Dicarboxylic acid bis-(3,5-dicarbamoyl-2,4,6- triiodoanilides)
CA 1106400 A · Owner: Schering Aktiengesellschaft · Inventors: Speck, Ulrich; Pfeiffer, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides dicarboxylic acid bis-(3,5-dicarbamoyl-2,4,6-triiodoanilides) of the formula (I), in which R1 represents a lower alkyl group substituted by at least one hydroxyl group, R2 represents a hydrogen atom or a lower alkyl group or has the same meaning as the meaning represented by the symbol R1, R3 represents a hydrogen atom or a lower alkyl group and X represents a direct carbon-to-carbon bond or an alkylene group which may be interrupted by at least one oxygen atom and/or may be substituted by at least one substituent selected from hydroxyl groups and lower alkyl groups.
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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.