Granted Patent
Utility
US 4,331,176 · App. 06/126,938
Replaceable cartridge valve assembly
Inventor:
Richard G. Parkison
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Mar 3, 1980
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.