Granted Patent
Utility
US 4,444,220 · App. 06/335,250
High pressure valve
Inventor:
Fritz O. Seger
Patented Case
View Patent ↗
Granted: Apr 24, 1984
Filed: Dec 28, 1981
Inventor
Fritz O. Seger
Assignee (at issue)
Willis Division of Smith International, 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.