Patents on flat panel speakers


Patent number Description Filed / Granted Available
U.S. Patent No. 3,919,499 J.M. Winey, "Planar Speaker" 1975 November  
U.S. Patent No. 4,156,801 R.C. Whelan and C.J. Sealey, "Pattern Voice Coil Loudspeaker with Baffles Touching Diaphragm" 1979 May  
U.S. Patent No. 4,210,786 . J.M. Winey, "Magnetic Field Structure for Planar Speaker" 1980 July  
U.S. Patent No. 4,273,968, H. Suyama, "Electroacoustic Transducer with Magnetic Flux Directly Slantly across a Diaphragm" 1981 June  
U.S. Patent No. 4,413,160 T. Ohyaba and Y. Suzuki, "Ribbon-Type Loudspeaker" 1983 November  
U.S. Patent No. 4,471,172 J.M. Winey, "Planar Diaphragm Transducer with Improved Magnetic Circuit" 1984 September  
U.S. Patent No. 4,471,173 J.M. Winey, "Piston-Diaphragm Speaker" 1984 September  
U.S. Patent No. 4,480,155 J.M. Winey, "Diaphragm Type Magnetic Transducer" 1984 October  
U.S. Patent No. 4,484,037 J.A.M. Niewendijk and W.D.A.M. van Gijsel, "Ribbon-Type Electro-Acoustic Transducer with Low Distortion and Improved Sensitivity" 1984 November  
U.S. Patent No. 4,544,806 J.A.M. Niewendijk, W.D.A.M. van Gijsel, and G.B.J. Sanders, "Ribbon-Type Transducer with a Multi-Layer Diaphragm" 1985 October  
U.S. Patent No. 4,723,296, J.A.M. Niewendijk, G.B.J. Sanders, and J.W.T. Bax, "Electrodynamic Transducer of the Isophase or Ribbon Type" 1988 February  
U.S. Patent No. 4,803,733 R.W. Carver and J.J. Croft, "Loudspeaker Diagphragm Mounting System and Method" 1989 February  
U.S. Patent No. 4,837,838 F.B. Thigpen and D.E. Collie, "Electromagnetic Transducer of Improved Efficency" 1989 June  
U.S. Patent No. 5,430,805 C. Stevenson and A.E. Perrazzo, "Planar Electromagnetic Transducer", 1995 July  



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