DAVY MCKEE CORPORATION, A DE CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4906130 Anti-scouring device for a dam stilling basin or approachExpiredJul 26, 88Mar 06, 90[E02B]
4881848 Method of forming an immersed dam foundation and a dam structure thereonExpiredJul 26, 88Nov 21, 89[E02B]
4865820 Gas mixer and distributor for reactorExpiredAug 14, 87Sep 12, 89[B01J]
4689007 Process of thermally treating lump or agglomerated materials on a travelling grateExpiredSep 04, 85Aug 25, 87[C22B, F27B]
4683029 Circular solvent extractorExpiredSep 20, 85Jul 28, 87[B01D]
4603225 Process for separating dimethyl ether from a hydrocarbon mixture containing the sameExpiredSep 11, 85Jul 29, 86[C07C]
4575055 Circular traveling grate machineExpiredJul 15, 85Mar 11, 86[F27B]
4572484 Pallet construction for traveling grate machinesExpiredJul 15, 85Feb 25, 86[F27B]
4563273 Process and apparatus for separating fines from micella streamsExpiredMar 27, 81Jan 07, 86[B01D]
4503018 Desulfurization of phosphogypsumExpiredFeb 14, 83Mar 05, 85[C01B, C01F]
4448667 Process for solvent extraction of bitumen from oil sandExpiredDec 20, 82May 15, 84[C10G]
4436611 Process for heating recycle gas in oil shale retortingExpiredJul 01, 83Mar 13, 84[C10G, C10B]
4427371 Pusher furnace with soak zone lifterExpiredJan 20, 82Jan 24, 84[F27B, F27D]
4425220 Method of and apparatus for processing of oil shaleExpiredFeb 08, 82Jan 10, 84[C10B]
4422901 Apparatus for the continuous solvent extraction of bitumen from oil-bearing sandExpiredSep 30, 82Dec 27, 83[C10C, B01D]
4412976 Adjustable wheel assembly in a rotary solvent extractorExpiredSep 08, 81Nov 01, 83[B01D]
4402923 Process for making phosphoric acidExpiredSep 02, 81Sep 06, 83[C01B]
4393027 Process for erecting a rotor assembly for a rotary extractor and apparatus thereforExpiredSep 08, 81Jul 12, 83[B01D]
4389243 Method for the flash oxidation of metal concentratesExpiredOct 17, 80Jun 21, 83[C22B]
4376052 Fluid manifold assembly for solvent extractorExpiredFeb 23, 81Mar 08, 83[B01D]

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