Granted Patent
Utility
US 4,284,777 · App. 06/121,487
Antibacterials: 1-difluoromethyl-6,7-methylenedioxy-1,4-dihydro-4-oxo-3-quinolinecarboxy lic acid and its esters
Inventor:
Kyu T. Lee
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Feb 14, 1980
Inventor
Kyu T. Lee
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.