Granted Patent
Utility
US 6,581,638 · App. 09/989,485
Piezo valve
Inventors:
Herbert Frisch, Hannes Wirtl, Michael Weinmann, Martin Maichl
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Nov 20, 2001
Inventors
Herbert Frisch
Hannes Wirtl
Michael Weinmann
Martin Maichl
Assignee (at issue)
FESTO AG & 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.