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:
Jan. 29, 1985
Filed:
Dec. 11, 1981
Applicant:
Inventor:
Ian R Wheeler, Houston, GB;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
534579 ;
Abstract
A process for the production of an azo compound comprising contacting with agitation a solution or dispersion of a diazotizable amine, a solution or dispersion of a coupling component and an organic or inorganic nitrite compound, in a water insoluble liquid organic acid, adding to the reaction mixture so formed aqueous alkali to transfer the organic acid, as its soluble salt, into the aqueous phase and separating the azo compound from the liquors. The azo compounds are produced in high yield and purity and are suitable for use as pigments and disperse dyes.