Granted Patent
Utility
US 4,159,643 · App. 05/929,154
Method of and apparatus for measuring bottom hole well pressure
Inventor:
Fred E. Watkins
Patented Case
View Patent ↗
Granted: Jul 3, 1979
Filed: Jul 31, 1978
Inventor
Fred E. Watkins
Assignee (at issue)
Camco 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.