Granted Patent
Utility
US 6,557,358 · App. 10/015,776
Non-hydrocarbon ultra-low temperature system for a refrigeration system
Inventors:
Chuan Weng, Allan Kelly
Patented Case
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Granted: May 6, 2003
Filed: Dec 17, 2001
Inventors
Chuan Weng
Allan Kelly
Assignee (at issue)
Kendro Laboratory Products, 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.