Process for preparing substituted phenols
CA 2176199 C · Owner: Meilland, Pierre · Inventors: Ancel, Jean-Erick; Bienayme, Hugues; Meilland, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for preparing substituted phenols. More specifically it relates to the condensation of phenols having one or more alkyl substituents with a butadiene derivative comprising at least six carbon atoms including myrcene and/or beta- springene. It also relates to the cyclization to chromanes of the products obtained from the condensation process and their hydrogenation to prepare vitamin E.
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 May 9, 1996 and granted July 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2018.
- 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.