Granted Patent
Utility
US 4,349,149 · App. 06/167,381
Mixing valve
Inventor:
Jurgen Humpert
Patented Case
View Patent ↗
Granted: Sep 14, 1982
Filed: Jul 9, 1980
Inventor
Jurgen Humpert
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.