Production of cellular plastics by the polyisocyanate polyaddition process, and low-boiling, fluorinated or perfluorinated, tertiary alkylamines as blowing agent-containing emulsions for this purpose
CA 2070157 A1 · Owner: Volkert, Otto · Inventors: Volkert, Otto; Maurer, Walter; Volkert, Otto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/42472, Abstract of the Disclosure: A process for the production of cellular plastics by the polyisocyanate polyaddition process, by reacting, a) an organic and/or modified organic polyisocyanate with, b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, c) a low-molecular-weight chain extender and/or crosslinking agent, in the presence of, d) a blowing agent e) a catalyst and, f) assistants and/or additives wherein the blowing agent (d) used, d1) a low-boiling fluorinated or perfluorinated, tertiary alkylamine or, a mixture of (d1) and at least one physical or chemical blowing agent (d2) which is different from …
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 June 1, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 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.