Method for the preparation of a phenol
CA 2032441 A1 · Owner: Frijns, Leon H.B. · Inventors: Offermanns, Matthias R.J.; Buijs, Wim; Frijns, Leon H.B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the preparation of a phenol by an oxidative decarboxylation in the liquid phase of the corresponding aryl carboxylic acid in the presence of a dissolved Cu-containing catalyst the, phenol being obtained through a hydrolysis step. The characteristic part of the method comprises the following process steps:, a) catalyst oxidation at 120-190 °C; b) a reduction and hydrolysis step at 225-270 °C;
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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 December 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 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.