Patents by Inventor Muto Keiko

Muto Keiko 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).

  • Patent number: 6687381
    Abstract: A planar loudspeaker is disclosed having a unique multi-layered sound resonator plate. The resonator has an upper layer and a lower layer maintained in a flat spaced-apart relationship. Divider walls or ribs are present to maintain the upper and lower layers spaced-apart, and in a self-taut state with internal chambers. The resonator layers and divider walls establish a plurality of internal passages or chambers that may or may not be sealed. The planar speaker includes a frame assembly having a mount plate and a resonator driver attached to the mount plate. The driver being responsive to an electrical signal and attached to a radiator that is movable in accordance with the movement of the driver. The flat spaced-apart resonator is attached to the radiator and frame, which produces sound when vibrated. The aspect ratio of the planar loudspeaker is preferably at least about 1.3 to 1 or greater.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: February 3, 2004
    Inventors: Mayuki Yanagawa, Muto Keiko
  • Publication number: 20020094108
    Abstract: A planar loudspeaker is disclosed having a unique multi-layered sound resonator plate. The resonator has an upper layer and a lower layer maintained in a flat spaced-apart relationship. Divider walls or ribs are present to maintain the upper and lower layers spaced-apart, and in a self-taut state with internal chambers. The resonator layers and divider walls establish a plurality of internal passages or chambers that may or may not be sealed. The planar speaker includes a frame assembly having a mount plate and a resonator driver attached to the mount plate. The driver being responsive to an electrical signal and attached to a radiator that is movable in accordance with the movement of the driver. The flat spaced-apart resonator is attached to the radiator and frame, which produces sound when vibrated. The aspect ratio of the planar loudspeaker is preferably at least about 1.3 to 1 or greater.
    Type: Application
    Filed: March 7, 2002
    Publication date: July 18, 2002
    Inventors: Mayuki Yanagawa, Muto Keiko