Granted Patent
Utility
US 4,431,357 · App. 06/276,592
Tailgate control system for round bale wagon
Inventor:
L. Dennis Butler
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Jun 23, 1981
Inventor
L. Dennis Butler
Assignee (at issue)
Sperry Corp.
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.