Patents by Inventor Mutsufumi Fujii

Mutsufumi Fujii 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).

  • Speaker
    Patent number: 6341167
    Abstract: A speaker comprising a magnetic circuit containing at least a magnetic gap, a frame connected to the magnetic circuit, and an integral unit consisting of a ring shaped voice coil bobbin unit which is wound around with coil to be coupled in the magnetic gap, and a diaphragm unit formed in the shape of an inverse letter “U” disposed on an upper edge of the voice coil bobbin unit. This speaker provides enhanced rigidity, a reduction in production/assembly cost, and an improved sound pressure level.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: January 22, 2002
    Assignee: Matsushita Electric Industrial Co., Inc.
    Inventors: Masatoshi Okuyama, Masahide Sumiyama, Kazurou Okuzawa, Mutsufumi Fujii