Process for manufacturing (all-rac.)-.alpha.-tocopherol
CA 2340518 A1 · Owner: Haas, Alois · Inventors: Haas, Alois; Hoppmann, Eike; Netscher, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of (all-rac.)-.alpha.-tocopherol by the acidcatalyzed, condensation of trimethylhydroquinone with isophytol or phytol is characterized by, carrying out the condensation in the presence of a tris(perfluoroalkanesulphonyl or, pentafluorobenzenesulphonyl)methane or a metal salt thereof as the catalyst in an organic, solvent. In addition to said metal salt a Bronsted acid e.g. sulphuric acid, phosphoric acid, or p-toluenesulphonic acid may be used as a co-catalyst. The product of the process is the, most active member of the vitamin E group.
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 March 13, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 13, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2023.
- 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.