Granted Patent
Utility
US 6,185,958 · App. 09/431,830
Vapor compression system and method
Inventor:
David Wightman
Patented Case
View Patent ↗
Granted: Feb 13, 2001
Filed: Nov 2, 1999
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.