Granted Patent
Utility
US 3,948,228 · App. 05/521,310
Exhaust gas sensor operational detection system
Inventor:
David G. Luchaco
Patented Case
View Patent ↗
Granted: Apr 6, 1976
Filed: Nov 6, 1974
Inventor
David G. Luchaco
Assignee (at issue)
Bendix 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.