Baker Oil Tools, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4921045 Slip retention mechanism for subterranean well packerExpiredDec 06, 85May 01, 90[E21B]
4880056 Hydraulically activated firing head for well perforating gunsExpiredJul 11, 88Nov 14, 89[E21B]
4862967 Method of employing a coated elastomeric packing elementExpiredJul 18, 88Sep 05, 89[E21B, F16J]
4838349 Apparatus for testing selected zones of a subterranean boreExpiredNov 16, 87Jun 13, 89[E21B]
4836278 Apparatus for isolating a plurality of vertically spaced perforations in a well conduitExpiredFeb 04, 88Jun 06, 89[E21B]
4817718 Hydraulically activated firing head for well perforating gunsExpiredSep 08, 87Apr 04, 89[E21B]
4796705 Subsurface well safety valveExpiredAug 26, 87Jan 10, 89[E21B]
4789029 Tension set packing apparatus for subterranean wellsExpiredNov 02, 87Dec 06, 88[E21B]
4778008 Selectively releasable and reengagable expansion joint for subterranean well tubing stringsExpiredMar 05, 87Oct 18, 88[F16L, E21B]
4754812 Dual string packer method and apparatusExpiredMar 23, 87Jul 05, 88[E21B]
4755230 Method of and composition for removing paraffin deposits from hydrocarbon transmission conduitsExpiredApr 10, 87Jul 05, 88[C23G]
4747201 Boosterless perforating gunExpiredOct 03, 86May 31, 88[B23P]
4743033 Dynamic seal assembly for piston and cylinder operating in subterranean wellsExpiredDec 16, 85May 10, 88[F16J]
4735266 Method and apparatus for isolating a plurality of vertically spaced perforations in a well conduitExpiredOct 23, 86Apr 05, 88[E21B]
4732214 Subsea production test valve assemblyExpiredJan 12, 87Mar 22, 88[E21B]
4730670 High temperature packer for well conduitsExpiredJun 22, 87Mar 15, 88[E21B]
4730835 Anti-extrusion seal elementExpiredSep 29, 86Mar 15, 88[E21B, F16J]
4722400 Mechanically actuated subsurface injection toolExpiredMay 12, 86Feb 02, 88[E21B]
4721157 Fluid sampling apparatusExpiredMay 12, 86Jan 26, 88[E21B]
4709758 High temperature packer for well conduitsExpiredDec 06, 85Dec 01, 87[E21B]

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