Cycloolefin polymer composition
CA 2114480 C · Owner: Sagane, Toshihiro · Inventors: Abe, Yoshiharu; Sagane, Toshihiro; Tsuji, Yoichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a cycloolefin copolymer composition comprising (A) 8 to 40% by weight of a cycloolefin elastomer component of an .alpha.-olefin, a specific cycloolefin and optionally a non-conjugated diene which contains a polymerizable carbon-carbon double bond; and (B) 92 to 60% by weight of a cycloolefin copolymer component which is obtained by copolymerizing an .alpha.-olefin and a specific cycloolefin in the presence of the elastomer component (A) wherein a, difference .DELTA.n D = ?n D(A) - n D(B)? between the refractive index n D(Aa) of the component Aa and the refractive index n D(Ba) of the component Ba is not more than 0.015. This composition has excellent properties inherent in a …
Read the whole patent
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 January 28, 1994 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 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.