Expired Canadian patentCanada
Process for the production of 3, 3-dimethylglutaric acid or its esters
CA 1190561 A · Owner: Lonza Ltd. · Inventors: Lehky, Pavel
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the production of 3,3-dimethylglutaric acid or its esters from dimedone. Dimedone is converted with ozone into an ozone-addition product. The latter is converted by hydrolysis into 3,3-dimethylglutaric acid or by alcoholysis into one of its esters.
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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
- Granted July 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 26, 1982
GrantedJuly 16, 1985
Term endedJuly 16, 2002
Patent numberCA 1190561 A
Classification (IPC)C07C55/02 +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.