Bis-azomethine metal complex colorants of hydroxycoumarin derivatives or hydroxychromone derivatives and process for their manufacture
CA 1064950 A · Owner: Ciba-Geigy Ag · Inventors: Vuitel, Laurent; Pugin, Andre; L'Eplattenier, Francois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bis-azomethine metal complex colorants of the formulae, or, wherein M denotes a divalent transition metal cation zinc, ion or cadmium ion, X denotes an isocyclic or heterocyclic aromatic radical to which the two nitrogen atoms are bonded in the o- or peri-position to one another and Y1 and Y2 denote hydrogen, halogen, alkyl, aryl nitro, alkoxy, phenoxy or hydroxyl, which are suitable for pigmenting highmolecular organic material.
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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 October 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 23, 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.