Granted Patent
Utility
US 4,243,063 · App. 06/075,619
Mixing valve
Inventor:
Richard G. Parkison
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Sep 14, 1979
Inventor
Richard G. Parkison
Assignee (at issue)
American Standard 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.