Granted Patent
Utility
US 5,875,858 · App. 08/689,667
Low volume air-water drilling systems and methods
Inventor:
William J. Brady
Patented Case
View Patent ↗
Granted: Mar 2, 1999
Filed: Aug 13, 1996
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.