Granted Patent
Utility
US 4,342,319 · App. 06/220,355
Combined chopper and impeller for an axial flow combine
Inventors:
Billy B. Willis, L. Michael Fetters
Patented Case
View Patent ↗
Granted: Aug 3, 1982
Filed: Dec 29, 1980
Inventors
Billy B. Willis
L. Michael Fetters
Assignee (at issue)
Allis-Chalmers 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.