Method for making triarylsulfonium hexafluorometal or metalloid salts
CA 2034400 A1 · Owner: Lee, Julia Lam · Inventors: Crivello, James Vincent; Lee, Julia Lam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
RD-19,709, METHOD FOR MAKING TRIARYLSULFONIUM HEXAFLUORO METAL OR METALLOID SALTS, Abstract of the Disclosure A method for making a triarylsulfonium hexafluoro metal or metalloid salt is provided by effecting reaction between a diarylsulfoxide and an aromatic substrate such as, an arylalkylether in the presence of a solution of phosphorus pentoxide and methanesulfonic acid to produce a triarylsulfonium complex. A metathesis of the resulting triarylsulfonium complex is effected with an alkali metal hexafluoro metal or metalloid salt.
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 January 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 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.