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:
Sep. 30, 1980
Filed:
Apr. 21, 1978
Applicant:
Inventors:
Shigeo Seki, Tokyo, JP;
Ken Nishihata, Yokohama, JP;
Satoru Nakabayashi, Yokohama, JP;
Toshinori Saito, Yokohama, JP;
Hitoshi Ikeda, Kawasaki, JP;
Nobuo Itoh, Yokohama, JP;
Shokichi Nakajima, Machida, JP;
Shunzo Fukatsu, Tokyo, JP;
Assignee:
Meiji Seika Kaisha Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
544 16 ; 544 21 ; 544 24 ; 544 25 ; 544 26 ; 544 27 ; 544 28 ; 544 29 ; 544 30 ;
Abstract
A novel ester of a cephem compound having a carboxyl group at the 4-position in the nucleus; a process for preparing the same by reacting a cephem carboxylic acid or its salt with a halogenide; and a method for removing the protective group for the carboxyl group in the nucleus of a cephem compound by contacting it with an alcohol, or with an organic solvent in the presence of a Lewis acid.