Granted Patent
Utility
US 4,382,210 · App. 06/332,065
Ballast circuit for direct current arc lamp
Inventor:
Carl F. Buhrer
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Dec 18, 1981
Inventor
Carl F. Buhrer
Assignee (at issue)
GTE Laboratories Incorporated
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.