Granted Patent
Utility
US 4,353,420 · App. 06/202,594
Wellhead apparatus and method of running same
Inventor:
Henry W. Miller
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Oct 31, 1980
Inventor
Henry W. Miller
Assignee (at issue)
Cameron Iron Works, 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.