MIDBRAKE CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4,313,454 Hydraulic brake booster pressure limiterExpiredDec 12, 79Feb 02, 82[B60T, G05D]
4,302,057 Pneumatic control valveExpiredDec 27, 79Nov 24, 81[B60T]
4,300,583 Hydraulic booster valveExpiredDec 12, 79Nov 17, 81[F16K, F15B]
4,294,071 Hydraulic booster travel ratio check valveExpiredDec 12, 79Oct 13, 81[B60T]
4,290,342 Hydraulic booster valveExpiredDec 14, 79Sep 22, 81[F15B]
4,279,273 Clutch retention feature of a hand control valveExpiredFeb 04, 80Jul 21, 81[F16K]
4,207,563 Gas charged accumulator with failure indicatorExpiredJun 08, 78Jun 10, 80[F16K, G08B]
4,207,564 Piston overtravel indicatorExpiredJun 12, 78Jun 10, 80[B60Q, H01H, G08B]
4,207,565 Piston overtravel indicatorExpiredJun 12, 78Jun 10, 80[B60Q, H01H, G08B]
4,206,455 Piston overtravel indicatorExpiredJun 09, 78Jun 03, 80[B60Q, H01H, G08B]
4,204,555 Exhaust valve assemblyExpiredJun 12, 78May 27, 80[F16K]
4,194,522 Air pressure regulatorExpiredApr 03, 78Mar 25, 80[F16K, G05D]
4,191,428 Air brake system with pressure holding valveExpiredJul 28, 78Mar 04, 80[B60T]
4,187,717 Apparatus and method for testing products for leaksExpiredJun 19, 78Feb 12, 80[G01M]

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