Granted Patent
Utility
US 4,536,815 · App. 06/527,602
Protective relay apparatus and method for providing single-pole tripping
Inventors:
Hung J. Li, Leonid Husak
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Aug 29, 1983
Inventors
Hung J. Li
Leonid Husak
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.