Granted Patent
Utility
US 4,581,880 · App. 06/593,917
Crop engaging apparatus and methods
Inventor:
Wilfred E. Klinner
Patented Case
View Patent ↗
Granted: Apr 15, 1986
Filed: Mar 27, 1984
Inventor
Wilfred E. Klinner
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.