Granted Patent
Utility
US 5,572,875 · App. 08/234,129
Relief valve construction to minimize ignition hazard from cryogenic storage tanks containing volatile liquids
Inventor:
Keith Gustafson
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Apr 28, 1994
Inventor
Keith Gustafson
Assignee (at issue)
Minnesota Valley Engineering, 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.