CANADIAN PATENTS AND DEVELOPMENT LIMITED/SOCIETE CANADIENNE DES BREVETS ET D'EXPLOITATION LIMITEE

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5047374 Surface strengthened composite ceramic materialExpiredApr 27, 88Sep 10, 91[C04B]
4998505 Salmonid egg incubatorExpiredSep 01, 89Mar 12, 91[A01K]
4990458 Derivatization of organic compounds during their analysis or determinationExpiredSep 22, 87Feb 05, 91[C07C, G01N]
4948211 Method and apparatus for optical imaging using a small, flat, reflecting surfaceExpiredFeb 02, 89Aug 14, 90[G02B, G03B]
4925574 Purification of hemoglobin and modified hemoglobin by affinity chromatographyExpiredMar 14, 86May 15, 90[B01D]
4895577 Low severity peat dewatering processExpiredNov 21, 88Jan 23, 90[C10F, E21C]
4869192 Semi-submersible drilling unit with cylindrical ring floatsExpiredSep 30, 87Sep 26, 89[B63B]
4848047 Spherical buildingsExpiredNov 10, 87Jul 18, 89[E04B, E04H]
4836039 Method and apparatus for introduction of a particulate sample for analysisExpiredSep 10, 87Jun 06, 89[G01N]
D300486 Foldable workstationExpiredJul 28, 86Apr 04, 89[]
4814084 Reverse osmosis membrane of cellulosic materialExpiredSep 01, 88Mar 21, 89[B01D]
4808074 Vertical axis wind turbinesExpiredApr 10, 87Feb 28, 89[F03D]
4787748 Synchronous optical scanning apparatusExpiredMay 06, 87Nov 29, 88[G01C, G01B]
4750798 Prism light guide luminaireExpiredJun 30, 86Jun 14, 88[G02B]
4735158 Planting machineExpiredApr 25, 86Apr 05, 88[A01C]
4735553 Straight peristaltic pump for conveying concrete or the likeExpiredApr 25, 86Apr 05, 88[F04B]
4732046 Method and apparatus for the introduction of a vaporizable sample into an analytical test apparatusExpiredMar 12, 87Mar 22, 88[G01N]
4728409 Perforated bipole electrochemical reactorExpiredDec 02, 85Mar 01, 88[C25B]
4689126 Method of converting a precursor ceramic solid into a solid ceramic hydronium conductorExpiredNov 21, 84Aug 25, 87[C25F]
4678132 Traction device for line handling equipmentExpiredNov 13, 86Jul 07, 87[B65H]

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