Hydra-Rig Incorporated

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4585061 Apparatus for inserting and withdrawing coiled tubing with respect to a wellExpiredOct 18, 83Apr 29, 86[E21B]
4494415 Liquid nitrogen pumpExpiredMar 25, 82Jan 22, 85[F04B, F01B, F16H]
4436177 Truck operator's cab with equipment control stationExpiredMar 19, 82Mar 13, 84[B62D]
4417846 Traveling block elevator latch assemblyExpiredDec 09, 77Nov 29, 83[E21B]
4390315 Fire fighting boom assembly for service vesselExpiredDec 08, 80Jun 28, 83[B66C]
4324194 Stabilized hoist rig for deep ocean mining vesselExpiredMay 21, 79Apr 13, 82[B63B]
4290495 Portable workover rig with extendable mast substructure, platform mounted drawworks and adjustable wellhead anchorExpiredJun 18, 79Sep 22, 81[E21B]
4285629 Fire fighting boom assembly for service vesselExpiredMay 18, 78Aug 25, 81[B66C]
4257456 Pressure compensated spool valveExpiredOct 29, 79Mar 24, 81[F15B]
4200054 Stabilized hoist rig for deep ocean mining vesselExpiredDec 10, 76Apr 29, 80[B63B]

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