Granted Patent
Utility
US 4,415,028 · App. 06/300,087
Apparatus for measuring bottom hole well conditions
Inventor:
Fred E. Watkins
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Sep 8, 1981
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.