Granted Patent
Utility
US 4,527,425 · App. 06/448,531
System for detecting blow out and lost circulation in a borehole
Inventor:
James G. Stockton
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Dec 10, 1982
Inventor
James G. Stockton
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.