Granted Patent
Utility
US 5,535,839 · App. 08/483,305
Roof drill bit with radial domed PCD inserts
Inventor:
William J. Brady
Patented Case
View Patent ↗
Granted: Jul 16, 1996
Filed: Jun 7, 1995
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.