Granted Patent
Utility
US 6,499,313 · App. 09/950,810
Process and apparatus for generating high-purity nitrogen by low-temperature fractionation of air
Inventors:
Ralph Spoeri, Stefan Lochner
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Sep 13, 2001
Inventors
Ralph Spoeri
Stefan Lochner
Assignee (at issue)
Linde GmbH
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.