Granted Patent
Utility
US 4,378,031 · App. 06/041,493
Electrohydraulic servovalve
Inventors:
Robert D. Nicholson, Harish S. Patel, Alger T. Daniel
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: May 22, 1979
Inventors
Robert D. Nicholson
Harish S. Patel
Alger T. Daniel
Assignee (at issue)
Koehring Company
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.