Granted Patent
Utility
US 4,778,419 · App. 07/063,208
Reverse thrust propeller
Inventors:
Robert Bolle, Donald A. Henrich
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Jun 16, 1987
Inventors
Robert Bolle
Donald A. Henrich
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.