Patents on ribbon loudspeakers

Patents

Patent number

Description

Filed / Granted Available
U.S. Patent 1,557,356 E. Gerlach, '¯Electrodynamic Loud Speaking Apparatus'¯ 1925 October  
U.S. Patent 3,564,163 G.L. Hobrough and R.L. Wathams, '¯Ribbon Loudspeaker'¯ 1971, February  
U.S. Patent 3.919.499 James Winey of White Bear Lake, Minnesota, USA Jan. 11. 1974
Nov. 11, 1975
Available on exchange basis
U.S. Patent 3.995.228 Nelson Pass    
U.S. Patent 4,001,522 A.F. Kasatkin and A. Feldman, '¯Ribbon Type Loudspeaker'¯ 1977, February  
U.S. Patent 4,001,523 A.F. Kasatkin, J.V. Smirnov, and I.A. Feldman, '¯Ribbon Loudspeaker'¯ 1977, February  
U.S. Patent 4,027,111 A.F. Kasatkin, J.V. Smirnov, and I.A. Feldman, '¯Ribbon Loudspeaker'¯
1977, May
 
U.S. Patent 4,049,926 A.F.Kasatkin, J.V. Smirnov, and I.A. Feldman, '¯Ribbon Loudspeaker Achieves Focusing and Uniformity of the Magnetic Flux in the Working Gap 1977 September  
U.S. Patent 4,085,299 G.L. Hobrough, '¯Peak Amplitude Protection System for Ribbon Louds U.S. Patent 4.107.619 1978 April  
U.S. Patent 4.210.786 James Winey Jan. 24 1979
Jul. 1, 1980
Available on exchange basis
U.S. Patent 4.319.096 J.M. Winey, '¯Line Radiator Ribbon Loudspeaker Mar. 13, 1980
Mar. 9, 1982
Available on exchange basis
U.S. Patent 4,317,966 C.R.B. Lister, '¯Vibratory Ribbon Speaker'¯ 1982 May  
U.S. Patent 4,395,592
T.P. Colangelo, '¯Ribbon Loudspeaker 1983 July  
U.S. Patent 4,461,932 T. Oyaha, '¯Ribbon Type Speaker and Method of Assembling Magnetic Circuit Thereof 1984 July  
U.S. Patent 4.471.172 James Winey Mar. 1, 1982
Sep. 11, 1984
Available on exchange basis
U.S. Patent 4.471.173 James Winey Mar. 1, 1982
Sep. 11, 1984
Available on exchange basis
U.S. Patent 4,473,723 G.L. Hobrough, '¯Ribbon Loudspeaker having Corrugated Ribbon for Reducing Distortion 1984 September  

U.S. Patent 4.480.155

James Winey Mar. 1, 1982
Oct. 30, 1984
Available on exchange basis
U.S. Patent 4,550,228 G.E. Walker, L. Spiegel, A.J. Shuman, and J.L. Kirtley, Jr., '¯Ribbon Speaker System,'¯ 1985 October  
U.S. Patent 4,580,014 T.B. Hobrough, '¯Means for Controlling Ribbon Edge Clearance in a Ribbon Loudspeaker 1986 April  
U.S. Patent 4.752.745 Nelson Pass    
U.S. Patent 4,912,086 U.R. Enz, A.A. Cornberg, and N.E.F. Hansen, '¯Electroacoustic Transducer comprizing a Superconducting Element,'¯ 1990 March  
U.S. Patent 5,148,888 G. Bank and H.C. Pinfold, '¯Ribbon Transducers,'¯ 1992 September  
U.S. Patent 5,195,143 L. Spiegel and M.B. Nazar, '¯Acoustical Ribbon Transducer Loudspeaker System,'¯
1993 March
 
U.S. Patent 5,212,735 A.F. Kasatkin and I.A. Feldman, '¯Wide-Ribbon Loudspeaker,'¯ 1993 May  
U.S. Patent 5,212,736 T.T. Saitama, '¯Ribbon Speaker,'¯ 1993 May  
U.S. Patent 5,243,150 G. Bank and H.C. Pinfold, '¯Ribbon Transducers,'¯ 1993 September  
U.S. Patent 5.343.166 Nelson Pass    
U.S. Patent 5.376.899 Nelson Pass    
U.S. Patent 5.710.522 Nelson Pass    

We are not sure about the patents below are really ribbon related. please let us know if you can provide additional information

Patent number

Description

Filed / Granted Available
4228327 Electromagnetic type acoustic transducers
Inventor(s): Sawafuji; Tadashi, Toshima-ku, Tokyo, Japan
   
4276449 Speaker or microphone having corrugated diaphragm with conductors thereon
Inventor(s): Sawafuji; Tadashi, Toshima-ku, Tokyo, Japan
   
4544805 Plane speaker
Inventor(s): Sawafuji; Tadashi, Toshima-ku, Tokyo, Japan
   
4597099 Piezoelectric transducer
Inventor(s): Sawafuji; Tadashi, Toshima-ku, Tokyo, Japan
   
4654554 Piezoelectric vibrating elements and piezoelectric electroacoustic transducers
Inventor(s): Kishi; Kanesuke, Kanagawa, Japan Sawafuji Dynameca Co., Ltd., Japan
   

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