Patents by Inventor Burkhard Ballein

Burkhard Ballein 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).

  • Headphones
    Patent number: 5579400
    Abstract: Headphones with two receivers, which can be inserted, each preferably surrounded by a foam pad, into the two auricles of the user and fixed with a hoop, and the hoop, which fixes the two receivers in the auricles of the user, is formed by spectacles, the two receivers being fixed to the free ends of the side pieces and the free ends of the side pieces running essentially in a straight line to the center of the auricles.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: November 26, 1996
    Inventor: Burkhard Ballein