Patents by Inventor Kazumi Honma

Kazumi Honma 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 system
    Patent number: 5432860
    Abstract: A speaker system includes an acoustic horn disposed in a cabinet. The acoustic horn is cone-shaped, is composed of a porous sound absorbing material, and has an aperture for interconnecting a space at the rear of a speaker unit and a space in the acoustic horn. A sound absorbing member or a passive radiator is disposed at the aperture.
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: July 11, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Syoji Kasajima, Noboru Kyouno, Kazumi Honma, Isao Otsuka