Granted Patent
Utility
US 4,570,480 · App. 06/595,320
Method and apparatus for determining formation pressure
Inventors:
John E. Fontenot, Richard D. Murphy
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Mar 30, 1984
Inventors
John E. Fontenot
Richard D. Murphy
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.