Granted Patent
Utility
US 6,588,994 · App. 09/858,254
Drill bit tail
Inventor:
James L. Wienhold
Patented Case
View Patent ↗
Granted: Jul 8, 2003
Filed: May 15, 2001
Inventor
James L. Wienhold
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.