Flavone derivatives, preparation method and use as medicines
CA 2403424 C · Owner: Zhang, Jidong · Inventors: Zhang, Jidong; Lefrancois, Dominique; Haesslein, Jean-Luc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns novel products of formula (I) wherein: R1 represents a carbocyclic or heterocyclic radical optionally substituted; R2 and R3 are such that one represents hydrogen and the other represents piperidinyl optionally substituted; R4 represents hydrogen alkyl or phenyl optionally substituted said products being in all isomeric and salt forms and used as medicines.
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 February 27, 2001 and granted February 1, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2023.
- 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.