Granted Patent
Utility
US 4,489,916 · App. 06/366,367
Valve and stem seal therefor
Inventor:
Russell Stevens
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Apr 7, 1982
Inventor
Russell Stevens
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.