Granted Patent
Utility
US 4,591,940 · App. 06/682,403
Signal quality monitor for protective relay system
Inventors:
Shan C. Sun, James P. McGivern
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Dec 17, 1984
Inventors
Shan C. Sun
James P. McGivern
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.