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:
Feb. 03, 1981
Filed:
Apr. 25, 1979
Applicant:
Inventors:
Sisto S Papa, Milan, IT;
Renzo Ferrario, Ceriano Laghetto, IT;
Assignee:
Aziende Colori Nazionali Affini Acna S.p.A., Milan, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ; D06P / ; D06P / ;
U.S. Cl.
CPC ...
260173 ; 260169 ;
Abstract
The present invention concerns a new acid trisazo dye suited for the dyeing of natural and synthetic polyamidic fibres and particularly for the dyeing of leather. The dye has the following structural formula: ##STR1## and dyes in a full black shade. The present invention also includes a process for the preparation of dye (I) and comprises tetrazotizing 4-4' diaminoazobenzene and then coupling the tetrazo-compound thus formed with 2 molecules of 2-carboxymethylamino-8-naphtol-6-sulphonic acid (carboxy methyl-gamma acid) in an alkaline medium.