Granted Patent
Utility
US 4,501,408 · App. 06/394,699
Volume control valve
Inventors:
Manfred Pawelzik, Max Derr
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Jul 2, 1982
Inventors
Manfred Pawelzik
Max Derr
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.