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:
Aug. 18, 2009
Filed:
Oct. 22, 2004
Applicants:
Hyun-ik Shin, Daejeon, KR;
Jay-hyok Chang, Daejeon, KR;
Kyu-woong Lee, Daejeon, KR;
Inventors:
Assignee:
LG Life Sciences Ltd., Seoul, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 471/02 (2006.01); C07D 215/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Starting from ethyl 3-(2,6-dichloro-5-fluoropyridin-3-yl)-3-oxo-propanoate (1), the present invention provides highly pure 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid (5) in one-pot four steps using a single solvent.