Karl Schmidt GmbH

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4581983 Piston for internal combustion enginesExpiredMay 07, 80Apr 15, 86[B23P, B23K, F01B, F16J]
4562327 Piston and process of providing wear-resisting surfaces in the ring grooves of an aluminum alloy combustion engine pistonExpiredDec 12, 83Dec 31, 85[B23K]
4532868 Rotating band for projectilesExpiredDec 22, 83Aug 06, 85[F42B]
4510821 Device for making a firm, but releasable joint between a steering wheel and a locking boltExpiredSep 23, 83Apr 16, 85[B62D]
4495684 Process of joining a ceramic insert which is adapted to be embedded in a light metal casting for use in internal combustion enginesExpiredSep 27, 82Jan 29, 85[B23P]
4448091 Single-spoke steering wheelExpiredNov 24, 80May 15, 84[B62D]
4394275 Composite material for sliding surface bearingsExpiredJul 15, 81Jul 19, 83[C10M]
4375782 Composite piston for internal combustion enginesExpiredApr 08, 80Mar 08, 83[F02F]
4368697 Liquid-cooled piston for internal combustion enginesExpiredMar 04, 81Jan 18, 83[F01P]
4356800 Liquid-cooled, composite piston for internal-combustion enginesExpiredJul 16, 79Nov 02, 82[F02F]
4354426 Expansion-controlled light alloy pistonExpiredDec 03, 80Oct 19, 82[F16J]
4353266 Motor vehicle steering wheel comprising a deformable memberExpiredNov 07, 78Oct 12, 82[G05G]
4345138 Process of shaping the rim of a combustion chamber recess of a light-alloy pistonExpiredNov 24, 80Aug 17, 82[B23P]
4274372 Lightweight piston for internal combustion enginesExpiredSep 20, 79Jun 23, 81[F16J]
4262551 Safety steering wheel for motor vehiclesExpiredJul 06, 78Apr 21, 81[G05G]
4221403 Three-point safety beltExpiredDec 02, 77Sep 09, 80[B60R]
4200309 Safety steering wheel for motor vehiclesExpiredJul 24, 78Apr 29, 80[B60R]

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