Granted Patent
Utility
US 4,970,458 · App. 07/349,016
AC voltage sensing for voltage regulators
Inventor:
David A. Fox
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: May 8, 1989
Inventor
David A. Fox
Assignee (at issue)
Westinghouse Electric Company LLC
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.