W.S. SHAMBAN & COMPANY A CORP. OF DELAWARE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4850602 Fluid seal and rod wiper assemblyExpiredNov 30, 87Jul 25, 89[F16J]
4576386 Anti-extrusion back-up ring assemblyExpiredJan 16, 85Mar 18, 86[F16J]
4570944 Seal assembly with reduced wear low pressure sealing ringExpiredMay 15, 85Feb 18, 86[F16J]
4566702 Seal assembly with improved low pressure sealing ringExpiredMar 18, 85Jan 28, 86[F16F]
4448429 Elastomer energized sealExpiredSep 30, 82May 15, 84[F16J]
4268045 Seal assemblyExpiredJun 16, 80May 19, 81[F16J]
4231578 Seal assemblyExpiredApr 23, 79Nov 04, 80[F16F]

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