Granted Patent
Utility
US 5,022,631 · App. 07/599,707
Flow-control and shutofff valve
Inventors:
Friedrich Wagner, Walter Grau
Patented Case
View Patent ↗
Granted: Jun 11, 1991
Filed: Oct 18, 1990
Inventors
Friedrich Wagner
Walter Grau
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.