Granted Patent
Utility
US 5,077,970 · App. 07/536,372
Method of on-board detection of automotive catalyst degradation
Inventor:
Douglas R. Hamburg
Patented Case
View Patent ↗
Granted: Jan 7, 1992
Filed: Jun 11, 1990
Inventor
Douglas R. Hamburg
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.