Baker International Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4998706 Vane core assembly for use in making centrifugal elastomer coated impellersExpiredMar 21, 88Mar 12, 91[B29C]
4793470 Conveyor belt cradle assemblyExpiredJul 14, 86Dec 27, 88[B65G]
4752732 Angular displacement sensorExpiredMar 14, 85Jun 21, 88[G01B]
4750573 Drill bit having a flush-out portExpiredDec 04, 85Jun 14, 88[E21B]
4751002 Cable supported rake arm thickenerExpiredJan 29, 87Jun 14, 88[B01D]
4749053 Drill bit having a thrust bearing heat sinkExpiredFeb 24, 86Jun 07, 88[E21B]
4744699 Single-pass roof bolt and apparatus and method for installationExpiredMay 19, 86May 17, 88[E21D]
4737272 Froth flotation method and apparatusExpiredApr 11, 86Apr 12, 88[B03D, B03B]
4540051 One trip perforating and gravel pack systemExpiredJan 17, 85Sep 10, 85[E21B]
4488596 Locking apparatus for use in a subterranean wellExpiredOct 26, 83Dec 18, 84[E21B]
4478288 Apparatus with annulus safety valve for through tubing injection and method of useExpiredOct 02, 81Oct 23, 84[E21B]
4476944 Method of providing a fluid seal in downhole drilling apparatusExpiredMar 20, 81Oct 16, 84[E21B]
4475599 Valve for subterranean wellsExpiredMay 01, 81Oct 09, 84[E21B]
4462472 Marine bearing for a downhole drilling apparatusExpiredMay 29, 81Jul 31, 84[E21B]
4460048 Pump through equalizing check valve for use in intermittent gas lift wellExpiredApr 27, 81Jul 17, 84[E21B]
4458751 Method and apparatus for selective disengagement of a fluid transmission conduit operable under oppositely directed pressure differentialsExpiredMay 21, 81Jul 10, 84[E21B]
4456061 Filters used in well fluid cleaning operationsExpiredAug 31, 81Jun 26, 84[E21B, B01D]
4452583 Liquid hydrocarbon burning method and apparatusExpiredJan 22, 81Jun 05, 84[F23D]
4446745 Apparatus for counting turns when making threaded joints including an increased resolution turns counterExpiredApr 10, 81May 08, 84[G01L]
4445572 Unrestricted bore safety jointExpiredAug 17, 81May 01, 84[E21B]

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