Water-soluble, non ionic radioopaque contrast agents (x-ray contrast agents) and process for their production
CA 1089489 A · Owner: Bracco Industria Chimica Societa Per Azioni · Inventors: Pitre, Davide; Felder, Ernst H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
alpha. .omega.-bis-5-(dihydroxyalkyl) aminocarbonyl-3hydroxyacyl-amino-2,4,6-triiodo-benzoyl-amino-oxaalkane compounds of the formula, wherein R1 is R and R' are hydrogen or methyl, R2 is dihydroxyalkyl having 3 or 4 carbon atoms n is 2 or 3, m is an integer between 1 and 5 and, n(m+1) is an integer between 4 and 12 are readily soluble in water to yield injectable radiopaque contrast compositions which are well tolerated and stable. The compounds are prepared in good yields by reacting a reactive derivative of a 5-(di-hydroxyalkyl)aminocarbonyl-3-acyloxyacylamino-2,4,6-triiodo-benzoic acid with an .alpha..omega.-diamino-oxaalkane of the formula R - NH - CnH2n- (O- CnH2n) - NH - R
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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 November 11, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 11, 1997.
- 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.