Granted Patent
Utility
US 5,190,937 · App. 07/640,069
Lactam derivatives
Inventors:
Roger E. Markwell, Ian Hughes
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Jan 11, 1991
Inventors
Roger E. Markwell
Ian Hughes
Assignee (at issue)
Beecham Group plc
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.