Granted Patent
Utility
US 6,598,423 · App. 10/046,665
Sacrificial cryogen gas liquefaction system
Inventors:
Claus Emmer, Thomas K. Drube
Patented Case
View Patent ↗
Granted: Jul 29, 2003
Filed: Jan 22, 2002
Inventors
Claus Emmer
Thomas K. Drube
Assignee (at issue)
Chart 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.