Granted Patent
Utility
US 4,010,642 · App. 05/606,911
Borehole pressure measurement
Inventor:
Billy W. McArthur
Patented Case
View Patent ↗
Granted: Mar 8, 1977
Filed: Aug 22, 1975
Inventor
Billy W. McArthur
Assignee (at issue)
Sperry-Sun, 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.