MARK CONTROLS CORPORATION

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5478048 Non-planar flexible graphite sealing ringsExpiredJun 10, 94Dec 26, 95[F16J]
5201532 Flexible non-planar graphite sealing ringExpiredDec 12, 91Apr 13, 93[F16J]
4596264 Flow control valveExpiredJul 26, 84Jun 24, 86[G05D]
4590576 Control system for flow control valvesExpiredJul 26, 84May 20, 86[G06F]
D273944 ThermostatExpiredFeb 12, 82May 22, 84[]
4323112 No energy band temperature controlExpiredMar 06, 79Apr 06, 82[F25B, G05D]
4312226 ComparatorExpiredNov 30, 79Jan 26, 82[G01K, G01L]
4252270 ThermostatExpiredJun 26, 78Feb 24, 81[G05D, F25B]
4243173 Pneumatic optimizerExpiredApr 30, 79Jan 06, 81[F23N]
4231512 ThermostatExpiredJun 26, 78Nov 04, 80[G05D]

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