Granted Patent
Utility
US 4,550,783 · App. 06/123,277
Self-propelled aerating device
Inventor:
Loren F. Hansen
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Feb 21, 1980
Inventor
Loren F. Hansen
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.