Hydrophobic light stable polyurethane elastomer with improved mechanical properties
CA 2395883 A1 · Owner: Bayer Corporation · Inventors: Haider, Karl W.; Taylor, Ronald P.; Franz, Uli W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydrophobic polyurethane elastomer is disclosed comprising an isocyanate terminated prepolymer having an isocyanate content ranging from 4 to 12 wt.% NCO comprising the reaction product of: (i) an OH terminated homopolymer of butadiene having molecular weight ranging from 1000 to 4000 and an OH functionality of from 1.9 to 2.1; (ii) an aliphatic or cycloaliphatic diisocyanate; and a diol chain extender having a molecular weight ranging from 62 to 400.
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 December 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2022.
- 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.