Granted Patent
Utility
US 4,381,114 · App. 06/324,125
Packoff and seal ring assembly with injected plastic packing
Inventor:
Delbert Edwin Vanderford
Patented Case
View Patent ↗
Granted: Apr 26, 1983
Filed: Nov 23, 1981
Inventor
Delbert Edwin Vanderford
Assignee (at issue)
Cameron Iron Works, 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.