Granted Patent
Utility
US 4,451,789 · App. 06/306,209
Logging tool and method for measuring resistivity of different radial zones at a common depth of measurement
Inventor:
Richard A. Meador
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Sep 28, 1981
Inventor
Richard A. Meador
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.