Granted Patent
Utility
US 4,464,697 · App. 06/397,758
Protective relay system
Inventor:
Shan C. Sun
Patented Case
View Patent ↗
Granted: Aug 7, 1984
Filed: Jul 13, 1982
Inventor
Shan C. Sun
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.