Patents Represented by Law Firm Nikaido, Marmelstin, Murray & Oram
  • Speaker system
    Patent number: 5333204
    Abstract: A speaker system has a bass-reflex duct provided in a cabinet. A sub-duct is provided on a central portion of the bass-reflex duct. The sub-duct is communicated with the bass-reflex duct, and filled with sound absorbing material for absorbing unnecessary resonance generated in the bass-reflex duct.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: July 26, 1994
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroyuki Hamada, Takahiro Naka