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:
Jun. 12, 1979
Filed:
Sep. 07, 1977
Applicant:
Inventors:
Assignee:
Mitsubishi Chemical Industries Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260369 ;
Abstract
A mixture of various dinitroanthraquinone isomers prepared from anthraquinone by mixed acid nitration is subjected to a suspension treatment at a temperature above 50.degree. C. with a mixed acid of a content satisfying the following three equations and then the crystals of 1,5-dinitroanthraquinone are separated: