Granted Patent
Utility
US 4,838,077 · App. 07/134,407
Apparatus and method for monitoring the operation of a vehicle drive shaft
Inventors:
Glenn Shifflet, Herbert C. Johnson, Paul W. Revenaugh
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Dec 17, 1987
Inventors
Glenn Shifflet
Herbert C. Johnson
Paul W. Revenaugh
Assignee (at issue)
DANA LIMITED
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.