Granted Patent
Utility
US 4,621,659 · App. 06/824,623
Mixing valve
Inventor:
Manfred Pawelzik
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Jan 31, 1986
Inventor
Manfred Pawelzik
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.