Granted Patent
Utility
US 5,642,019 · App. 08/539,826
Safety protector for non-isolated ballasts
Inventor:
Ning Sun
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Oct 6, 1995
Inventor
Ning Sun
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.