A process for preparation of bisphosphonic acid compounds
CA 2536229 C · Owner: Chitturi, Trinadha Rao · Inventors: Patel, Vijaykumar Muljibhai; Chitturi, Trinadha Rao; Thennati, Rajamannar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a novel process for preparation of bisphosphonic acids or salts thereof e.g. alendronic acid, by reacting a carboxylic acid phosphorous acid and a halophosphorous compound in a water miscible neutral solvent.
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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 August 10, 2004 and granted September 25, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 10, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 2026.
- 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.