Granted Patent
Utility
US 5,425,107 · App. 07/866,067
Planar-type loudspeaker with dual density diaphragm
Inventors:
Alejandro Bertagni, Eduardo Bertagni, Alfredo D. Ferrin
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Apr 9, 1992
Inventors
Alejandro Bertagni
Eduardo Bertagni
Alfredo D. Ferrin
Assignee (at issue)
Bertagni Electronic Sound Transducers, International Corporation
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.