Granted Patent
Utility
US 4,337,920 · App. 06/197,409
Valve
Inventor:
Joe P. Parris
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Oct 16, 1980
Inventor
Joe P. Parris
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.