Granted Patent
Utility
US 4,700,784 · App. 06/824,415
Combined depth-control and wing-lift hydraulic circuit
Inventors:
Kenneth J. Wiebe, J. Richard Harwood, Russell J. Martin
Patented Case
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Granted: Oct 20, 1987
Filed: Jan 31, 1986
Inventors
Kenneth J. Wiebe
J. Richard Harwood
Russell J. Martin
Assignee (at issue)
J. I. Case 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.