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:
Jul. 07, 1992
Filed:
Jan. 22, 1990
Takashi Kamiya, Ibaraki, JP;
Toshihiko Naito, Ibaraki, JP;
Yuuki Komatu, Ibaraki, JP;
Yasunobu Kai, Ibaraki, JP;
Takaharu Nakamura, Chiba, JP;
Manabu Sasho, Ibaraki, JP;
Shigeto Negi, Ibaraki, JP;
Isao Sugiyama, Ibaraki, JP;
Kanemasa Katsu, Ibaraki, JP;
Hiroshi Yamauchi, Ibaraki, JP;
Eisai Co., Ltd., Tokyo, JP;
Abstract
A cephem derivative represented by the following formula: ##STR1## wherein R.sub.1 means a fluorine-substituted lower alkyl and A.sub.1 denotes a cyclic or acyclic ammonio group, or a non-toxic salt thereof, is prepared by reacting a compound represented by the following formula: ##STR2## wherein A.sub.1 has the same meaning as defined above, with another compound represented by the following formula: ##STR3## wherein R.sub.1 has the same meaning as defined above, and if necessary, removing the protecting groups.