Granted Patent
Utility
US 6,161,635 · App. 09/260,159
Drilling system drive steel
Inventor:
William J. Brady
Patented Case
View Patent ↗
Granted: Dec 19, 2000
Filed: Mar 1, 1999
Inventor
William J. Brady
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.