Granted Patent
Utility
US 4,377,914 · App. 06/288,821
Vertical lift and blade control mechanism for cable plows
Inventors:
Robert G. Draney, Howard A. Zimmerman
Patented Case
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Granted: Mar 29, 1983
Filed: Jul 31, 1981
Inventors
Robert G. Draney
Howard A. Zimmerman
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.