Granted Patent
Utility
US 6,761,212 · App. 09/866,370
Spiral copper tube and aluminum fin thermosyphon heat exchanger
Inventor:
Frank DiPaolo
Patented Case
View Patent ↗
Granted: Jul 13, 2004
Filed: May 25, 2001
Inventor
Frank DiPaolo
Assignee (at issue)
Liebert Corporation
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.