Granted Patent
Utility
US 4,630,244 · App. 06/595,324
Rotary acting shear valve for drilling fluid telemetry systems
Inventor:
Michael L. Larronde
Patented Case
View Patent ↗
Granted: Dec 16, 1986
Filed: Mar 30, 1984
Inventor
Michael L. Larronde
Assignee (at issue)
NL Industries, 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.