Dynamic loudspeakers operating in air

• "Loudspeaker", Roelof Vermeulen, Canadian Patent CA298695A. 1930
• "Loudspeaking Telephone Set With Low Acoustic Coupling", E. S. Peterson, US Patent 2483231. 1942
• "Telephonic Receiver", R. H. Marriott, US Patent 1500331. 1924. similar to Martenot's "Palme".
• "Sound Reproducing Device", B. E. Mills, US Patent 2297972. 1942. omnidirectional.
• "Microphone", Roelof Vermeulen, US Patent 2421820A. 1943. noise cancelling.
• "Rotatable Tremulant Sound Producer", D. J. Leslie, US Patent 2489653.1949. this is the Leslie speaker.
• "Noise excluding Telephone Receiver", V Gavreau, US Patent 2757247. 1956. Gavreau, of "brown sound" note.
• "Reverberation Loudspeaker", W Rehde, US Patent 3149692. 1964
• "Delay Device Producing Artificial Reverb", B Weingartner et al, US Patent 3402371. 1968. akg
• "Directional Loudspeaker", B. B. Bauer, US Patent 3903989. 1975

Vibration transducers

vibrations imparted directly by contact

• "Announcing System for Ships", L. B. Logsdon, US Patent 2172066. 1939. vibrates hull.
• "Pulsating device", A. Y. Paii, US Patent 2821191. 1958. massage table.
• "Audio Transducer", H Ries, US Patent 3366749. 1968
• "Dynamic Transducer With Wall-mounted Diaphragm", D. E. Thielen, US Patent 4878561. 1969
• "Loudspeaker", [Rolen Diversified Investors], British Patent GB1080829, the first Rolen vibration transducer patent.
• "Sound Transducer With Wall-mounted Diaphragm", Richard E Thurston, US Patent 3524027. 1970. the improved Rolen-Star.
• "Loudspeaker Using Wall as Diaphragm", Robert T Cozart, US Patent 3636281. 1972
• "Dynamic Loudspeaker Using Wall as Diaphragm", Akira Komatsu, US Patent 3728497. 1973.
• "Dynamic Transducer With Wall-mounted Diaphragm", D. E. Thielen, US Patent 4878561. 1969
• "Sound-transmitting Amusement Device and Method", Filo et al, US Patent 5902167. 1999
• "Interactive Entertainment Device", Paul Demarinis, US Patent 6095889. 2000. sound-modulated water jet. beautiful.

• Gilbert Wright - inventor of the Sonovox

  • "Means and Method of Producing Sound Effects", Gilbert M Wright, US Patent 2273077. 1942. the Sonovox.
  • "Means and Method of Producing Sound Effects", Gilbert M Wright, US Patent 2273078. 1942. the Sonovox.
  • "Telegraphy Teaching Method", Gilbert M Wright, Canadian Patent CA420170. 1944. teaching tool using the Sonovox.
  • "Indicating and Signaling Device for Circulatory Systems and the Like"", Gilbert M Wright, US Patent 2854968. 1958
  • "Noiseless Device for Generating Audible Frequencies Including Harmonics", Gilbert M Wright, US Patent 2895126. 1959
  • "Visual Sound Representation", Gilbert M Wright, US Patent 3048075. 1962

• William J Ashworth - Vibration transducers, speakers and reverb devices. see also the Articles section.

  • "Electrical Signal Delay Device", William Ashworth, US Patent 3174121. 1965
  • "Electrical Sound-Reproducing Device", William Ashworth, US Patent 3178512, 1965
  • "Magnetic Speaker Construction", William Ashworth, US Patent 3334195, 1967
  • "Electromagnetic Reproducer", William Ashworth, US Patent 3358084, 1967. a bi-range speaker.
  • "Self-adjusting Relay", William Ashworth, US Patent 3358253, 1967
  • "Loudspeaker Diaphragm and Driver", William Ashworth, US Patent 3366748, 1968
  • "Third Hand Soldering Iron", William Ashworth, US Patent 3383024, 1968
  • "Electromechanical Transducer", William Ashworth, US Patent 3449531, 1969
  • "Loudspeaker with Improved Voice Coil Suspension", William Ashworth, US Patent 3609253, 1971
  • "Transducer Mounting to Soundboard", William Ashworth, US Patent 3925627, 1975
  • "Electromagnetic Speaker with Bucking Coils", William Ashworth, US Patent 4151379, 1979
  • "Multi-diaphragm Reverb Device", William Ashworth, US Patent 4718098, 1988
  • "Method for Attaching Transducer to Stringed Instrument", William Ashworth, US Patent 503150, 1991
  • "Combination Transducer and Loudspeaker", William Ashworth, US Patent 5058173, 1991

Speakers employing the corona effect

• "Electrical Transducer", Siegfried Klein, US Patent 2768246, 1956. audio-to-ultrasonic response employing ionisation "plasma" technique.
• "Sound Emitter", Siegfried Klein, US Patent 4306120, 1981. corona-effect transducer AKA Ionophone.
• "Corona-effect Sound Emitter", Siegfried Klein, US Patent 4464544, 1984.
• "Transducer for the Transformation of Electrical Modulations into Vibratory Modulations" , Siegfried Klein, US Patent 4482788, 1984. another ionophone