Granted Patent
Utility
US 6,041,620 · App. 09/222,814
Cryogenic industrial gas liquefaction with hybrid refrigeration generation
Inventors:
Walter Joseph Olszewski, Bayram Arman, Arun Acharya, Joseph Alfred Weber, Mohammad Abdul-Aziz Rashad
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Dec 30, 1998
Inventors
Walter Joseph Olszewski
Bayram Arman
Arun Acharya
Joseph Alfred Weber
Mohammad Abdul-Aziz Rashad
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.