Granted Patent
Utility
US 4,466,415 · App. 06/535,638
EGR Control systems for diesel engines
Inventor:
Gunter Piesche
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Sep 19, 1983
Inventor
Gunter Piesche
Assignee (at issue)
RANCO CO., Ltd.
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.