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:
Oct. 04, 1977
Filed:
Apr. 11, 1975
Applicant:
Inventors:
Ermanno Gaetani, Milan, IT;
Sandro Ponzini, Saronno (Varese), IT;
Assignee:
Aziende Colori Nazionali Affini ACNA S.p.A., Milan, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
260169 ; 260149 ; 260159 ; 260166 ;
Abstract
New direct dyes which can be diazotized on fibers and have the general formula ##STR1## are disclosed. In the formula, A and B, which are different from each other, are amino-naphtholsulphonic acids. A process for making the new dyes by coupling one mole of a tetrazo derivative of 4,4-diamino-azobenzol with a mixture containing substantially one mole of the amino-naphtholsulphonic acid A and one mole of the different amino-naphtholsulphonic acid B, in an alkaline medium, is also enclosed.