Commercial Shearing, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4879501 Constant speed hydrostatic drive systemExpiredDec 10, 82Nov 07, 89[G05D]
4839935 Mini arched bridgeExpiredJul 13, 87Jun 20, 89[E01D]
4835359 Method of manufacturing hemispherical tank headsExpiredFeb 18, 88May 30, 89[B23K]
4830536 Method and apparatus for tunnel liningExpiredJul 25, 84May 16, 89[E21D]
4825752 End-of-stroke bypass valve in piston for impact relief in hydraulic tilt and trim cylinderExpiredDec 14, 87May 02, 89[F16K, F15B]
4803415 Stepper motor control circuit and apparatusExpiredOct 07, 87Feb 07, 89[H02P]
4789002 Fluid valve structuresExpiredMar 26, 87Dec 06, 88[F15B]
4777981 Magnetic detent joy stick and stack remote control valvesExpiredMay 18, 87Oct 18, 88[F15B]
4744288 Axial piston pumps and motorsExpiredAug 28, 86May 17, 88[F01B]
4709724 Fluid valve structuresExpiredJan 17, 86Dec 01, 87[F15B]
4682939 Gear pump or motor with tooth tips of dissimilar metalExpiredMar 25, 86Jul 28, 87[F04C, F03C]
4636155 Hydraulic seal having U-shaped gasket and a plurality of plastically deformable postsExpiredJun 29, 84Jan 13, 87[F04C, F01C]
4585024 Air shift conversion apparatus for manual valvesExpiredAug 28, 84Apr 29, 86[F15B]
4569367 Hydraulic valve inlet unloadersExpiredJan 14, 85Feb 11, 86[F15B]
4569372 Remote valve operatorsExpiredAug 28, 84Feb 11, 86[F15B]
4565469 CribbingExpiredNov 13, 84Jan 21, 86[E21D]
4519419 Hydraulic valvesExpiredJun 15, 82May 28, 85[F15B]
4519420 Hydraulic valvesExpiredSep 29, 82May 28, 85[F15B]
4497597 CribbingExpiredAug 25, 82Feb 05, 85[E21D]
4470776 Methods and apparatus for gear pump lubricationExpiredNov 28, 79Sep 11, 84[F04C]

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