Granted Patent
Utility
US 6,164,622 · App. 09/425,831
Compact expanding gate valve
Inventor:
Charles C. Partridge
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Oct 22, 1999
Inventor
Charles C. Partridge
Assignee (at issue)
Daniel Valve Company, 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.