Canada-Cities Service, Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4489828 Device for splicing cable endsExpiredApr 05, 82Dec 25, 84[B65G]
4474616 Blending tar sands to provide feedstocks for hot water processExpiredDec 13, 83Oct 02, 84[C10G]
4462892 Control of process aid used in hot water process for extraction of bitumen from tar sandExpiredMar 17, 83Jul 31, 84[C10G]
4456536 Skimmer apparatus for recovering bitumenExpiredJul 10, 81Jun 26, 84[E02B]
4383914 Dilution centrifuging of bitumen froth from the hot water process for tar sandExpiredMay 18, 81May 17, 83[C10G]
4372174 Method and apparatus for sampling a core of tar sandExpiredMay 04, 81Feb 08, 83[G01N]
4328710 Homogenizer/subsampler for tar sand process streamsExpiredApr 02, 81May 11, 82[G01N]
4284360 Homogenizer/subsampler for tar sand process streamsExpiredNov 05, 79Aug 18, 81[B01F]
4282103 Method for controlling flocculant addition to tar sand tailingsExpiredNov 20, 79Aug 04, 81[C02F, B01D]
4225422 Beneficiation of heavy minerals from bituminous sands residues by dry screeningExpiredSep 17, 79Sep 30, 80[B07B]
4225433 Filtration of hot water extraction process whole tailingsExpiredOct 02, 78Sep 30, 80[C02F, B01D]
4201656 Process aid addition in hot water process based on feed fines contentExpiredFeb 21, 79May 06, 80[C10G]
4197937 Non-ionic emulsifying release agent for bituminous sands conveyor beltExpiredNov 01, 77Apr 15, 80[B65G]

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