Granted Patent
Utility
US 4,257,638 · App. 05/619,596
Hook load pin retention system
Inventor:
Edmund R. Koval
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: Oct 6, 1975
Inventor
Edmund R. Koval
Assignee (at issue)
Columbus McKinnon 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.