Granted Patent
Utility
US 5,271,221 · App. 07/986,414
Integrated feedback controlled secondary air injection and egr
Inventor:
Peter Mitchell Lyon
Patented Case
View Patent ↗
Granted: Dec 21, 1993
Filed: Dec 7, 1992
Inventor
Peter Mitchell Lyon
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.