Granted Patent
Utility
US 4,353,560 · App. 06/328,053
Metal seal assembly with deformable sealing ring
Inventor:
Henry O. Tohill
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Dec 7, 1981
Inventor
Henry O. Tohill
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.