Thermoplastic polyurethane and a process for the preparation thereof
CA 2032968 A1 · Owner: The Dow Chemical Company · Inventors: Van Der Wal, Hanno H. R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for preparing a thermoplastic polyurethane resin and the resin prepared thereof. In particular, the invention relates to a thermoplastic polyurethane resin having, enhanced demold and physical properties which is, prepared from a polyol, a dihydroxyl chain-extending agent and organic diisocyanate in the presence of from 0.02 to 0.5 mole per mole of polyol of an amine compound containing at least two primary amine groups. 37,793-F
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 21, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2012.
- 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.