MASX ENERGY SERVICES GROUP, INC. (A DELAWARE 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Expired/Abandoned/Withdrawn Patents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
5082020 Valve body for oilfield applicationsExpiredDec 05, 90Jan 21, 92[F16K]
5074355 Section mill with multiple cutting bladesExpiredAug 10, 90Dec 24, 91[E21B]
5062450 Valve body for oilfield applicationsExpiredOct 05, 90Nov 05, 91[F16K]
5046557 Well packing toolExpiredApr 30, 90Sep 10, 91[E21B]
5035292 Whipstock starter mill with pressure drop tattletaleExpiredJan 11, 89Jul 30, 91[E21B]
5022472 Hydraulic clamp for rotary drilling headExpiredNov 14, 89Jun 11, 91[E21B]
4813486 Retractable slip assemblyExpiredSep 23, 87Mar 21, 89[E21B]
4784226 Drillable bridge plugExpiredMay 22, 87Nov 15, 88[E21B]
4640351 Sealing packerExpiredOct 02, 85Feb 03, 87[E21B]
4572290 Mechanical setting toolExpiredFeb 06, 84Feb 25, 86[E21B]
4530398 Retrievable well bore packerExpiredAug 02, 82Jul 23, 85[F21B]
4454913 Safety valve system with retrievable equalizing featureExpiredJan 05, 81Jun 19, 84[E21B]
4441519 Gas lift valve and method of presettingExpiredFeb 08, 82Apr 10, 84[F04F]

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