Granted Patent
Utility
US 4,902,938 · App. 07/098,580
Electronic ballast with high voltage protection
Inventor:
John Lindquist
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Sep 18, 1987
Inventor
John Lindquist
Assignee (at issue)
Magnetek, 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.