Granted Patent
Utility
US 4,512,220 · App. 06/640,534
Fast lead socket wrench
Inventors:
Martin L. Barnhill, III, William T. Pagac
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Aug 13, 1984
Inventors
Martin L. Barnhill, III
William T. Pagac
Assignee (at issue)
Snap-on Tools Company
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.