Mix of silicon-polyether copolymer surfactants as pu foam cell openers
CA 2061013 C · Owner: Ck Witco Corporation · Inventors: Reedy, James Dale; Cobb, Raymond Lynn; Farris, David Dwight
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compositions including silicone surfactants of the type used in manufacturing urethane foams and certain siloxane-oxyalkylene copolymers which act as cell openers when employed in combination with silicone surfactants in urethane foam manufacture are disclosed and claimed, as are urethane foam compositions including such cell openers a method, of preparing urethane foams using such cell operers. and urethane foams prepared by the method.
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 February 11, 1992 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 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.