Granted Patent
Utility
US 4,894,496 · App. 07/213,089
Auxiliary winding cut-out switch for sump pump motor
Inventor:
Nicholas R. Palumbo
Patented Case
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Granted: Jan 16, 1990
Filed: Jun 29, 1988
Inventor
Nicholas R. Palumbo
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.