Granted Patent
Utility
US 6,581,398 · App. 09/902,900
Vapor compression system and method
Inventor:
David Wightman
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Jul 10, 2001
Inventor
David Wightman
Assignee (at issue)
Xdx, 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.