Canadian application, no grantCanada
New vitamin d derivatives with carbo- or heterocyclic substituents at c-25, process for their production, intermediate products and use for the production of pharmaceutical agents
CA 2253288 A1 · Owner: Schwarz, Katica · Inventors: Haberey, Martin; Fahnrich, Marianne; Steinmeyer, Andreas
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns new vitamin D derivatives of general formula (I) a process for their production, their use for production of medicaments and , intermediate products used in the process.
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 April 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 21, 1997
GrantedNo grant recorded
Term endedApril 21, 2017
Patent numberCA 2253288 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.