Granted Patent
Utility
US 5,953,414 · App. 08/966,978
Piezo-electric speaker capsule for telephone handset
Inventors:
Denis Abraham, Stephane Dufosse
Patented Case
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Granted: Sep 14, 1999
Filed: Nov 10, 1997
Inventors
Denis Abraham
Stephane Dufosse
Assignee (at issue)
ALCATEL
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.