Granted Patent
Utility
US 5,941,321 · App. 09/122,596
Method and apparatus for drilling a planar curved borehole
Inventor:
W. James Hughes
Patented Case
View Patent ↗
Granted: Aug 24, 1999
Filed: Jul 27, 1998
Inventor
W. James Hughes
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.