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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4816242 Production of partially carbonized polymeric fibrous material having an electrical resistivity of enhanced stabilityExpiredOct 11, 85Mar 28, 89[D01F]
4714642 Carbon fiber multifilamentary tow which is particularly suited for weaving and/or resin impregnationExpiredJun 27, 85Dec 22, 87[B32B]
4633550 Yarn entangling apparatusExpiredMar 29, 85Jan 06, 87[D02J, D02G]
4534919 Production of a carbon fiber multifilamentary tow which is particularly suited for resin impregnationExpiredAug 30, 83Aug 13, 85[D01F]
4473372 Process for the stabilization of acrylic fibersExpiredMay 12, 83Sep 25, 84[H05B, B06B]
4460708 Production of activated carbon fibers from acid contacted polybenzimidazole fibrous materialExpiredMay 06, 83Jul 17, 84[C01B, D01F]
4452601 Process for the thermal stabilization of acrylic fibers and filmsExpiredMar 19, 82Jun 05, 84[C01B]
4446255 Sized carbon fibers suitable for use in composites of improved impact resistanceExpiredDec 29, 82May 01, 84[B05D, B32B, C08K]
4443566 Sized reinforcing fibers suitable for use in composites of improved impact resistanceExpiredApr 25, 83Apr 17, 84[D02G, B32B]
4416924 Polycarbonate sizing finish and method of application thereofExpiredSep 23, 82Nov 22, 83[B05D]
4411880 Process for disposing of carbon fibersExpiredMay 17, 82Oct 25, 83[D01F]
4395514 Process for preparing a carbon fiber reinforced composite article which utilizes a polyimide matrixExpiredJan 29, 82Jul 26, 83[C08L]
4394467 Sized carbon fibers capable of use with polyimide matrixExpiredJun 22, 81Jul 19, 83[D02G, B32B]
4388227 Intercalation of graphitic carbon fibersExpiredMar 02, 79Jun 14, 83[D01F]
4380483 Process for forming improved carbon fiber reinforced composite coil springExpiredSep 24, 80Apr 19, 83[B65H, F16F]
4374114 Process for the surface modification of carbon fibersExpiredJan 05, 81Feb 15, 83[D01F]
4370141 Process for the thermal stabilization of acrylic fibersExpiredMay 18, 81Jan 25, 83[C01B]
D267499 Game boardExpiredSep 30, 80Jan 04, 83[D210]
4364916 Process for the production of stabilized acrylic fibers which are particularly suited for thermal conversion to carbon fibersExpiredOct 14, 81Dec 21, 82[D01F]
4364993 Sized carbon fibers, and thermoplastic polyester based composite structures employing the sameExpiredJul 14, 80Dec 21, 82[C09J, B05D, C08K, D04H]

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