Polyol components for the production of polyurethane mouldings
CA 2067846 C · Owner: Novartis Ag · Inventors: Spitzer, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to polyol compositions in, particular for reaction with polyisocyanates of the diphenylmethane series, which comprise a) a polyol having a hydroxyl equivalent weight of up to 150 and a functionality of 4 to 8, b) a polyether-polyol having a hydroxyl equivalent weight of more than 1900 and a functionality of 2 to 4 and c) a polypropylene glycol having a functionality of 2 to 3, a polytetrahydrofuran, each of which has a hydroxyl equivalent weight of 150 to 500, or a mixture of the two. The polyol compositions are distinguished by a low tendency to demix, even during prolonged storage. Reaction mixtures of the polyol compositions described and polyisocyanates of the …
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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 May 1, 1992 and granted July 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2014.
- 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.