Granted Patent
Utility
US 4,470,091 · App. 06/435,441
Productive relay apparatus for protection from sub-synchronous current oscillations in a power system
Inventors:
Shan C. Sun, Robert J. Delcoco
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Oct 20, 1982
Inventors
Shan C. Sun
Robert J. Delcoco
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.