Patents by Inventor Abraham Hirschberg

Abraham Hirschberg 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).

  • Loudspeaker system having a bass-reflex port
    Patent number: 6275597
    Abstract: A loudspeaker system comprises an enclosure which accommodates a loudspeaker device and a bass-reflex port (105). The port has two open ends (105b, 105c) and a central area (c) provided with perforations (109), as well as a foam material (111) provided in and/or on the perforations.
    Type: Grant
    Filed: May 24, 1999
    Date of Patent: August 14, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Nicolaas B. Roozen, Abraham Hirschberg, Pascas Van Eck