Japan Styrene Paper Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5281119 Apparatus for the production of foamed polyolefin sheetsExpiredOct 07, 92Jan 25, 94[B29D]
5281377 Process for the production of foamed polyolefin sheetsExpiredOct 13, 92Jan 25, 94[B29D]
5015667 Pre-foamed beads of polyethylene base resinExpiredNov 02, 88May 14, 91[C08V]
4948817 Pre-foamed particles of uncrosslinked, linear low-density polyethylene and production method thereofExpiredJun 08, 88Aug 14, 90[C08J]
4889671 Production method of prefoamed particles of polyolefin resinExpiredMay 11, 88Dec 26, 89[C08J]
4840973 Polypropylene resin prefoamed particlesExpiredAug 07, 87Jun 20, 89[C08J]
4822542 Method of production of expansion-molded article, from foamable thermoplastic resin particles and apparatus thereforExpiredJul 23, 87Apr 18, 89[C08J, B29C]
4810316 Process for producing a foamed base material for car ceiling memberExpiredSep 01, 87Mar 07, 89[B29C, B32B]
4806293 Method of producing a foamed, molded articleExpiredApr 10, 87Feb 21, 89[B29C]
RE32780 Core material for an automobile bumperExpiredSep 17, 87Nov 08, 88[B32B]
4777000 Production method of expansion-molded article of polypropylene resinExpiredNov 25, 86Oct 11, 88[C08J]
4769393 Expanded particles of modified polyethylene and foamed articles obtained therefromExpiredNov 04, 86Sep 06, 88[C08J]
4756948 Core material for automobile bumpersExpiredJul 21, 87Jul 12, 88[B32B]
4749725 Production process of pre-foamed particlesExpiredFeb 18, 86Jun 07, 88[C08J]
4716021 Heat treatment apparatus for polyolefin resin particlesExpiredJul 09, 86Dec 29, 87[B01F]
4711287 Casting methodExpiredFeb 19, 86Dec 08, 87[B22C]
4707569 Multi-conductor cableExpiredMay 23, 86Nov 17, 87[H01B]
4704239 Process for the production of expanded particles of a polymeric materialExpiredApr 24, 85Nov 03, 87[C08J]
4695593 Prefoamed propylene polymer-base particles, expansion-molded article produced from said particles and production process of said articleExpiredFeb 21, 86Sep 22, 87[C08J]
4692507 Propylene-base random copolymer particles and production process thereofExpiredApr 16, 86Sep 08, 87[C08F]

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