Granted Patent
Utility
US 4,491,149 · App. 06/520,819
Pressure regulator with over-pressure safety shut-off feature
Inventor:
Joseph C. Trinkwalder, Jr.
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Aug 5, 1983
Inventor
Joseph C. Trinkwalder, Jr.
Assignee (at issue)
Sherwood Selpac Corp.
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.