Granted Patent
Utility
US 4,820,409 · App. 07/183,144
Plastic pressure relief valve assembly
Inventors:
John Lowsky, Jr., Scott Trierwiler, Nicholas Torchia
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Apr 19, 1988
Inventors
John Lowsky, Jr.
Scott Trierwiler
Nicholas Torchia
Assignee (at issue)
Facet Enterprises, Incorporated
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.