Patents by Inventor Fred M. Hufnagel

Fred M. Hufnagel 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).

  • Patent number: 4797934
    Abstract: A speaker headrest is composed of a frame and a concave front surface to support the user's head through a cushion and members flanking the frame and rotatably attached thereto. Speakers contained in these flanking members are pressed against the user's ears when the user's head is moved backward to rest against the frame, thereby pushing lever plates attached to the flanking members backwards and causing the flanking members to rotate around their supporting axes of rotation.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: January 10, 1989
    Inventor: Fred M. Hufnagel