Granted Patent
Utility
US 4,734,616 · App. 06/915,911
Fluoresent lamp with double cathode and probe
Inventor:
Donald P. Northrop
Patented Case
View Patent ↗
Granted: Mar 29, 1988
Filed: Oct 1, 1986
Inventor
Donald P. Northrop
Assignee (at issue)
Duro-Test Corporation
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.