Petoca, Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6022518 Surface graphitized carbon material and process for producing the sameExpiredSep 24, 97Feb 08, 00[C01B]
5795843 Pitch-based activated carbon fiberExpiredFeb 07, 95Aug 18, 98[B01J]
5652058 Carbon fiber rovings for reinforcement of concreteExpiredJan 11, 95Jul 29, 97[D02G]
5643547 Process for producing carbon fibersExpiredJan 17, 95Jul 01, 97[D01F]
5629062 Fiber reinforced plastic pipe and process for producing the sameExpiredJan 03, 96May 13, 97[B32B]
5605618 Process for preparing nitrogen-containing isotropic pitch and nitrogen-containing isotropic pitchExpiredSep 07, 95Feb 25, 97[C10C]
5547363 Nozzle for spinning pitch-based carbon fibersExpiredJun 05, 95Aug 20, 96[D01D]
5494567 Process for producing carbon materialsExpiredOct 28, 94Feb 27, 96[C10C]
5446005 Pitch-based activated carbon fiberExpiredJun 22, 93Aug 29, 95[B01J]
5407614 Process of making pitch-based carbon fibersExpiredApr 20, 93Apr 18, 95[D01F]
5403660 Reinforcing carbon fiber and process for producing carbon-carbon compositeExpiredJun 13, 94Apr 04, 95[D02G, B32B, D04H]
5387333 Process for producing optically isotropic pitchExpiredMar 25, 92Feb 07, 95[C10L]
5356574 Process for producing pitch based activated carbon fibers and carbon fibersExpiredSep 10, 93Oct 18, 94[D01F]
5308599 Process for producing pitch-based carbon fiberExpiredJul 13, 92May 03, 94[D01F]
5292473 Process for preparing pitch for matrixExpiredJan 27, 93Mar 08, 94[D01F]
5272004 Carbon fibers and process for producing the sameExpiredNov 06, 92Dec 21, 93[D02G]
5256343 Method for producing pitch-based carbon fibersExpiredDec 31, 91Oct 26, 93[D01F]
5246639 Method for producing carbon-carbon composite materialsExpiredJun 04, 91Sep 21, 93[B05D]
5091164 Porous carbon-carbon composite and process for producing the sameExpiredDec 21, 89Feb 25, 92[C01B]
5071631 Porous carbon-carbon composite and process for producing the sameExpiredDec 20, 89Dec 10, 91[C01B]

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