Naphtholactam dyestuffs
CA 1086318 A · Owner: Ciba-Geigy Ag · Inventors: Zickendraht, Christian; Schwander, Hansrudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dyestuff of the general formula (I) (I), in which R represents alkyl, alkenyl cycloalkyl, aralkyl, aryl or preferably hydrogen, M represents hydrogen or a, cation Y represents a free or modified carboxyl group Z, represents a non-ionic substituent, n represents 0 1 or 2, A, represents a heterocyclic radical or an aromatic radical having negative substituents and B and C can carry further non-ionic substituents. The dyestuffs give brilliant red and yellow shades on polyester fibers.
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 September 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 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.