Granted Patent
Utility
US 4,538,196 · App. 06/487,480
Protective relay apparatus and method for providing single-pole tripping
Inventors:
Shan C. Sun, James P. Garitty
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Apr 22, 1983
Inventors
Shan C. Sun
James P. Garitty
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.