Granted Patent
Utility
US 6,041,621 · App. 09/222,813
Single circuit cryogenic liquefaction of industrial gas
Inventors:
Walter Joseph Olszewski, Bayram Arman, Joseph Alfred Weber, Arun Acharya
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Dec 30, 1998
Inventors
Walter Joseph Olszewski
Bayram Arman
Joseph Alfred Weber
Arun Acharya
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.