RICKERT PRECISIONS INDUSTRIES, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4377177 Throttling mud choke apparatusExpiredMay 08, 81Mar 22, 83[F16K, B08B]
4281678 Throttling mud choke apparatusExpiredApr 16, 79Aug 04, 81[F16K]
4257442 Choke for controlling the flow of drilling mudExpiredMar 08, 79Mar 24, 81[F16K]
4190073 Choke for controlling the flow of drilling mudExpiredSep 27, 76Feb 26, 80[F16K]

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