Granted Patent
Utility
US 4,274,486 · App. 06/094,941
Apparatus for and method of operating a well
Inventor:
John V. Fredd
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Nov 16, 1979
Inventor
John V. Fredd
Assignee (at issue)
Otis Engineering Corporation
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.