Granted Patent
Utility
US 4,306,732 · App. 06/101,816
Depth control for agricultural implement
Inventor:
Richard Pettibone
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Dec 10, 1979
Inventor
Richard Pettibone
Assignee (at issue)
J. E. Love Company
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.