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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.:

US 4754020 B1

PDFFull Text
Date of Patent:
Jun. 28, 1988

Filed:

Mar. 07, 1986

Process for preparing aromatic diazonium salts by diazotation of amines

Applicant:
Inventors:

Joachim Wolff, Bergisch-Gladbach, DE;

Karlheinz Wolf, Leverkusen, DE;

Reinhold M Klipper, Cologne, DE;

Peter M Lange, Leverkusen, DE;

Assignee:

Bayer Aktiengesellschaft, Leverkusen, DE;

Attorney:

Sprung Horn Kramer & Woods

Primary Examiner:

Floyd D Higel

Int. Cl.
CPC ...
C09B / ; C09B / ; C09B / ; C09B / ;
U.S. Cl.
CPC ...
534581 ; 534560 ; 534561 ; 534565 ; 534582 ; 534583 ; 534632 ; 534638 ; 534775 ; 534829 ; 534887 ;
Abstract

A new method of diazotization consists in using as the diazotizing agent in an aqueous, aqueous organic or organic medium the system comprising salt of nitrous acid+acid insoluble in the reaction medium, in particular organic or inorganic cation exchangers having acid groups. The diazonium salt solutions thus prepared are immediately reacted with coupling components to give azo dyestuffs, the insoluble acid and/or its salt being separated off before or after the coupling.

Find Patent Forward Citations

Wolff, Joachim. (1988). Process for preparing aromatic diazonium salts by diazotation of amines (U.S. Patent No. 4754020). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4754020

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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