Process for preparing rigid and flexible polyurethane foams
CA 2268179 A1 · Owner: Huntsman Ici Chemicals Llc · Inventors: Eling, Berend
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for preparing a rigid and a flexible polyurethane foam by reacting a polyisocyanate and two different polyols under foam forming conditions the , polyisocyanate being reacted with said polyols in the absence of compounds comprising primary, secondary or tertiary amines. Flexible foams are obtained which do not show a major glass transition temperature between -100 ~C and +25 ~C.
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 October 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2019.
- 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.