Polychrome Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5021324 Printing plate protectantExpiredOct 05, 90Jun 04, 91[G03C]
4971899 Direct positive filmsExpiredMay 05, 89Nov 20, 90[G03C]
4960663 Persistent photoconductive coating compositionExpiredFeb 27, 89Oct 02, 90[G03G]
4868075 Electrophotographic imaging processExpiredMar 23, 88Sep 19, 89[G03G]
4822861 Method for the preparation of polyvinyl phosphonic acidExpiredMar 15, 88Apr 18, 89[C08F]
4782005 N,N'-diorgano dicarboxamides as oxygen inhibitors in radiation sensitive acrylate compositionsExpiredFeb 18, 88Nov 01, 88[G03C]
4758497 Photosensitive naphthoquinone diazide sulfonyl ester compounds for the fabrication of lithographic plates and photosensitive sheet construction with the compoundsExpiredApr 17, 87Jul 19, 88[C07C, G03C]
4735696 Method of electrolytically graining aluminum metal sheets suitable for lithographic plate supportsExpiredApr 27, 87Apr 05, 88[C25F]
4721552 Two-step method for electrolytically graining lithographic metal platesExpiredApr 27, 87Jan 26, 88[C25F]
4721665 Method for neutralizing acidic novolak resin in a lithographic coating compositionExpiredSep 29, 86Jan 26, 88[G03C]
4640884 Photosensitive compounds and lithographic composition or plate therewith having o-quinone diazide sulfonyl ester groupExpiredMar 29, 85Feb 03, 87[C07C, G03C]
4576892 Photosensitive materialsExpiredMar 12, 85Mar 18, 86[G03C, G03F]
4568628 Water developable diazo printing plate composition with quaternary nitrogen stabilizerExpiredOct 23, 84Feb 04, 86[G03C, G03F]
4568630 Method for preparing and using an anodized aluminum photo-lithographic printing plateExpiredAug 24, 84Feb 04, 86[G03F]
4559401 Process for preparing chromophore-substituted vinyl-halomethyl-s-triazinesExpiredJun 04, 84Dec 17, 85[C07D]
4552827 Planographic printing plate having cationic compound in interlayerExpiredAug 29, 84Nov 12, 85[G03C]
4548683 Method of electrolytically graining a lithographic plateExpiredSep 28, 84Oct 22, 85[C25F]
4545875 Electrolytic grainingExpiredAug 06, 84Oct 08, 85[C25F]
4524125 Chemical etching of lithographic aluminum substrateExpiredAug 13, 82Jun 18, 85[G03F]
D277293 Printing plate processor (II)ExpiredApr 10, 81Jan 22, 85[]

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