Ethylene/propylene copolymer rubbers
CA 2126792 C · Owner: Bai, Xinlai · Inventors: Zilker, Daniel Paul, Jr.; Nicoletti, James William; Lee, Kiu Hee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
20-, A process comprising contacting a mixture comprising ethylene, propylene, and, optionally, a diene in the gas phase, under, polymerization conditions with a catalyst system comprising:, (a) a catalyst precursor in independent or prepolymer form, consisting of vanadium (acetylacetonate)3; (b) optionally, a support for said precursor; (c) a cocatalyst consisting essentially of (i) an alkylaluminum halide having the formula AlR(3-a)Xa wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is independently chlorine, bromine, or iodine; and a is 1 or 2 and (ii), optionally, a trialkylaluminum provided that the molar ratio of alkylaluminum halide to trialkylaluminum is at …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 27, 1994 and granted August 25, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.