Process for preparing carboxylic acids or corresponding esters using an iridium-based catalyst
CA 2120287 C · Owner: Perron, Robert · Inventors: Nobel, Dominique; Denis, Philippe; Perron, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns the preparation of carboxylic acids or corresponding esters by the reaction of an alcohol with carbon monoxide using an iridium-based catalyst and a halogenated promoter. The reaction is carried out with a reaction mixture whose composition is maintained during the operation. The said mixture includes between 0 (excluded) and 10% water between 0 (excluded) and 10% of halogenated promoter between 2 and 40% of ester corresponding to the pre-cited reaction of alcohol and carboxylic acid the said carboxylic acid forming the reaction solvent.
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 March 30, 1994 and granted October 24, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2016.
- 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.