Granted Patent
Utility
US 5,456,230 · App. 08/245,977
Four-stroke internal combustion engine with contaminated oil elimination
Inventors:
Russell J. VanRens, William B. Rush, II
Patented Case
View Patent ↗
Granted: Oct 10, 1995
Filed: May 19, 1994
Inventors
Russell J. VanRens
William B. Rush, II
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.