Granted Patent
Utility
US 4,856,556 · App. 07/272,532
Water mixing valve, especially for a sanitary fixture
Inventor:
Kurt Mennigmann
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Nov 16, 1988
Inventor
Kurt Mennigmann
Assignee (at issue)
Friedrich Grohe Armaturenfabrik GmbH & Co.
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.