Novel benzofuranone derivatives and process for producing the same
CA 2248953 C · Owner: Yoshihama, Makoto · Inventors: Nakayama, Shoji; Nakamura, Junji; Nakakoshi, Masamichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel benzofuranone derivatives useful as a preventive or remedy for hormonedependent diseases and represented by specific general formula (I). The production process comprises reacting a specific benzofuranone compound with a specific benzaldehyde compound.
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 13, 1998 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 2020.
- 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.