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:
Mar. 02, 1976
Filed:
Jan. 10, 1974
Applicant:
Inventors:
Christian Wittwer, Bottmingen, CH;
Emil Bonometti, Basel, CH;
Assignee:
Ciba-Geigy AG, Basel, CH;
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ;
U.S. Cl.
CPC ...
260151 ; 2601 / ; 2601 / ; 2601 / ; 2601 / ; 2601 / ; 2601 / ; 2601 / ; 260147 ; 260148 ; 260149 ; 260150 ;
Abstract
The present invention relates to a process for the manufacture of 1:2 chromium complexes of metallisable azo dyes, wherein the azo dyes are treated in aqueous solution at pH 7 to 9 with at least the stoichiometric amount of a chromium complex, and, in the course of the chroming, the reaction medium is acidified once or repeatedly to a pH of 6 or less and subsequently brought back again to pH 7 to 9.