Granted Patent
Utility
US 6,301,929 · App. 09/452,167
Process and apparatus for producing pressurized oxygen and krypton/xenon by low-temperature fractionation of air
Inventor:
Stefan Lochner
Patented Case
View Patent ↗
Granted: Oct 16, 2001
Filed: Dec 1, 1999
Inventor
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.