Granted Patent
Utility
US 4,710,906 · App. 06/891,773
Method and system for monitoring the stability of boreholes
Inventors:
William Bradley, Philip W. Holbrook
Patented Case
View Patent ↗
Granted: Dec 1, 1987
Filed: Jul 30, 1986
Inventors
William Bradley
Philip W. Holbrook
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.