Granted Patent
Utility
US 6,378,619 · App. 09/897,874
Agricultural ground working implement with hydraulic downpressure circuit
Inventors:
Dean Mayerle, David R. Hundeby
Patented Case
View Patent ↗
Granted: Apr 30, 2002
Filed: Jul 3, 2001
Inventors
Dean Mayerle
David R. Hundeby
Assignee (at issue)
Flexi-Coil Ltd.
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.