Production of rigid polyurethane foams
CA 2233366 A1 · Owner: Schmiade, Werner · Inventors: Schmiade, Werner; Naber, Bernhard; Gassan, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for producing rigid polyurethane foams by reacting a) polyisocyanates, b) compounds containing at least two hydrogen atoms capable of reacting with isocyanate groups, in the presence of c) catalysts, d) blowing agents and, if desired e) further auxiliaries and/or additives the component b) comprises at least one recycled polyol which is formed by glycolysis of polyurethanes.
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 April 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 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.