Granted Patent
Utility
US 4,421,137 · App. 06/230,378
Plug assembly for sealing a pressure fluid passage in a manifold or the like
Inventors:
Kay T. Nusbaumer, Terrell R. Whitaker
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Feb 2, 1981
Inventors
Kay T. Nusbaumer
Terrell R. Whitaker
Assignee (at issue)
PHD, 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.