Granted Patent
Utility
US 4,231,335 · App. 06/027,649
Control system for regulating air/fuel ratio
Inventors:
Irving H. Hallberg, Howard C. Paul, Ronald R. Ralston, Roy E. Hunninghaus
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Apr 6, 1979
Inventors
Irving H. Hallberg
Howard C. Paul
Ronald R. Ralston
Roy E. Hunninghaus
Assignee (at issue)
BorgWarner Inc.
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.