Granted Patent
Utility
US 4,924,840 · App. 07/253,523
Fast response exhaust gas recirculation (EGR) system
Inventor:
Wallace R. Wade
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Oct 5, 1988
Inventor
Wallace R. Wade
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.