Polyisocyanate mixtures containing isocyanurate groups, a process for their production and their use for the production of polyurethane foams
CA 2049515 A1 · Owner: Welte, Rainer · Inventors: Welte, Rainer; Gleitsmann, Gunter; Scholl, Hans Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo3604, LeA 27,848, NEW POLYISOCYANATE MIXTURES CONTAINING ISOCYANURATE GROUPS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE FOR THE, PRODUCTION OF POLYURETHANE FOAMS ABSTRACT OF THE DISCLOSURE, Disclosed herein are liquid polyisocyanate mixtures containing isocyanurate groups and having an NCO content of 15 to 30% by weight obtainable by partial trimerization of the isocyanate groups of polyisocyanate mixtures of the diphenyl methane series containing 80 to 100% by weight diisocyanatodiphenyl methane isomers and O to 20% by weight higher than difunctional polyisocyanates of the diphenyl methane series, 40 to 80% by weight of the diisocyanatodiphenyl methane isomers consisting of …
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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 August 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 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
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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.