Compositions of iodophenyl esters and iodophenyl sulfonates for visualization of the gastrointestinal tract
CA 2115910 A1 · Owner: Sterling Winthrop Inc. · Inventors: Bacon, Edward R.; Josef, Kurt A.; Douty, Brent D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are novel iodophenyl carboxylic or sulfonic acid esters of the formula:, wherein, X is -CO- or -SO2-; Z is H, halo, C1-C20 alkyl, cycloalkyl lower alkoxy or, cyano, where the alkyl and cycloalkyl groups can be substituted with halogen or halo-lower-alkyl groups; R is C1-C25 alkyl, cycloalkyl, aryl, or halo-loweralkyl, each optionally substituted with halo fluoro-lower-alkyl, aryl, lower-alkoxy hydroxy, carboxy or lower-alkoxy carbonyl lower-alkenyl, lower-alkynyl, lower-alkylene lower-alkoxy-, carbonyloxy;, n is 1-5; y is 0-4; and, w is 1-4, useful as x-ray contrast agents in diagnostic radiology of the gastrointestinal tract.
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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 February 17, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 17, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2016.
- 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
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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.