Granted Patent
Utility
US 4,391,335 · App. 06/230,979
Rotary hoe wheel
Inventor:
Eugen J. Birkenbach
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Feb 2, 1981
Inventor
Eugen J. Birkenbach
Assignee (at issue)
International Harvester 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.