Calciferol derivatives
CA 1311501 C · Owner: Hoffmann-La Roche Inc. · Inventors: Wovkulich, Peter Michael; Baggiolini, Enrico Guiseppe; Batcho, Andrew David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of calciferol derivatives having anti-proliferative and differentiation-inducing activity and having the formula, I, wherein R is hydrogen and the dotted line in the side chain is an optional additional C-C-bond or R is methyl, and the dotted line in the side chain is an additional C-C-bond, in the 25R or 25S epimeric form or as mixtures thereof starting from corresponding indenone derivatives: novel compounds falling under formula I and novel intermediates in the preparation of the compounds of formula I.
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
- Granted December 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2009.
- 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.