Granted Patent
Utility
US 5,117,680 · App. 07/727,038
Method and control circuit for measuring trace constituents in automotive engine exhaust
Inventor:
Alex D. Colvin
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Jul 8, 1991
Inventor
Alex D. Colvin
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.