Granted Patent
Utility
US 4,810,166 · App. 07/080,791
Controllable pitch marine propeller
Inventors:
Paul A. Sawizky, Stephen Craig Olson, JR., Ole H. Midttun
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Aug 3, 1987
Inventors
Paul A. Sawizky
Stephen Craig Olson, JR.
Ole H. Midttun
Assignee (at issue)
Bird-Johnson Company
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.