GULF CANADA RESOURCES LIMITED/RESSOURCES GULF CANADA LIMITEE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5033230 Method for passivating particulate coalExpiredFeb 29, 88Jul 23, 91[C10L]
4828688 Method for separation of heterogeneous phasesExpiredMay 06, 87May 09, 89[C10G]
4812225 Method and apparatus for treatment of oil contaminated sludgeExpiredFeb 10, 87Mar 14, 89[C10G]
4664206 Stabilizer for drillstemsExpiredSep 23, 85May 12, 87[E21B]
4640762 Process for improving the yield of distillables in hydrogen donor diluent crackingExpiredJul 08, 85Feb 03, 87[C10G]
4536374 Process using carbonate reagent for recovering vanadium from cokes and ashes derived from heavy oilsExpiredMay 08, 84Aug 20, 85[C01G]
4501326 In-situ recovery of viscous hydrocarbonaceous crude oilExpiredJan 17, 83Feb 26, 85[E21B]
4485004 Catalytic hydrocracking in the presence of hydrogen donorExpiredSep 07, 82Nov 27, 84[C10G]
4479742 Mobile bottom-founded caisson for arctic operationsExpiredFeb 03, 82Oct 30, 84[E02D]
4472360 Process using carbonate reagent for recovering vanadium from cokes and ashes derived from heavy oilsExpiredJul 25, 83Sep 18, 84[C01G]
4461624 Beneficiation of low-rank coals by immersion in residuumExpiredFeb 28, 83Jul 24, 84[C10L, F26B]
4437706 Hydraulic mining of tar sands with submerged jet erosionExpiredAug 03, 81Mar 20, 84[E21C]
4434741 Arctic barge drilling unitExpiredMar 22, 82Mar 06, 84[E02B, B63B]
4389378 Process using sulphate reagent for recovering vanadium from cokes derived from heavy oilsExpiredDec 24, 81Jun 21, 83[C01G]
4294686 Process for upgrading heavy hydrocarbonaceous oilsExpiredMar 11, 80Oct 13, 81[C10G]
4271007 Method and apparatus for the prevention of solids deposits in a tubular reactor by pulsed flowExpiredNov 23, 79Jun 02, 81[C10G]
4250151 Recovery of sulfur from gas streams containing sulfur and sulfur compounds in dilute concentrationExpiredSep 04, 79Feb 10, 81[C01B]

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