Granted Patent
Utility
US 6,581,639 · App. 09/981,103
Low leak boom control check valve
Inventors:
George T. Fiala, David W. Swaim
Patented Case
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Granted: Jun 24, 2003
Filed: Oct 17, 2001
Inventors
George T. Fiala
David W. Swaim
Assignee (at issue)
Case GmbH
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.