Granted Patent
Utility
US 4,523,892 · App. 06/609,676
Hydrostatic vehicle control
Inventors:
Randall M. Mitchell, John T. Armstrong, Jr.
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: May 14, 1984
Inventors
Randall M. Mitchell
John T. Armstrong, Jr.
Assignee (at issue)
Caterpillar Tractor Co.
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.