Granted Patent
Utility
US 4,941,506 · App. 07/335,081
Sanitary mixing valve
Inventor:
Konrad Bergmann
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Apr 7, 1989
Inventor
Konrad Bergmann
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.