Granted Patent
Utility
US 4,448,259 · App. 06/369,571
Rubber spring for furrow opener
Inventors:
Arthur J. Ford, Patrick Kuhn, William D. Long
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Apr 19, 1982
Inventors
Arthur J. Ford
Patrick Kuhn
William D. Long
Assignee (at issue)
Lilliston 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.