Granted Patent
Utility
US 5,991,424 · App. 08/959,289
Planar diaphragm speaker with heat dissipator
Inventors:
Alejandro Bertagni, Eduardo Bertagni
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Oct 24, 1997
Inventors
Alejandro Bertagni
Eduardo Bertagni
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.