Chain polyene group-containing norbornene compound and unsaturated ethylene copolymer using the same
CA 2208689 C · Owner: Kihara, Noriaki · Inventors: Tsutsui, Toshiyuki; Ishida, Tatsuyoshi; Onishi, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The chain polyene-group containing norbornene compound of the invention is represented by the formula I: ... I, wherein n is an integer of 1 to 5 R1 is an alkyl group of, 1 to 5 carbon atoms and R2 and R3 are each independently a hydrogen atom or an alkyl group of 1 to 5 carbon atoms. The unsaturated ethylene copolymer of the invention is a random copolymer of 30 to 92 % by mol of (i) ethylene units, 6 to 70 % by mol of (ii) specific .alpha.-olefin units and 0.1 to 30 % by mol of (iii) units derived from the norbornene compound I, where the molar ratio of (i)/(ii) is in the range of 40/60 to 92/8 and the unit (iii) is represented by the specific formula, and has an intrinsic viscosity .pi. …
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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 December 25, 1995 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 25, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 25, 2017.
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