IMPERIAL OIL LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4608486 Data entry systemExpiredMar 25, 85Aug 26, 86[G06K]
4558211 Transaction terminal systemExpiredMay 23, 83Dec 10, 85[G06K]
4553362 Prefabricated building unitsExpiredJan 17, 83Nov 19, 85[E04B, E04H]
4533778 Traction fluid lubricants derived from mineral oilExpiredDec 27, 82Aug 06, 85[C10M]
4532416 Transaction terminal with simplified data entryExpiredJan 03, 83Jul 30, 85[G06F]
4387256 Traction fluid lubricants derived from coal tarExpiredSep 02, 80Jun 07, 83[C07C]
4383914 Dilution centrifuging of bitumen froth from the hot water process for tar sandExpiredMay 18, 81May 17, 83[C10G]
4313228 Wireless link between vehicles and a stationary installationExpiredJan 23, 80Jan 26, 82[H04B]
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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