Granted Patent
Utility
US 5,212,896 · App. 07/884,536
Control system for a walk behind trencher machine
Inventors:
Randy H. Hillard, Howard A. Zimmerman, Robert G. Draney, Virgil J. Hill
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: May 15, 1992
Inventors
Randy H. Hillard
Howard A. Zimmerman
Robert G. Draney
Virgil J. Hill
Assignee (at issue)
Case GmbH
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.