Process for preparing 3-trifluoromethyl benzyl chloride
CA 2089271 C · Owner: Chevron Research And Technology Company · Inventors: Schinski, William L.; Denisevich, Peter Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for forming (3-trifluoromethyl-phenyl)acetonitrile through the intermediate .alpha. .alpha.. .alpha.-trifluoro-.alpha. -chloro-m-xylene. This intermediate is formed by selective chlorination of .alpha. .alpha. .alpha.-trichloro-m-xylene under conditions which maximize yield and minimize the formation of undesired non-recyclable chlorinated , by-products.
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 October 26, 1990 and granted December 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2012.
- 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.