Granted Patent
Utility
US 4,841,934 · App. 07/017,292
Oxygen pumping device for control of the air fuel ratio
Inventors:
Eleftherios M. Logothetis, Robert E. Hetrick, Richard E. Soltis, William C. Vassell
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Feb 20, 1987
Inventors
Eleftherios M. Logothetis
Robert E. Hetrick
Richard E. Soltis
William C. Vassell
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.