Granted Patent
Utility
US 4,630,680 · App. 06/712,907
Well control method and apparatus
Inventor:
Hubert L. Elkins
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Mar 15, 1985
Inventor
Hubert L. Elkins
Assignee (at issue)
Hydril Company
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.