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:
Feb. 28, 1978
Filed:
Apr. 15, 1976
Applicant:
Inventors:
Assignee:
Ihara Chemical Industry Co., Ltd., Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
260301 ; 560 18 ; 560 14 ;
Abstract
An o-sulfobenzimide having the formula: ##STR1## is prepared by reacting phosgene with a methylbenzoate-o-sulfonate having the formula: ##STR2## WHEREIN M represents potassium or calcium, n is 1 when M is K and n is 2 when M is Ca, in an inert organic solvent in the presence of dimethylformamide; and then reacting ammonia with the reaction product.