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. 16, 2003
Filed:
Apr. 04, 2002
Applicant:
Inventors:
Gwan-Sun Lee, Seoul, KR;
Jae-Heon Lee, Kyungki-do, KR;
Young-Kil Chang, Seoul, KR;
Chul-Hyun Park, Seoul, KR;
Gha-Seung Park, Kyungki-do, KR;
Cheol-Kyung Kim, Kyungki-do, KR;
Assignee:
Hanmi Pharm. Co., Ltd., , KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 5/026 ;
U.S. Cl.
CPC ...
C07D 5/026 ;
Abstract
7-amino-3-methoxymethyl-3-cephem-4-carboxylic acid of formula (I) can be easily prepared by reacting 7-aminocephalosporanic acid of formula (II) with an azeotropic mixture of trimethyl borate and methanol in the presence of methanesulfonic acid: