Granted Patent
Utility
US 5,499,648 · App. 08/297,802
Sealing means for pressure relief valves and methods of assembly
Inventors:
Walter W. Powell, Louis R. Castaneda
Patented Case
View Patent ↗
Granted: Mar 19, 1996
Filed: Aug 30, 1994
Inventors
Walter W. Powell
Louis R. Castaneda
Assignee (at issue)
Groth LLC
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.