Process for the preparation of a biphenyl derivative
CA 2093723 C · Owner: Boudin, Alain · Inventors: Bouisset, Michel; Boudin, Alain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The subject of the invention is a process for the preparation of 4-methyl-2'-cyanobiphenyl of formula: w h e r e i n a benzonitrile halide of general formula:, in which Hal represents a halogen atom is reacted, in, the presence of a manganese salt with an organometallic, derivative of general formula: in which X represents a halogen atom, and the complex obtained is then hydrolysed, which provides the desired compound.
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 April 8, 1993 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2015.
- 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.