Appeal No. 1997-3189
Application 08/592,898
THE INVENTION
Appellants claim a dye mixture which consists essentially of
at least one 1:2 cobalt complex dye of a formazan compound having
a specified formula, and at least one other dye of recited
formulas. Appellants state that “[t]he dye mixtures are
particularly suitable for dyeing or printing natural and
synthetic polyamide fibre materials, dyeings or prints having
good fastness being obtained” (abstract). Claim 25 is
illustrative and is appended to this decision.
THE REFERENCES
References relied upon by the examiner
Balliello et al. (Balliello) 4,944,768 Jul. 31, 1990
J.R. Geigy Co. (Geigy ‘438) 1,370,438 Jul. 15, 19641
(French patent application)
J.R. Geigy A.-G. (Geigy ‘464) 1,019,464 Feb. 9, 1966
(Great Britain patent application)
References relied upon by appellants
C.L. Bird, The Theory and Practice of Wool Dyeing 79 (The Society
of Dyers and Colourists 1972).
VII The Chemistry of Synthetic Dyes 93 (K. Venkataraman ed.,
Academic Press 1974) (Venkataraman).
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