Granted Patent
Utility
US 4,362,272 · App. 06/172,976
Manure spreader with multiple side auger
Inventor:
Mervin G. Martin
Patented Case
View Patent ↗
Granted: Dec 7, 1982
Filed: Jul 28, 1980
Inventor
Mervin G. Martin
Assignee (at issue)
Hedlund Manufacturing Co., Inc.
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.