Granted Patent
Utility
US 3,976,130 · App. 05/601,694
Packing means for a wellhead assembly
Inventors:
Joe G. Chambless, John W. Freeman
Patented Case
View Patent ↗
Granted: Aug 24, 1976
Filed: Aug 1, 1975
Inventors
Joe G. Chambless
John W. Freeman
Assignee (at issue)
ACF Industries Incorporated
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.