Granted Patent
Utility
US 4,861,296 · App. 07/137,509
Marine propulsion device exhaust system
Inventor:
Richard A. Wlezien
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Dec 23, 1987
Inventor
Richard A. Wlezien
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.