Patents by Inventor Heinrich Kallhardt

Heinrich Kallhardt 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).

  • Electrostatic discharge protection device
    Patent number: 4868876
    Abstract: An electrically conductive network which, at one end, has a low-resistance connection with a user's hand and, at the other end, has a high-resistance connection with ground. This protects electrical equipment such as a telephone keyset from electrostatic discharge and also protects the user from unpleasantly high discharge currents.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: September 19, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Kurt Schiller, Johann Luger, Hans Schierl, Heinrich Kallhardt