Existing US Patents (Obtained from Patent Library Archives, Philadelphia, PA).
- 2,768,246. Klein, 1946
- 3,476,887. Seligson, Ionic Electro-Acoustic Transducer, 11/1969
- 3,516,286. Babcock and Cattaneo, Method and Apparatus for
Generating an Acoustic Output from an Ionized Gas Stream, 6/1970
- 4,306,120. Klein, Sound Emitter, 12/1981
- 4,464,544. Klein, Corona-Effect Sound Emitter, 8/1984
- 4,482,788. Klein, Transducer for the Transformation of Electrical
Modulations into Vibratory Modulations, 11/1984
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