Granted Patent
Utility
US 4,357,644 · App. 06/245,768
Ratio ground relays
Inventor:
Warren J. Schmidt
Patented Case
View Patent ↗
Granted: Nov 2, 1982
Filed: Mar 20, 1981
Inventor
Warren J. Schmidt
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.