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:
Dec. 12, 1989
Filed:
Jun. 28, 1988
Applicant:
Inventors:
Holger Hahn, Grenzach-Wyhlen, DE;
Rudolf Blattner, Rheinfelden, DE;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544 76 ; 544 75 ; 544 77 ;
Abstract
A process for the preparation of triphendioxazines of oxidising cyclisation of 2,5-diarylamino-1,4-benzoquinones with oleum and further optional oxidising agents and/or catalysts, which process comprises charging a reactor simultaneously with the 2,5 diarylamino-1,4-benzoquinone and oleum.