Granted Patent
Utility
US 5,693,917 · App. 08/610,974
Planar diaphragm loudspeaker
Inventors:
Alejandro Bertagni, Eduardo Bertagni, James Schuessler, Alfredo D. Ferrin
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Mar 1, 1996
Inventors
Alejandro Bertagni
Eduardo Bertagni
James Schuessler
Alfredo D. Ferrin
Assignee (at issue)
Sound Advance Systems, Inc.
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.