Catalysis using phosphine oxide and sulfoxide compounds
CA 2408329 C · Owner: Li, George Y. · Inventors: Li, George Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Phosphine oxide and sulfoxide compounds were used with transition metals preferably palladium and nickel, to produce biaryls arylthiols, arylphosphine , oxides and arylamines via cross-coupling reactions with aryl halides and arylboronic acids, aryl Grignard reagents thiols, phosphine oxides or amines.
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 26, 2001 and granted August 16, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2023.
- 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.