Method for preparing (poly)isocyanate composition with reduced viscosity
CA 2301071 A1 · Owner: Randu, Stephane · Inventors: Carlo, Michel; Bernard, Jean-Marie; Charriere, Eugenie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for preparing a (poly)isocyanate composition with reduced viscosity comprising at least a dimeric isocyanate with uretidine-dione unit from initial monomeric isocyanates characterised in that the initial reaction medium is heated in the absence of a dimerization catalyst to a temperature of not less than 50 ·C and not more than 200 ·C for a duration of not more than 24 hours.
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 August 12, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2020.
- 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.