24,24-difluoro-25-hydroxycholecalciferol
CA 1159850 A · Owner: Wisconsin Alumni Research Foundation · Inventors: Deluca, Hector F.; Kobayashi, Yoshiro; Tanaka, Yoko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of 24,24-difluoro-25hydroxy-previtamin D3 of the formula:, which comprises irradiating a compound of the formula: and isolating the desired compound from the reaction mixture. The previtamin D3 is useful in the preparation of 24,24-difluoro-25-hydroxy-vitamin D3.
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 January 3, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 2001.
- 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.