Granted Patent
Utility
US 4,389,554 · App. 06/163,131
Transformer protective switch
Inventor:
Willie B. Freeman
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Jun 26, 1980
Inventor
Willie B. Freeman
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.