Process for the preparation of isoflavones
CA 2306836 C · Owner: Sreenivasan, Balasubramanian · Inventors: Nair, Muraleedharan G.; Sreenivasan, Balasubramanian
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 an isoflavone from a 2'-hydroxydeoxybenzoin (I) is described. The process uses prepared N,N'-dimethyl(chloromethylene) ammonium chloride as a reactant with (I) in borontrifluoride etherate or other Lewis acid as a solvent. The isoflavones are known biologically active compounds.
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 June 9, 1999 and granted October 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2021.
- 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.