Granted Patent
Utility
US 5,012,867 · App. 07/509,179
Well flow control system
Inventor:
Marion D. Kilgore
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: Apr 16, 1990
Inventor
Marion D. Kilgore
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.