Fire retardant compositions
CA 2027256 C · Owner: Dueber, Ernst Otto · Inventors: Muller, Louis; Dueber, Ernst Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a fire retardant composition comprising a dispersion of a solid fire retardant such as melamine ammonium polyphosphate or guanidine carbonate in a liquid organic polyisocyanate which contains dispersed polymer particles. The preferred content of solid fire retardant is from 10 to 100 % by weight and the preferred content of polymer particles is from 2 to 30 % by weight. The compositions of the invention are suitable for the preparation of flexible and rigid polyurethane foams.
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 October 10, 1990 and granted January 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2012.
- 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.