TURNMASTER CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4,790,233 Method and apparatus for controlling hydraulic systemsExpiredJul 08, 87Dec 13, 88[F15B]
4,789,001 Operating system for a valveExpiredOct 07, 86Dec 06, 88[F16K]
4,752,867 Control circuitry for electric drivesExpiredSep 04, 85Jun 21, 88[G05B, G06F]
4,706,456 Method and apparatus for controlling hydraulic systemsExpiredSep 04, 84Nov 17, 87[G05B, F16D]
4,658,859 Valve spool with cross drill portsExpiredDec 07, 84Apr 21, 87[F16K]
4,218,942 Inch/metric thread dialExpiredMay 09, 79Aug 26, 80[B23B]

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