Granted Patent
Utility
US 5,332,961 · App. 06/927,618
Resistive oil quality sensor
Inventor:
Robert Henry Hammerle
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Nov 6, 1986
Inventor
Robert Henry Hammerle
Assignee (at issue)
Ford Motor Company
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.