Process for the preparation of 2-alkyl-4-acyl-6-tert- butylphenol compounds
CA 2106786 C · Owner: Echler, Richard S. · Inventors: Echler, Richard S.; Gibson, Thomas W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The subject invention relates to a process for the preparation of 2-alkyl-4-acyl-6-tert-butylphenol compound having chemical structure (1), wherein -R is an aliphatic group having a terminally unsaturated moiety selected from -C~CH and -CH=C=CH2, and R' is selected from saturated straight branched or cyclic alkyl having from 1 to about 10 carbon atoms; the 2-alkyl-4-acyl-6-tert-butylphenol compound being produced in a reaction mixture comprising the corresponding 2-alkyl- 6-tert-butylphenol (2), the corresponding carboxylic acid: RCOOH and trifluoroacetic anhydride.
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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
- Filed January 31, 1992 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2014.
- 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.