Granted Patent
Utility
US 5,202,636 · App. 07/658,939
Method of non-destructive lamp testing by sensing light output
Inventor:
Robert A. Powell
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Feb 22, 1991
Inventor
Robert A. Powell
Assignee (at issue)
Cooper Industries Holdings
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.