Esso Resources Canada Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5876592 Solvent process for bitumen separation from oil sands frothExpiredMay 18, 95Mar 02, 99[C10G]
5494150 Conveyor belt system with shock-absorbing belt side travel control meansExpiredJun 21, 94Feb 27, 96[B65G]
5492628 Process for reducing sludge accumulation in the hot water extraction process for oil sandsExpiredOct 06, 94Feb 20, 96[C02F]
5460270 Oil sand extraction process with in-line middlings aeration and recycleExpiredSep 01, 93Oct 24, 95[C10G]
5376276 In situ primary froth quality measurements using microwave monitorExpiredApr 01, 93Dec 27, 94[C10G, B01D]
5290433 Froth washerExpiredAug 22, 91Mar 01, 94[C10G]
5264118 Pipeline conditioning process for mined oil-sandExpiredDec 26, 91Nov 23, 93[C10G]
5242580 Recovery of hydrocarbons from hydrocarbon contaminated sludgeExpiredMar 02, 92Sep 07, 93[B09B, C10G, B01D]
5197783 Extendable/erectable arm assembly and method of borehole miningExpiredApr 29, 91Mar 30, 93[E21B, E21C]
5118408 Reducing the water and solids contents of bitumen froth moving through the launder of a spontaneous flotation vesselExpiredSep 06, 91Jun 02, 92[B03D, C10G]
5039227 Mixer circuit for oil sandExpiredNov 24, 89Aug 13, 91[B01F]
5009773 Monitoring surfactant content to control hot water process for tar sandExpiredJan 07, 87Apr 23, 91[C10E]
4946227 Bucket wheel assemblyExpiredMay 22, 89Aug 07, 90[F21C]
4946597 Low temperature bitumen recovery processExpiredMar 24, 89Aug 07, 90[C02F]
4907690 Device for removing a compacted oil sand layer from a conveyor beltExpiredAug 19, 88Mar 13, 90[B65G]
4863009 Control system for an endless belt conveyor trainExpiredNov 14, 88Sep 05, 89[G01G]
4859317 Purification process for bitumen frothExpiredFeb 01, 88Aug 22, 89[C10C]
4783268 Microbubble flotation process for the separation of bitumen from an oil sands slurryExpiredDec 28, 87Nov 08, 88[B03D, C10G]
4776949 Recycle of secondary froth in the hot water process for extracting bitumen from tar sandExpiredDec 05, 85Oct 11, 88[C10G]
4642223 Method for removing spent catalyst from a reactor tower and assembly for facilitating sameExpiredApr 02, 85Feb 10, 87[B01J]

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