Granted Patent
Utility
US 4,899,579 · App. 07/252,620
Onboard diagnostic system of vehicle ignition system
Inventors:
Michael Stephen Sweppy, Richard R. Tuttle, Everett P. Schumaker
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Oct 3, 1988
Inventors
Michael Stephen Sweppy
Richard R. Tuttle
Everett P. Schumaker
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.