Granted Patent
Utility
US 4,278,278 · App. 06/071,213
Means for tensioning tubing in a wellhead assembly
Inventors:
Joe G. Chambless, Paul E. McGlasson
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Aug 30, 1979
Inventors
Joe G. Chambless
Paul E. McGlasson
Assignee (at issue)
W-K-M Wellhead Systems, 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.