Patents by Inventor Sakuji Fukuda

Sakuji Fukuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Loudspeaker system
    Patent number: 6628799
    Abstract: The outer peripheral site of a loudspeaker unit is provided with predetermined air passages formed along substantially the overall inner perimeter of an opening in a baffle plate for allowing a communication between the interior and the exterior of an enclosure, whereby there is provided a loudspeaker system capable of achieving, e.g., improvements in low-frequency characteristics and in transient characteristics while implementing reductions in size and weight.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: September 30, 2003
    Inventor: Sakuji Fukuda
  • Loudspeaker system
    Patent number: 6504939
    Abstract: The outer peripheral site of a loudspeaker unit is provided with predetermined air passages formed along substantially the overall inner perimeter of an opening in a baffle plate for allowing a communication between the interior and the exterior of an enclosure, whereby there is provided a loudspeaker system capable of achieving, e.g., improvements in low-frequency characteristics and in transient characteristics while implementing reductions in size and weight.
    Type: Grant
    Filed: May 10, 2000
    Date of Patent: January 7, 2003
    Inventor: Sakuji Fukuda
  • Loudspeaker system
    Publication number: 20020136423
    Abstract: The outer peripheral site of a loudspeaker unit is provided with predetermined air passages formed along substantially the overall inner perimeter of an opening in a baffle plate for allowing a communication between the interior and the exterior of an enclosure, whereby there is provided a loudspeaker system capable of achieving, e.g., improvements in low-frequency characteristics and in transient characteristics while implementing reductions in size and weight.
    Type: Application
    Filed: May 23, 2002
    Publication date: September 26, 2002
    Inventor: Sakuji Fukuda