Seitetsu Kagaku Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5175372 Process of producing high purity bis(4-hydroxyphenyl)sulfides and heat-sensitive recording materials containing the sameExpiredApr 10, 91Dec 29, 92[C07C]
5102858 Heat-sensitive recording materials containing high purity bis(4-hydroxyphenyl)sulfidesExpiredJun 12, 89Apr 07, 92[B41M]
5101049 Novel thiophene derivatives and methods for producing the sameExpiredAug 20, 90Mar 31, 92[C07D]
5075373 Water retention material with water-absorbencyExpiredJan 30, 89Dec 24, 91[C08L]
4990450 Method of producing endo-.alpha.-N-acetylgalactosaminidase from microorganismsExpiredMay 02, 88Feb 05, 91[C12R, C12P, C12N]
4986835 Process for separating and recovering carbonic acid gas from gas mixture by adsorptionExpiredAug 23, 89Jan 22, 91[B01D]
4985052 Process for producing high purity oxygen gas from airExpiredJul 18, 88Jan 15, 91[B01D]
4981699 Method of preparing an edible composition and product resulting therefromExpiredMar 23, 90Jan 01, 91[A23L]
4972019 Water-absorbent resin compositionExpiredJun 20, 89Nov 20, 90[C08K]
4968787 Method for treating glycosideExpiredJul 27, 87Nov 06, 90[C07H]
4943655 Salt of 5-acetyl-2-alkylbenzenesulfonic acidExpiredMar 24, 89Jul 24, 90[C07C]
4917710 Process for recovering oxygen enriched gasExpiredFeb 23, 89Apr 17, 90[B01D]
4880888 Process for producing a water-absorbent resinExpiredJan 05, 87Nov 14, 89[C08F]
4865882 Method for powder coating of metallic articlesExpiredJul 26, 88Sep 12, 89[B05D]
4863989 Water-absorbent resin compositionExpiredMay 26, 87Sep 05, 89[C08K]
4853158 Process for preparing N,N-dialkylaniline salt of 5-acetyl-2-alkylbenzene sulfonic acidExpiredMar 25, 88Aug 01, 89[C07C]
4849138 Method of producing alkali metal benzenesulfinatesExpiredAug 12, 87Jul 18, 89[C07C]
4835317 4-tert.-butyl-1,2-benzenedithiol, complex compounds derived therefrom, and a method of producing the sameExpiredJan 13, 88May 30, 89[C07C]
4807615 Method for anesthetizing aquatic animalsExpiredSep 08, 87Feb 28, 89[A01K]
4792612 Thiophene derivatives and methods for producing the sameExpiredMar 21, 88Dec 20, 88[C07D]

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