Process for the production of molded polyurethane foams and the molded foams obtained by this process
CA 2003106 C · Owner: Kopp, Richard · Inventors: Kopp, Richard; Ganster, Otto; Neuhaus, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for the production of molded polyurethane foams having a compact surface and a density of at least 250 kg/m3 by the in-mold foaming of a reaction mixture containing, a) a polyisocyanate component containing at least one aromatic polyisocyanate, b) an isocyanate-reactive component containing at least one organic compound having at least two isocyanate-reactive groups and, c) a blowing agent, at an isocyanate index of 75 to 1500 characterized in that, organic carboxylic acids are used as blowing agents c) optionally in addition to other chemical or physical blowing agents. The present invention is also directed to the molded polyurethane foams …
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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 November 16, 1989 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 16, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 16, 2011.
- 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.