Flame and smoke reduced high density polyurethane foams
CA 2046235 A1 · Owner: Miller, John W. · Inventors: Miller, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, This invention relates to rigid polyurethane foams having densities from about 13 lb/ft3 to about 30 lb/ft3 which exhibit reduced flammability and smoke generating characteristics. This is accomplished by reacting an aromatic isocyanate with a polyhydroxy containing compound a blowing agent, optional additives, and incorporating a combination of melamine and urea into the unreacted polyhydroxy containing resin. -18-
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 July 4, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2013.
- 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.