Granted Patent
Utility
US 4,300,295 · App. 06/111,821
Snow thrower impeller assembly
Inventor:
Richard A. Heismann
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Jan 14, 1980
Inventor
Richard A. Heismann
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.