Cities Service Oil and Gas Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5082058 Composition and method for slowly dissolving siliceous materialExpiredFeb 22, 88Jan 21, 92[E21B]
4939203 Gel for retarding water flowExpiredAug 01, 88Jul 03, 90[C08L]
4863572 Corrosion probe and method for measuring corrosion ratesExpiredApr 18, 88Sep 05, 89[G01N]
4840719 Corrosion probe and method for measuring corrosion ratesExpiredSep 06, 88Jun 20, 89[G01N]
4796700 Process for retarding fluid flowExpiredJan 24, 86Jan 10, 89[C08J, E21B]
4784729 Electrochemical analysis method using corrosion probeExpiredFeb 01, 88Nov 15, 88[G01N]
4752360 Corrosion probe and method for measuring corrosion ratesExpiredAug 29, 86Jun 21, 88[G01N]
4738770 Apparatus and method of removal of catalyst blockage from reactor recycle pumpsExpiredNov 25, 85Apr 19, 88[F27B, C10G]
4685191 Apparatus and process for selectively expanding to join one tube into another tubeExpiredMay 12, 86Aug 11, 87[B23P, B21D]
4673038 Gel and process for preventing carbon dioxide break throughExpiredJan 24, 86Jun 16, 87[E21B]
4665986 Gel and method for reducing steam channelingExpiredJan 24, 86May 19, 87[E21B]
4665987 Prepartially crosslinked gel for retarding fluid flowExpiredJan 24, 86May 19, 87[E21B]
4666957 Gel for retarding water flowExpiredOct 18, 84May 19, 87[C09K]
4664194 Gel for retarding water flowExpiredJan 22, 85May 12, 87[E21B]
4643255 Gel and process for preventing loss of circulation, and combination process for enhanced recoveryExpiredDec 18, 85Feb 17, 87[E21B]
4576708 Beneficiation of shale kerogen and its conversion into shale oilExpiredAug 06, 84Mar 18, 86[C10G]
4498540 Gel for retarding water flowExpiredJul 18, 83Feb 12, 85[E21B]

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