Granted Patent
Utility
US 4,854,409 · App. 07/122,399
Lift axle control system
Inventors:
Robert D. Hillebrand, Charles Wilson
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Nov 19, 1987
Inventors
Robert D. Hillebrand
Charles Wilson
Assignee (at issue)
Lear Siegler, Inc.
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.