Granted Patent
Utility
US 4,890,005 · App. 07/118,257
Standby power supply line voltage fault detector
Inventor:
Louis W. Schornack
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Nov 9, 1987
Inventor
Louis W. Schornack
Assignee (at issue)
Perma Power Electronics, 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.