Non-ionic polyol contrast media from ionic contrast media
CA 1339666 C · Owner: Ranganathan, Ramachandran · Inventors: Ranganathan, Ramachandran; Sovak, Milos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel non-ionic contrast media are, efficiently prepared from generally available ionic contrast media or non-iodinated precursors. Particularly polyhydroxyhalo-hydrocarbons are employed with a triiodo-substituted acylamido benzoic acids in aqueous weakly basic media to selectively substitute the amido nitrogen, followed by activation of the carboxyl group for amide formation.
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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
- Granted February 10, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 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.