Granted Patent
Utility
US 5,174,497 · App. 07/818,768
Cryogenic pilot valve
Inventor:
Norman Henry White
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Jan 13, 1992
Inventor
Norman Henry White
Assignee (at issue)
Praxair Technology, 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.