Granted Patent
Utility
US 5,651,504 · App. 08/490,723
Vented backflow preventer for hose-type faucet
Inventors:
Frank-Thomas Luig, Roland Weiss
Patented Case
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Granted: Jul 29, 1997
Filed: Jun 15, 1995
Inventors
Frank-Thomas Luig
Roland Weiss
Assignee (at issue)
Friedrich Grohe AG
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.