Patents by Inventor Yukinori Katakawa

Yukinori Katakawa 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 waterproof structure for electrical equipment
    Patent number: 5802192
    Abstract: Outside an electrical equipment housing having a speaker installed therein is installed a vibratory plate member for externally transmitting vibrations of the speaker as a sound and for preventing intrusion of water from outside the housing, and a plurality of sound release holes are formed through the housing, inside the vibratory plate member, for transmitting a sound from the speaker to the vibratory plate member.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: September 1, 1998
    Assignee: NEC Corporation
    Inventor: Yukinori Katakawa