16-ene-vitamin d derivatives
CA 2275382 A1 · Owner: Kawase, Akira · Inventors: Kawase, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vitamin D derivatives of general formula (1) wherein X represents oxygen or sulfur; R11 represents saturated or unsaturated aliphatic hydrocarbyl which may be substituted by hydroxyl or protected hydroxyl or -COR12 (wherein R12 , represents alkyl aryl or alkoxyl); R2 represents -OR9 or hydrogen; and R9 and R10 each represent hydrogen or hydroxyl; a process for producing them; intermediates for them; and medicines characterized by containing them.
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 December 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 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.
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.