Granted Patent
Utility
US 5,603,386 · App. 08/524,953
Downhole tool for controlling the drilling course of a borehole
Inventor:
David Webster
Patented Case
View Patent ↗
Granted: Feb 18, 1997
Filed: Sep 8, 1995
Inventor
David Webster
Assignee (at issue)
Ledge 101 Limited
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.