Dehydrocholecalciferol derivatives
CA 2016985 C · Owner: F. Hoffmann-La Roche Ag · Inventors: Hennessy, Bernard M.; Baggiolini, Enrico G.; Uskokovic, Milan R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The novel use of compounds of formula, (see formula I) wherein R is H or OH, A is -C~C-, -CH=CH- with E-configuration or -CH2CH2- and R" is H or where A, is -C~C-, R" may also be deuterium for the treatment of sebaceous gland diseases such as, seborrheic dermatitis and, particularly acne: a corresponding, method of treatment as well as pharmaceutical compositions and commercial packages containing such a compound. Novel compounds of formula I wherein R" is deuterium.
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 17, 1990 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 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.