Expired Canadian patentCanada
Isomerization of carboxylic acids
CA 2004960 C · Owner: Burke, Patrick M. · Inventors: Burke, Patrick M.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Isomerization of branched saturated alkyl carboxylic acids to linear or isomeric branched alkyl carboxylic acids, or vice versa, by heating in the presence of a iodide or bromide promoted rhodium catalyst and carbon monoxide.
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 December 8, 1989 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 8, 1989
GrantedSeptember 21, 1999
Term endedDecember 8, 2009
Patent numberCA 2004960 C
Classification (IPC)C07C51/35 +2 more
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.