Dicarboxylic acids which contain heterocyclic rings and process for their manufacture
CA 1060025 A · Owner: Ciba-Geigy Ag · Inventors: Herzog, Hans; Buxbaum, Lothar; Habermeier, Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dicarboxylic acids and dicarboxylic acid derivatives which contain an N,N-imidazolidine-4,5-dione ring and have the formula: (I), in which R is alkylene, cyclohexylene phenylene or benzylene, R1 and R2 each represent hydrogen, alkyl, cycloalkyl or phenyl or together represent C4 to C7 alkylene and X represents carboxyl, nitrite chlorocarbonyl, phenoxycarbonyl, or alkoxycarbonyl are useful monomers for the manufacture of polymers in, particular polyesters.
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 7, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 7, 1996.
- 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.