Granted Patent
Utility
US 4,401,134 · App. 06/240,875
Pilot valve initiated mud pulse telemetry system
Inventor:
Patrick E. Dailey
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Mar 5, 1981
Inventor
Patrick E. Dailey
Assignee (at issue)
SMITH INTERNATIONAL, 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.