Granted Patent
Utility
US 4,617,639 · App. 06/638,913
Hour meter apparatus and method
Inventor:
John C. Paine
Patented Case
View Patent ↗
Granted: Oct 14, 1986
Filed: Aug 8, 1984
Inventor
John C. Paine
Assignee (at issue)
Caterpillar Industrial 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.