X-ray contrast media
CA 1071228 A · Owner: Laboratoires Andre Guerbet · Inventors: Hardouin, Michel J.C.; Lautrou, Jean; Tilly, Guy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to compounds of the formula; I, in which:, R1 represents a hydrogen atom or a radical of the formula in which R4 and R5 represents, independently of each other, a hydrogen atom or a lower alkyl radical R2 represents a hydrogen atom or a lower alkanoyl radical R3 represents a hydrogen atom, a lower alkyl radical or a lower alkanoyl radical, n is 3 or 4, and their lower alkyl esters and their salts with pharmaceutically acceptable bases. Said compounds are useful as X-ray contrast media.
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
- Granted February 5, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 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.