Granted Patent
Utility
US 5,310,474 · App. 07/912,389
Workfunction based A/F sensor
Inventors:
Robert E. Hetrick, Allen L. Schamp
Patented Case
View Patent ↗
Granted: May 10, 1994
Filed: Jul 13, 1992
Inventors
Robert E. Hetrick
Allen L. Schamp
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.