Granted Patent
Utility
US 5,535,835 · App. 08/341,547
Straight/directional drilling device
Inventor:
Colin Walker
Patented Case
View Patent ↗
Granted: Jul 16, 1996
Filed: Feb 9, 1995
Inventor
Colin Walker
Assignee (at issue)
Baroid Technology, Inc.
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.