Granted Patent
Utility
US 6,806,620 · App. 10/048,991
Piezoelectric drive excited by longitudinal and flexural waves
Inventor:
Wladimir Wischnewskiy
Patented Case
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Granted: Oct 19, 2004
Filed: Nov 7, 2002
Inventor
Wladimir Wischnewskiy
Assignee (at issue)
PI CERAMIC GMBH KERAMISCHE TECHNOLOGIEN UND BAUELEMENTE
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.