Granted Patent
Utility
US 4,652,176 · App. 06/713,929
Vibratory plow with blade having regressive longitudinal axis
Inventor:
Emil T. Leonard
Patented Case
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Granted: Mar 24, 1987
Filed: Mar 20, 1985
Inventor
Emil T. Leonard
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.