JAPAN PMC CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5756646 Agent for improving surface quality of paperExpiredMar 15, 96May 26, 98[C08G]
5698627 Additive for papermakingExpiredMar 29, 96Dec 16, 97[C08K]
5454907 Method of refining woodchips or beating wood pulp with a selectively sulfonated chitosanExpiredFeb 15, 94Oct 03, 95[D21B]
5438087 Paper sizing compositionExpiredJun 21, 93Aug 01, 95[C08L]
5393337 Rosin emulsion sizing agent, paper sized therewith and method of sizing using the sameExpiredOct 15, 92Feb 28, 95[C09D, D21H]
5270355 Paper coating resin and paper coating compositionExpiredJan 13, 92Dec 14, 93[C08K]
5229504 Process for preparing a sulfonated chitosanExpiredSep 06, 91Jul 20, 93[C07H, A61K, C08B]
5115065 Polymeric papermaking additiveExpiredMar 09, 88May 19, 92[L08F]
5079303 Surface treatment agent for paperExpiredJul 12, 89Jan 07, 92[C08F]
5013775 Sizing composition and sizing methodExpiredApr 27, 89May 07, 91[C08K]
4943608 Rosin emulsion sizing agentExpiredOct 29, 87Jul 24, 90[C08L]
4717758 Papermaking additiveExpiredAug 21, 86Jan 05, 88[C08F]
4681909 Rosin emulsion sizing agentExpiredOct 22, 85Jul 21, 87[C08L]
4654386 Ketene dimer-acrylamide polymer aqueous dispersionExpiredSep 04, 85Mar 31, 87[C08L]

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