Granted Patent
Utility
US 6,234,586 · App. 09/400,989
Parking brake lock-in key switch system for vehicle air brake system
Inventors:
Richard B. Davis, Robert L. Douglas, Brad A. Hively, Terry E. Hively, Michael James Lehman, Roy S. Zeitlow
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Jun 1, 1999
Inventors
Richard B. Davis
Robert L. Douglas
Brad A. Hively
Terry E. Hively
Michael James Lehman
Roy S. Zeitlow
Assignee (at issue)
Navistar International Transportation
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.