Granted Patent
Utility
US 4,467,967 · App. 06/323,274
Manure spreaders
Inventor:
Mervin G. Martin
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Nov 20, 1981
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.