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:
May. 05, 1981
Filed:
Nov. 05, 1979
Applicant:
Inventors:
Friedrich Werner, Cologne, DE;
Heinz U Blank, Odenthal, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
564435 ; 2604 / ; 2604 / ; 2604 / ; 560 19 ; 560139 ; 560141 ; 560142 ; 562433 ;
Abstract
A process for the preparation of hydroxy-diphenylamines by condensation of dihydroxybenzene with an excess amount of primary aromatic amine in the presence of a catalytic amount of an acid at elevated temperature is described wherein the excess aromatic amine and, if appropriate, the reaction product is distilled off from the reaction mixture in the presence of a base.
Werner, Friedrich. (1981). Process for the preparation of hydroxy-diphenylamines (U.S. Patent No. 4265833). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4265833
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile