Granted Patent
Utility
US 6,173,744 · App. 09/271,381
Piezoelectric valve
Inventors:
Herbert Frisch, Hannes Wirtl, Günther Strasser
Patented Case
View Patent ↗
Granted: Jan 16, 2001
Filed: Mar 18, 1999
Inventors
Herbert Frisch
Hannes Wirtl
Günther Strasser
Assignee (at issue)
Hygrama 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.