Granted Patent
Utility
US 4,403,473 · App. 06/287,543
Ammonia/fuel ratio control system for reducing nitrogen oxide emissions
Inventor:
John R. Gladden
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Jun 22, 1981
Inventor
John R. Gladden
Assignee (at issue)
Caterpillar Tractor Co.
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.