Granted Patent
Utility
US 4,418,935 · App. 06/330,508
Pin lock for adjustable link of a three-point hitch
Inventor:
John O'Connor
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Dec 14, 1981
Inventor
John O'Connor
Assignee (at issue)
Allis-Chalmers 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.