Granted Patent
Utility
US 4,237,983 · App. 05/967,412
Combination tiller and cultivator and reversible drive assembly therefor
Inventor:
Douglas Allen
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Dec 7, 1978
Inventor
Douglas Allen
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.