New process for the preparation of retiferol derivatives
CA 2323311 A1 · Owner: Hilpert, Hans · Inventors: Hilpert, Hans; Wirz, Beat
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New Process for the Preparation of Retiferol Derivatives The invention is concerned with a new process for the preparation of retiferol derivatives of formula I:, wherein, A is -C =C- or -CH=CHand, R1 and R2 are independently of each other lower alkyl or lower perfluoroalkyl, by, method A) which comprises the coupling of ketones of formula II with compounds of formula III or by, method B) which comprises the coupling of phosphinoxides of formula IV with aldehydes of formula V, Compounds of formula I are useful in the treatment or prevention of hyperproliferative skin diseases, particularly psoriasis basal cell , carcinomas, disorders of, keratinization and keratosis; or for reversing the …
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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 October 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2022.
- 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.