Granted Patent
Utility
US 4,542,721 · App. 06/597,325
Starting system/hydraulic system interlock
Inventor:
Hugh K. Williams
Patented Case
View Patent ↗
Granted: Sep 24, 1985
Filed: Apr 6, 1984
Inventor
Hugh K. Williams
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.