Granted Patent
Utility
US 4,536,713 · App. 06/471,879
Electrical resistivity measurement of a flowing drilling fluid using eddy currents generated therein
Inventors:
Mark H. Davis, Richard A. Meador, Macmillan M. Wisler
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Mar 3, 1983
Inventors
Mark H. Davis
Richard A. Meador
Macmillan M. Wisler
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.