Granted Patent
Utility
US 4,202,410 · App. 06/015,990
Seal testing arrangement for wellheads
Inventor:
Herbert O. Quebe
Patented Case
View Patent ↗
Granted: May 13, 1980
Filed: Feb 28, 1979
Inventor
Herbert O. Quebe
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.