Granted Patent
Utility
US 6,401,470 · App. 09/661,477
Expansion device for vapor compression system
Inventor:
David Wightman
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Sep 14, 2000
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.