Granted Patent
Utility
US 6,722,140 · App. 10/340,652
Cascade cryogenic thermoelectric cooler for cryogenic and room temperature applications
Inventor:
Rama Venkatasubramanian
Patented Case
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Granted: Apr 20, 2004
Filed: Jan 13, 2003
Inventor
Rama Venkatasubramanian
Assignee (at issue)
Research Triangle Institute
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.