Process for the preparation of heat curable flexible molded polyurethane foams
CA 2026033 A1 · Owner: Brock, Martin · Inventors: Brock, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of heat curable flexible molded polyurethane foams comprising reacting in a closed mold (a) polyisocyanates of the diphenylmethane diisocyanate type containing no more than 80% by weight of monomeric diphenylmethane diisocyanate as the 4,4'-isomer, with (b) compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 400 to about 10,000, and optionally, (c) chain, lengthening and/or crosslinking agents containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 32 to 399, in the presence of (d) water as blowing agent.
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 24, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 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.