱瓦斯化学株式会社 | Method for producing high purity isophthalic acid |
JP3341620B2 (en) * | 1997-03-19 | 2002-11-05 | 株式会社日立製作所 | Method and apparatus for producing aromatic polycarboxylic acid |
KR100549107B1 (en) * | 1999-04-28 | 2006-02-06 | 삼성토탈 주식회사 | Production method of aromatic polycarboxylic acids |
US6180822B1 (en) | 1998-12-22 | 2001-01-30 | Samsung General Chemical Co., Ltd. | Method of producing aromatic carboxylic acids by oxidizing alkyl aromatic compounds or partially oxidized intermediates thereof with carbon dioxide containing gas |
KR20000041506A (en) * | 1998-12-22 | 2000-07-15 | 유현식 | Method for the preparation of aromatic polycarbonic acid |
US6194607B1 (en) | 1998-12-22 | 2001-02-27 | Samsung General Chemicals Co., Ltd. | Method of producing aromatic carboxylic acids by oxidizing alkyl aromatic hydrocarbons or partially oxidized intermediates thereof |
US6399790B1 (en) | 1999-11-24 | 2002-06-04 | General Electric Company | Method for oxidation of xylene derivatives |
US6465685B1 (en) | 1999-11-24 | 2002-10-15 | General Electric Company | Method for oxidation of xylene derivatives |
CN1207259C (en) | 2000-01-18 | 2005-06-22 | 因卡国际公司 | Oxidation of alkyl aromatic compounds to aromatic acids in an aqueous medium |
US6657068B2 (en) | 2002-03-22 | 2003-12-02 | General Electric Company | Liquid phase oxidation of halogenated ortho-xylenes |
US6649773B2 (en) | 2002-03-22 | 2003-11-18 | General Electric Company | Method for the manufacture of halophthalic acids and anhydrides |
US6657067B2 (en) | 2002-03-22 | 2003-12-02 | General Electric Company | Method for the manufacture of chlorophthalic anhydride |
US7074954B2 (en) * | 2002-12-09 | 2006-07-11 | Eastman Chemical Company | Process for the oxidative purification of terephthalic acid |
CA2505977C (en) * | 2002-12-09 | 2009-08-25 | Eastman Chemical Company | Process for the oxidative purification of terephthalic acid |
AU2003293252A1 (en) * | 2002-12-09 | 2004-06-30 | Eastman Chemical Company | Process for the oxidative purification of terephthalic acid |
US7132566B2 (en) * | 2003-09-22 | 2006-11-07 | Eastman Chemical Company | Process for the purification of a crude carboxylic acid slurry |
US7161027B2 (en) * | 2002-12-09 | 2007-01-09 | Eastman Chemical Company | Process for the oxidative purification of terephthalic acid |
MXPA05006046A (en) * | 2002-12-09 | 2005-08-18 | Eastman Chem Co | Process for the purification of a crude carboxylic acid slurry. |
US7546747B2 (en) * | 2004-01-15 | 2009-06-16 | Eastman Chemical Company | Process for production of a dried carboxylic acid cake suitable for use in polyester production |
US7348452B2 (en) * | 2004-04-22 | 2008-03-25 | Eastman Chemical Company | Liquid phase oxidation of P-xylene to terephthalic acid in the presence of a catalyst system containing nickel, manganese, and bromine atoms |
US20050283022A1 (en) * | 2004-06-18 | 2005-12-22 | Sheppard Ronald B | Filtrate preparation process for terephthalic acid filtrate treatment |
US7541489B2 (en) | 2004-06-30 | 2009-06-02 | Sabic Innovative Plastics Ip B.V. | Method of making halophthalic acids and halophthalic anhydrides |
US7568361B2 (en) | 2004-09-02 | 2009-08-04 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7910769B2 (en) | 2004-09-02 | 2011-03-22 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7589231B2 (en) | 2004-09-02 | 2009-09-15 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7692037B2 (en) | 2004-09-02 | 2010-04-06 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7371894B2 (en) * | 2004-09-02 | 2008-05-13 | Eastman Chemical Company | Optimized liquid-phase oxidation |
WO2006028817A2 (en) * | 2004-09-02 | 2006-03-16 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7683210B2 (en) | 2004-09-02 | 2010-03-23 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7504535B2 (en) | 2004-09-02 | 2009-03-17 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7741515B2 (en) | 2004-09-02 | 2010-06-22 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7615663B2 (en) * | 2004-09-02 | 2009-11-10 | Eastman Chemical Company | Optimized production of aromatic dicarboxylic acids |
US7507857B2 (en) | 2004-09-02 | 2009-03-24 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7381836B2 (en) | 2004-09-02 | 2008-06-03 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7572936B2 (en) | 2004-09-02 | 2009-08-11 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7582793B2 (en) | 2004-09-02 | 2009-09-01 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7692036B2 (en) | 2004-11-29 | 2010-04-06 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US7550627B2 (en) * | 2005-03-08 | 2009-06-23 | Eastman Chemical Company | Processes for producing aromatic dicarboxylic acids |
US20060205974A1 (en) * | 2005-03-08 | 2006-09-14 | Lavoie Gino G | Processes for producing aromatic dicarboxylic acids |
US7834208B2 (en) * | 2005-05-19 | 2010-11-16 | Eastman Chemical Company | Process to produce a post catalyst removal composition |
US7741516B2 (en) * | 2005-05-19 | 2010-06-22 | Eastman Chemical Company | Process to enrich a carboxylic acid composition |
US7919652B2 (en) * | 2005-05-19 | 2011-04-05 | Eastman Chemical Company | Process to produce an enriched composition through the use of a catalyst removal zone and an enrichment zone |
US7557243B2 (en) * | 2005-05-19 | 2009-07-07 | Eastman Chemical Company | Enriched terephthalic acid composition |
US20060264662A1 (en) * | 2005-05-19 | 2006-11-23 | Gibson Philip E | Esterification of an enriched composition |
US7432395B2 (en) * | 2005-05-19 | 2008-10-07 | Eastman Chemical Company | Enriched carboxylic acid composition |
US20060264656A1 (en) * | 2005-05-19 | 2006-11-23 | Fujitsu Limited | Enrichment process using compounds useful in a polyester process |
US20060264664A1 (en) * | 2005-05-19 | 2006-11-23 | Parker Kenny R | Esterification of an exchange solvent enriched composition |
US7880031B2 (en) * | 2005-05-19 | 2011-02-01 | Eastman Chemical Company | Process to produce an enrichment feed |
US7884231B2 (en) * | 2005-05-19 | 2011-02-08 | Eastman Chemical Company | Process to produce an enriched composition |
US7897809B2 (en) * | 2005-05-19 | 2011-03-01 | Eastman Chemical Company | Process to produce an enrichment feed |
US7884232B2 (en) | 2005-06-16 | 2011-02-08 | Eastman Chemical Company | Optimized liquid-phase oxidation |
US20070155987A1 (en) * | 2006-01-04 | 2007-07-05 | O'meadhra Ruairi S | Oxidative digestion with optimized agitation |
US20070179312A1 (en) * | 2006-02-02 | 2007-08-02 | O'meadhra Ruairi Seosamh | Process for the purification of a crude carboxylic axid slurry |
US20070208194A1 (en) * | 2006-03-01 | 2007-09-06 | Woodruff Thomas E | Oxidation system with sidedraw secondary reactor |
US7816556B2 (en) * | 2006-03-01 | 2010-10-19 | Eastman Chemical Company | Polycarboxylic acid production system employing enhanced multistage oxidative digestion |
US7772424B2 (en) * | 2006-03-01 | 2010-08-10 | Eastman Chemical Company | Polycarboxylic acid production system employing enhanced evaporative concentration downstream of oxidative digestion |
US7326808B2 (en) * | 2006-03-01 | 2008-02-05 | Eastman Chemical Company | Polycarboxylic acid production system employing cooled mother liquor from oxidative digestion as feed to impurity purge system |
US7393973B2 (en) * | 2006-03-01 | 2008-07-01 | Eastman Chemical Company | Polycarboxylic acid production system with enhanced residence time distribution for oxidative digestion |
US7501537B2 (en) * | 2006-03-01 | 2009-03-10 | Eastman Chemical Company | Polycarboxylic acid production system employing oxidative digestion with reduced or eliminated upstream liquor exchange |
US7888529B2 (en) * | 2006-03-01 | 2011-02-15 | Eastman Chemical Company | Process to produce a post catalyst removal composition |
US7326807B2 (en) * | 2006-03-01 | 2008-02-05 | Eastman Chemical Company | Polycarboxylic acid production system with enhanced heating for oxidative digestion |
US7420082B2 (en) * | 2006-03-01 | 2008-09-02 | Eastman Chemical Company | Polycarboxylic acid production system employing hot liquor removal downstream of oxidative digestion |
WO2008082501A1 (en) * | 2006-12-21 | 2008-07-10 | E.I. Du Pont De Nemours And Company | Process for the synthesis of halogenated aromatic diacids |
US8614350B2 (en) | 2008-01-15 | 2013-12-24 | Eastman Chemical Company | Carboxylic acid production process employing solvent from esterification of lignocellulosic material |
US8455680B2 (en) | 2008-01-15 | 2013-06-04 | Eastman Chemical Company | Carboxylic acid production process employing solvent from esterification of lignocellulosic material |
US8927764B2 (en) | 2011-12-29 | 2015-01-06 | Uop Llc | Process for producing terephthalic acid |
US9024059B2 (en) | 2011-12-29 | 2015-05-05 | Uop Llc | Process for producing terephthalic acid |
CN104011005A (en) * | 2011-12-29 | 2014-08-27 | 环球油品公司 | Process for producing terephthalic acid |
US9085522B2 (en) | 2011-12-29 | 2015-07-21 | Uop Llc | Process for producing terephthalic acid |
US9045408B2 (en) | 2011-12-29 | 2015-06-02 | Uop Llc | Process for oxidizing alkyl-aromatic compounds |
US9156765B2 (en) | 2011-12-29 | 2015-10-13 | Uop Llc | Process for oxidizing alkyl-aromatic compounds |
US9212121B2 (en) * | 2013-09-24 | 2015-12-15 | Eastman Chemical Company | Processes for producing terephthalic acid |
US9199906B2 (en) | 2013-09-24 | 2015-12-01 | Eastman Chemical Company | Processes for producing isophthalic acid |
CN105688988B (en) * | 2014-12-16 | 2018-11-27 | 财团法人工业技术研究院 | Oxidation reaction catalyst for furfural compound and oxidation method for furfural compound |
CN107954850A (en) * | 2017-11-02 | 2018-04-24 | 华东理工大学 | The preparation method of M-phthalic acid |
CN107963964A (en) * | 2017-11-02 | 2018-04-27 | 华东理工大学 | The preparation method of M-phthalic acid |
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DE1270030C2 (en) * | 1962-04-27 | 1973-07-19 | METHOD FOR PURIFYING TEREPHTHALIC ACID | |
US3595908A (en) * | 1966-11-01 | 1971-07-27 | Inst Francais Du Petrole | Two-step oxidation of paraxylene for the production of terephthalic acid |
DE1643721B1 (en) * | 1967-12-22 | 1971-10-21 | Basf Ag | Process for the continuous production of benzene dicarboxylic acids |
US3626001A (en) * | 1968-05-09 | 1971-12-07 | Atlantic Richfield Co | Method for the production of high-purity isophthalic or terephthalic acid |
US3683017A (en) * | 1970-04-01 | 1972-08-08 | Fmc Corp | Oxidation of p-xylene and p-tolujc acid to terephthalic acid |
JPS5518698B1 (en) * | 1971-04-03 | 1980-05-21 | ||
US3845117A (en) * | 1972-12-14 | 1974-10-29 | Halcon International Inc | Process for preparation of phthalic acids |
US3920735A (en) * | 1973-05-21 | 1975-11-18 | Standard Oil Co | Zirconium enhanced activity of transition metal-bromine catalysis of di- and trimethyl benzene oxidation in liquid phase |
JPS5291835A (en) * | 1976-01-29 | 1977-08-02 | Mitsubishi Chem Ind Ltd | Prepation of terephtalic acid for direct polymerization |
US4201871A (en) * | 1978-02-23 | 1980-05-06 | Asahi Kasei Kogyo Kabushiki Kaisha | Process for recovering terephthalic acid |
JPS5555138A (en) * | 1978-10-19 | 1980-04-22 | Mitsubishi Chem Ind Ltd | Preparation of highly pure terephthalic acid |
EP0021747B1 (en) * | 1979-07-02 | 1983-05-18 | Imperial Chemical Industries Plc | Process for the preparation of terephthalic acid |
US4334086A (en) * | 1981-03-16 | 1982-06-08 | Labofina S.A. | Production of terephthalic acid |
JPS57200328A (en) * | 1981-06-03 | 1982-12-08 | Mitsubishi Chem Ind Ltd | Preparation of terephthalic acid |
JPS59104345A (en) * | 1982-12-03 | 1984-06-16 | Kuraray Yuka Kk | Production of terephthalic acid suitable for direct polymerization |
JPS59106435A (en) * | 1982-12-10 | 1984-06-20 | Mitsubishi Chem Ind Ltd | Production of high-purity terephthalic acid |
JPS60233032A (en) * | 1984-05-04 | 1985-11-19 | Kuraray Yuka Kk | Production of terephthalic acid suitable for direct polymerization |
US4892970A (en) * | 1985-12-30 | 1990-01-09 | Amoco Corporation | Staged aromatics oxidation in aqueous systems |
JPH0662495B2 (en) * | 1986-05-16 | 1994-08-17 | 三菱化成株式会社 | Manufacturing method of high-purity terephthalic acid |
JP2504461B2 (en) * | 1987-04-24 | 1996-06-05 | 三菱化学株式会社 | Manufacturing method of high quality terephthalic acid |
US4786753A (en) * | 1987-05-18 | 1988-11-22 | Amoco Corporation | Oxidation process for the manufacture of aromatic acids from alkylaromatic compounds |
DE69104280T2 (en) * | 1990-06-25 | 1995-02-16 | Mitsubishi Gas Chemical Co | Process for the production of high-purity isophthalic acid. |
CA2050866A1 (en) * | 1990-09-10 | 1992-03-11 | George F. Schaefer | Oxidation of dialkyl polyaromatics to dicarboxypolyaromatics |
JP3231134B2 (en) * | 1993-05-11 | 2001-11-19 | 住友化学工業株式会社 | Particle measuring method and device therefor |
-
1993
- 1993-10-14 KR KR1019930021276A patent/KR970000136B1/en not_active IP Right Cessation
- 1993-10-27 US US08/141,738 patent/US5359133A/en not_active Expired - Lifetime
- 1993-11-30 PL PL93308537A patent/PL175685B1/en unknown
- 1993-11-30 RO RO94-01218A patent/RO113850B1/en unknown
- 1993-11-30 JP JP6516877A patent/JP3009223B2/en not_active Expired - Lifetime
- 1993-11-30 SK SK877-94A patent/SK280582B6/en not_active IP Right Cessation
- 1993-11-30 AU AU55763/94A patent/AU5576394A/en not_active Abandoned
- 1993-11-30 DE DE4397599A patent/DE4397599C2/en not_active Expired - Lifetime
- 1993-11-30 ES ES09450020A patent/ES2081265B1/en not_active Expired - Fee Related
- 1993-11-30 BR BR9305996A patent/BR9305996A/en not_active IP Right Cessation
- 1993-11-30 GB GB9415915A patent/GB2286588B/en not_active Expired - Lifetime
- 1993-11-30 CA CA002128719A patent/CA2128719C/en not_active Expired - Lifetime
- 1993-11-30 DE DE4397599T patent/DE4397599T1/en active Pending
- 1993-11-30 WO PCT/KR1993/000106 patent/WO1995009143A1/en active Application Filing
- 1993-12-30 MY MYPI93002874A patent/MY108978A/en unknown
-
1994
- 1994-01-12 CN CN94100679A patent/CN1050118C/en not_active Expired - Lifetime
- 1994-01-20 TW TW083100473A patent/TW307753B/zh not_active IP Right Cessation
- 1994-03-06 SA SA94140587A patent/SA94140587B1/en unknown
- 1994-07-20 BG BG98919A patent/BG62324B1/en unknown
- 1994-07-26 BE BE9400702A patent/BE1008546A4/en not_active IP Right Cessation
- 1994-09-14 IT ITMI941879A patent/IT1271011B/en active IP Right Grant
- 1994-09-21 FR FR9411253A patent/FR2710638B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR970000136B1 (en) | 1997-01-04 |
CN1103860A (en) | 1995-06-21 |
RO113850B1 (en) | 1998-11-30 |
JP3009223B2 (en) | 2000-02-14 |
BG62324B1 (en) | 1999-08-31 |
BE1008546A4 (en) | 1996-06-04 |
ITMI941879A0 (en) | 1994-09-14 |
PL175685B1 (en) | 1999-01-29 |
DE4397599T1 (en) | 1997-07-24 |
TW307753B (en) | 1997-06-11 |
GB9415915D0 (en) | 1995-05-24 |
AU5576394A (en) | 1995-04-18 |
ES2081265B1 (en) | 1996-10-16 |
CN1050118C (en) | 2000-03-08 |
IT1271011B (en) | 1997-05-26 |
ITMI941879A1 (en) | 1996-03-14 |
GB2286588B (en) | 1996-09-11 |
MY108978A (en) | 1996-11-30 |
BG98919A (en) | 1995-05-31 |
BR9305996A (en) | 1997-10-21 |
PL308537A1 (en) | 1995-08-21 |
GB2286588A (en) | 1995-08-23 |
SK87794A3 (en) | 1995-05-10 |
US5359133A (en) | 1994-10-25 |
CA2128719C (en) | 1998-06-09 |
SA94140587B1 (en) | 2006-11-12 |
KR950008467A (en) | 1995-04-17 |
WO1995009143A1 (en) | 1995-04-06 |
DE4397599C2 (en) | 1998-02-19 |
ES2081265A1 (en) | 1996-02-16 |
FR2710638B1 (en) | 1996-04-26 |
JPH08506571A (en) | 1996-07-16 |
FR2710638A1 (en) | 1995-04-07 |
SK280582B6 (en) | 2000-04-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20131202 |