Process for the trichromatic dyeing of leather
CA 1290104 C · Owner: Ciba-Geigy Ag · Inventors: Koller, Josef; Beffa, Fabio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A process for trichromatic dyeing of leather with a mixture comprising a yellow, a red and a blue dye said yellow, dye and said red dye each being of the formula (I), wherein Z are nitrogen or a CH group A and C are radicals of the, :, benzene or naphthalene series B and D are the radicals of a, coupling component if Z is nitrogen X are oxygen or -NR-group, Me is chromium or cobalt,: Y is the SO3H COOH or PO3H2 group; p is, 1 or 2 and n is an integer from 1 to 6 which process comprises, the use of an aqueous dye bath which contains a grey dye of the formula, (II), wherein R1 and R3 are hydrogen or sulfo A1 and A2 are the radicals, of 1- or 2-hydroxynaphthalene R2 …
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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 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 8, 2008.
- 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.