Thermoformable polyurethanes
CA 2079168 A1 · Owner: Sarpeshkar, Ashok M. · Inventors: Sarpeshkar, Ashok M.; Markusch, Peter H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo3691-CIP, MD-90-32-PU-CIP, THERMOFORMABLE POLYURETHANES ABSTRACT OF THE DISCLOSURE, This invention relates to thermoformable polyurethanes prepared by the reaction of (a) aliphatic or cycloaliphatic polyisocyanates (b) 50 to 95 equivalent percent, relative to component (a) of, a polyester, polycarbonate, and/or polyester carbonate diol having a molecular weight of from 2000 to 5000 (c) 5 to 50 equivalent percent, relative to component (a) of, one or more diols having an average molecular weight of from 90 to 530, (d) optionally, a catalyst and, (e) optionally, inorganic fillers wherein the ratio of isocyanate groups to hydroxyl groups is from 0.8:1 to 1.5:1. Mo3691CIP
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 September 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2014.
- 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.