Granted Patent
Utility
US 4,660,378 · App. 06/685,238
Exhaust system with side branch
Inventor:
Otto H. Scharpf
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Dec 21, 1984
Inventor
Otto H. Scharpf
Assignee (at issue)
Outboard Marine Corporation
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.