Granted Patent
Utility
US 4,991,661 · App. 07/513,069
Lock-up mount apparatus for an earth working tillage tool
Inventor:
Roger S. Barenthsen
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Apr 23, 1990
Inventor
Roger S. Barenthsen
Assignee (at issue)
Alloway Manufacturing
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.