The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1994
Filed:
Feb. 26, 1993
Applicant:
Inventors:
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D06P / ;
U.S. Cl.
CPC ...
8437 ; 8436 ; 8641 ; 8602 ;
Abstract
Dye mixtures comprising at least two metal-free dyes of different colors having in each case two sulfo or carboxyl groups and a molecular weight of between 790 and 1100 are used for dyeing leather. A trichromatic dye mixture comprising at least one yellow dye of the formula (1), at least one red dye of the formula (2) and at least one blue dye of the formula (3) according to claim 2 is preferably used. Leather can be dyed in brilliant shades using these dye mixtures.