Granted Patent
Utility
US 5,853,049 · App. 08/807,028
Horizontal drilling method and apparatus
Inventor:
Carl Keller
Patented Case
View Patent ↗
Granted: Dec 29, 1998
Filed: Feb 26, 1997
Inventor
Carl Keller
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.