Granted Patent
Utility
US 5,609,021 · App. 08/244,183
Operation of an internal combustion engine
Inventor:
Thomas T. Ma
Patented Case
View Patent ↗
Granted: Mar 11, 1997
Filed: May 17, 1994
Inventor
Thomas T. Ma
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.