Canadian application, no grantCanada
Vitamin d3 analogs
CA 2108848 A1 · Owner: Hoffmann-La Roche Inc. · Inventors: Doran, Thomas I.; Mclane, John Arthur; Okabe, Masami
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula, I, wherein R1 and R2 are hydrogen or acyl; provided t hat only one of R1 or R2 is hydrogen, useful in the treatment of hyperproliferative skin diseases and sebaceous gland diseases.
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 October 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 20, 1993
GrantedNo grant recorded
Term endedOctober 20, 2013
Patent numberCA 2108848 A1
Classification (IPC)C07C401/00 +2 more
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.