Polyurethaneurea elastomer
CA 2099197 C · Owner: Oyaizu, Yoshijiro · Inventors: Kato, Kaneyoshi; Oyaizu, Yoshijiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyurethaneurea elastomer obtained by reacting a polyisocyanate component obtained by reacting 1,5- naphthalene diisocyanate with a polyol with an amine component consisting essentially of an amine compound of the formula (1): (See Formula I) wherein R is a bivalent polyalkylene polyether or polyalkylene polyester having an average molecular weight of at least 200 which may contain unsaturated bonds in the polyalkylene.
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 June 25, 1993 and granted August 19, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2015.
- 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.