Granted Patent
Utility
US 6,138,458 · App. 09/204,336
Electro-pneumatic actuator and servo-valve for use therewith
Inventor:
William S. Griffin
Patented Case
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Granted: Oct 31, 2000
Filed: Dec 2, 1998
Inventor
William S. Griffin
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.