Self skinning foams employing tertiary alcohols as blowing agents
CA 2234440 A1 · Owner: Basf Corporation · Inventors: Brown, Bari W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention pertains to low weight, relatively low density semi-rigid and rigid self skinning polyurethane foams having improved surface hardness and reduced porosity over known water blown foams. The polyurethane foam includes an isocyanate component and an isocyanate reactive component including a blowing agent comprising water and at least one tertiary alcohol.
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 May 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2020.
- 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.