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. 02, 1981
Filed:
Jan. 29, 1980
Applicant:
Inventors:
Mitsuru Nagata, Yokohama, JP;
Kazuyuki Wakasugi, Yokohama, JP;
Assignee:
Hodogaya Chemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603434 ;
Abstract
3,3-Bis-(4-dimethylaminophenyl)-6-dimethylaminophthalide is produced by oxidizing an alkali metal salt of 2-[4,4'-bis-(dimethylamino)-benzhydryl]-5-dimethylaminobenzoic acid in an aqueous solution of pH of 8 to 14 with hydrogen peroxide, oxygen or air in the presence of a catalyst selected from the group consisting of cobalt compounds and copper compounds.