TRI-STATE OIL TOOLS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5234056 Sonic method and apparatus for freeing a stuck drill stringExpiredAug 10, 90Aug 10, 93[E21B]
5030034 Soil pollution monitoring system and apparatusExpiredJan 19, 89Jul 09, 91[E02D]
4913234 Fluid driven screw type sonic oscillator-amplifier system for use in freeing a stuck pipeExpiredJan 19, 89Apr 03, 90[E21B]
4836299 Sonic method and apparatus for installing monitor wells for the surveillance and control of earth contaminationExpiredOct 19, 87Jun 06, 89[E21B]
4824258 Fluid driven screw type (moyno) sonic oscillator systemExpiredJul 27, 87Apr 25, 89[F03C, F01C, B01F]
4673037 Method for sonically loosening oil well liner environmentsExpiredOct 03, 85Jun 16, 87[E21B]
4667742 Down hole excitation system for loosening drill pipe stuck in a wellExpiredJan 31, 86May 26, 87[E21B]
4665980 Method for improving well production by sonically driving granular medium installed in wellExpiredMar 24, 86May 19, 87[E21B]
4662459 Drilling system and method employing torsional sonic vibration for lubrication of journal type bit bearingsExpiredMar 08, 85May 05, 87[E21B]
4522271 Method and apparatus for damping vibrations in drill collar stringsExpiredOct 17, 83Jun 11, 85[E21B]
4521688 Three-dimensional and tomographic imaging device for x-ray and gamma-ray emitting objectsExpiredJan 21, 83Jun 04, 85[G01T]
4512401 Method for forming a cement annulus for a wellExpiredMay 27, 82Apr 23, 85[E21B]
4429743 Well servicing system employing sonic energy transmitted down the pipe stringExpiredFeb 01, 82Feb 07, 84[E21B]
4354559 Enlarged borehole drilling method and apparatusExpiredJul 30, 80Oct 19, 82[E21B]
4354560 Apparatus for drilling enlarged boreholesExpiredOct 26, 81Oct 19, 82[E21B]
4299279 Apparatus for sonically extracting oil well linersExpiredJan 31, 80Nov 10, 81[E21B]
4244431 Drilling apparatus with dual drill pipe and cross-overExpiredJan 18, 79Jan 13, 81[E21B]
4243252 Dual concentric pipe jointExpiredJan 18, 79Jan 06, 81[F16L]
4236580 Method and apparatus for sonically extracting oil well linersExpiredApr 04, 78Dec 02, 80[E21B]
4219087 Enlarged bore hole drilling methodExpiredJan 18, 79Aug 26, 80[E21C]

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