Granted Patent
Utility
US 5,667,443 · App. 08/335,448
Bolt including a cleaning thread point tip
Inventor:
John Allen
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Nov 7, 1994
Inventor
John Allen
Assignee (at issue)
Ring Screw Works
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.