Granted Patent
Utility
US 4,390,063 · App. 06/265,310
Geothermal wellhead packing assembly
Inventor:
Frederic D. Wells, Jr.
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: May 20, 1981
Inventor
Frederic D. Wells, Jr.
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.