Granted Patent
Utility
US 5,128,592 · App. 07/732,483
High frequency ballast for gaseous discharge lamps
Inventors:
Thomas E. Dean, Russell G. Greenwood, Sylvan E. Irwin, IV
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Jul 18, 1991
Inventors
Thomas E. Dean
Russell G. Greenwood
Sylvan E. Irwin, IV
Assignee (at issue)
THOMAS INDUSTRIES, INC.
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.