Granted Patent
Utility
US 4,625,173 · App. 06/595,251
System for monitoring formation spontaneous potential and polarization constant while drilling
Inventors:
Macmillan M. Wisler, James R. Birchak, Richard A. Meador
Patented Case
View Patent ↗
Granted: Nov 25, 1986
Filed: Mar 30, 1984
Inventors
Macmillan M. Wisler
James R. Birchak
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.