BAKER HUGHES PRODUCTION TOOLS, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4940391 Compressor surge detection systemExpiredNov 07, 88Jul 10, 90[F04B]
4885098 Sonic method for facilitating the removal of solid particles from a slurryExpiredOct 21, 88Dec 05, 89[B01D]
4883532 Sonic method for facilitating the extraction of minerals from ore in a leachantExpiredJul 22, 88Nov 28, 89[C22B]
4848486 Method and apparatus for transversely boring the earthen formation surrounding a well to increase the yield thereofExpiredJun 19, 87Jul 18, 89[E21B]
4830758 Sonic method and apparatus for winning minerals from liquid carriersExpiredDec 03, 86May 16, 89[C25C, B01D]
4817712 Rod string sonic stimulator and method for facilitating the flow from petroleum wellsExpiredMar 24, 88Apr 04, 89[F04F, E21B]
4791899 Acoustic detonation suppression in internal combustion engineExpiredJan 23, 87Dec 20, 88[F02F]
4780138 Sonic apparatus and method for facilitating the extraction of minerals from ore in a leachantExpiredDec 03, 87Oct 25, 88[C22B]
4778279 Sonic agitator with multi phased vibration barsExpiredAug 20, 87Oct 18, 88[B01F]
4702315 Method and apparatus for sonically stimulating oil wells to increase the production thereofExpiredAug 26, 86Oct 27, 87[E21B]
4694855 Drill pipe inside blowout preventerExpiredMay 23, 86Sep 22, 87[F16K]
4695231 Sonic impeller for sonic well pumpExpiredOct 15, 85Sep 22, 87[F04F, B01F]
4693325 Sonic drill employing orbiting crank mechanismExpiredApr 07, 86Sep 15, 87[E21B]
4693326 Cycloidal earth cutting system with rocker-type nutating actionExpiredMay 20, 85Sep 15, 87[F21B]
4652309 Sonic method and apparatus for heap leachingExpiredJun 16, 86Mar 24, 87[C22B]
4641776 Segmented concentric centralizerExpiredAug 15, 85Feb 10, 87[B23K, B21D]
4629135 Cycloidal sonic mill for comminuting material suspended in liquid and powdered materialExpiredJan 26, 81Dec 16, 86[B02C]
4615400 Sonic drilling system employing spherical drill bitExpiredApr 22, 85Oct 07, 86[E21B]
4566800 Sonic device for extracting minerals from oreExpiredJan 13, 84Jan 28, 86[B06B, B01F]
4559911 Modification of diesel engine precombustion chamber to attenuate detonation and improve combustionExpiredMay 16, 80Dec 24, 85[F02B]

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