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. 30, 1976
Filed:
Feb. 20, 1974
Applicant:
Inventors:
Kurt Gengnagel, Offenbach, Main, DT;
Theodor Papenfuhs, Frankfurt am Main, DT;
Manfred Zimmermann, Offenbach, Main, DT;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2605 / ;
Abstract
An improved process for the manufacture of aromatic sulfonic acid halides from aromatic diazonium compounds, wherein aromatic diazonium compounds are reacted in a strongly hydrochloric or hydrobromic solution in the presence of copper or copper compounds with an alkali metal hydrogeno-sulfite, which avoids the use of liquid or gaseous sulfur dioxide and of organic solvents according to known processes which makes the process, if carried out on a technical scale, expensive and strongly contaminates the waste water.