Granted Patent
Utility
US 4,019,323 · App. 05/636,511
Controller for turbocharger system for internal combustion engines
Inventor:
Arthur A. Zuhn
Patented Case
View Patent ↗
Granted: Apr 26, 1977
Filed: Dec 1, 1975
Inventor
Arthur A. Zuhn
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.