Granted Patent
Utility
US 4,785,247 · App. 07/036,170
Drill stem logging with electromagnetic waves and electrostatically-shielded and inductively-coupled transmitter and receiver elements
Inventors:
Richard A. Meador, Larry W. Thompson, William R. Grayson
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: Apr 6, 1987
Inventors
Richard A. Meador
Larry W. Thompson
William R. Grayson
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.