SPERRY-SUN WELL SURVEYING COMPANY

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4505155 Borehole pressure measuring systemExpiredOct 11, 83Mar 19, 85[E21B]
4484785 Tubing protectorExpiredAug 16, 82Nov 27, 84[F16C, E21B]
4338969 Through fault pressure filter for fault pressure relayExpiredDec 09, 77Jul 13, 82[F16D]
4298970 Borehole acoustic telemetry system synchronous detectorExpiredAug 10, 79Nov 03, 81[H04B, G01V]
4293936 Telemetry systemExpiredDec 13, 78Oct 06, 81[G01V]
4293937 Borehole acoustic telemetry systemExpiredAug 10, 79Oct 06, 81[G01V]
4254481 Borehole telemetry system automatic gain controlExpiredAug 10, 79Mar 03, 81[G01V]
4200297 Side entry clamp and packoffExpiredSep 13, 76Apr 29, 80[F16J]

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