Granted Patent
Utility
US 5,139,051 · App. 07/723,847
Unloading valve for an air compressor system
Inventors:
Dennis Walstad, Jean-Francois Couvreur
Patented Case
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Granted: Aug 18, 1992
Filed: Jul 1, 1991
Inventors
Dennis Walstad
Jean-Francois Couvreur
Assignee (at issue)
Furnas Electric Co.
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.