Iodinated aroyloxy carboxamides
CA 2107597 A1 · Owner: Daum, Sol J. · Inventors: Bacon, Edward R.; Daum, Sol J.; Illig, Carl R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds having the structure wherein (Z?COO is the residue of an iodinated aromatic acid;, n is an integer from 0 to 20; R1 and R2 are independently H, alkyl, fluoroalkyl cycloalkyl, aryl, aralkyl, alkoxy or aryloxy; R3 and R4 are independently a substituent as defined for R1 and R2 above, halogen, hydroxy or acylamino; and R5 and R6 are independently H, alkyl cycloalkyl, aryl, aralkyl, alkoxy, alkoxyalkyl or, acetamidoalkyl;, or R5 and R6, taken together with the nitrogen atom to which they are attached, represent a 4 to 7membered nitrogen containing ring, are useful as contrast agents in, x-ray imaging compositions and methods.
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 October 4, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 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.