Ontario Research Foundation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4999302 Biological contact gas scrubber for waste gas purificationExpiredMay 28, 85Mar 12, 91[C12S, C12M]
4752221 Orthodontic bracketExpiredOct 16, 84Jun 21, 88[A61C]
4725367 Buoyant filter mediaExpiredOct 06, 86Feb 16, 88[B01D]
4719063 Method of making implement handle for crippled personsExpiredNov 06, 85Jan 12, 88[C08G, B29C, B25G]
4670162 High thermal flux density wet oxidation steam generatorExpiredJan 21, 86Jun 02, 87[C02F]
4537628 Recovery of precious metalsExpiredDec 06, 83Aug 27, 85[C22B]
4521385 Recovery of titanium valuesExpiredFeb 28, 83Jun 04, 85[C01G]
4475972 Implantable materialExpiredApr 22, 82Oct 09, 84[A61F, B65H]
4259146 Method of heat treating chrysotile asbestos fibresExpiredJul 19, 79Mar 31, 81[D21B]
4256496 Production of metal carbides in pure formExpiredNov 09, 78Mar 17, 81[C04B]
4242759 M.C.P. Joint replacementExpiredMar 12, 79Jan 06, 81[A61F]
4206516 Surgical prosthetic device or implant having pure metal porous coatingExpiredDec 07, 77Jun 10, 80[A61F]
4192707 Heat treatment of chrysotile asbestos fibresExpiredDec 29, 77Mar 11, 80[D21B]

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