Granted Patent
Utility
US 4,373,398 · App. 06/230,447
Indicating gauge with pressure relief valve
Inventor:
George M. Ponczek
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Feb 2, 1981
Inventor
George M. Ponczek
Assignee (at issue)
Stewart Warner Corporation
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.