DELTA-X CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4509552 Gas gun for determining the liquid level of a wellExpiredApr 18, 83Apr 09, 85[F16K, G01L]
4320157 Method for preserving large sections of biological tissue with polymersExpiredAug 08, 80Mar 16, 82[B29D, A47G]
4307395 Method of and apparatus for recording, storing and replaying dynamometer data from a liquid well pumpExpiredApr 03, 80Dec 22, 81[H04Q, G08C, G06F, G11B]
4302157 High fluid level pump off controller and processExpiredFeb 05, 79Nov 24, 81[F04B]
4286925 Control circuit for shutting off the electrical power to a liquid well pumpExpiredOct 31, 79Sep 01, 81[F04B]
4268228 Hydraulic pumping unitExpiredAug 13, 79May 19, 81[F04B]

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