Granted Patent
Utility
US 6,425,263 · App. 09/643,420
Apparatus and process for the refrigeration, liquefaction and separation of gases with varying levels of purity
Inventors:
Dennis N. Bingham, Bruce M. Wilding, Michael G. McKellar
Patented Case
View Patent ↗
Granted: Jul 30, 2002
Filed: Aug 23, 2001
Inventors
Dennis N. Bingham
Bruce M. Wilding
Michael G. McKellar
Assignee (at issue)
Department of Energy
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.