Granted Patent
Utility
US 4,492,865 · App. 06/345,592
Borehole influx detector and method
Inventors:
Richard D. Murphy, Daniel F. Coope
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Feb 4, 1982
Inventors
Richard D. Murphy
Daniel F. Coope
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.