Preparation of urethane products
CA 2044809 A1 · Owner: Mcghee, William D. · Inventors: Mcghee, William D.; Riley, Dennis P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for preparing urethanes from primary or secondary amines carbon dioxide and a diolefin. The amine is reacted with carbon dioxide to form the ammonium carbamate salt which is then reacted with a stoichiometric amount of a diolefin coordinated to palladium(II).
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 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 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.