Fluorine-containing vitamin d3 analogues
CA 2107471 C · Owner: Taguchi, Takeo · Inventors: Ohira, Yutaka; Kobayashi, Yoshiro; Ikekawa, Nobuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fluorine-containing vitamin D3 analogues of formula (I) wherein R1, R2 and R3 , are independently hydrogen atom a, hydroxy-protecting group, having excellent pharmacological activities such as , tumor cell differentiation-inducing activity which are useful as a medicament.
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 January 26, 1993 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 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.
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.