Patents on plasma loudspeakers


Patent number Description Filed / Granted Available
US Patent 2.793.324 Halus and Holcomb Ionic triod speaker ...
May 21, 1957
U.S. Patent 3,018,394
(PDF, 530 KB, Available on exchange basis)
Thomas Townsend Brown, Santa Monica, California. generation and transmission of pressure waves from an electric corona; discharge to the ambient air. (Don gregorka, April 2001) ...
July 12, 1967
Available on exchange basis
US Patent 3.476.887 Sellingson Ionic electroacoustic transducer ...
November 04, 1969
Preliminary Patent Application
(PDF, 12 KB)
Thomas Townsend Brown, Menlo Park, Calif. A device by which electrical signals are converted into high fidelity sound without the use of a moving cone or diaphragm and without (concurrently) producing a flow of air. (Don gregorka, April 2001) December 7, 1969
Available on exchange basis
BRD Patentamt n 2115544 Walter Koronaphon ...
October 5, 1972
Europe Patent Ammeldung 0 017886 Klein S. Electroakustischer Wandler ...
October 29, 1980



US Patent & trademark Office

The IBM patent server