Patents by Inventor John H. M. van Breemen

John H. M. van Breemen 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).

  • Method and apparatus for combined encryption and scrambling of information on a shared medium network
    Patent number: 5473696
    Abstract: An improved method and apparatus for encrypting and scrambling information cells transmitted on a telephone system local loop from a central office to a plurality of user premises networks via a shared medium passive optical network. Prior to transmission, the information cell is encrypted for security purposes and scrambled to improve its transmission properties by modulo 2 addition of the information cell and a combined encryption and scrambling sum pattern. At the other end of the passive optical network which is connected to user premises networks, the received encrypted and scrambled information cells are used to generate a processed cell by the modulo 2 addition of the received cell and a combined decryption and descramble sum pattern.
    Type: Grant
    Filed: November 5, 1993
    Date of Patent: December 5, 1995
    Assignee: AT&T Corp.
    Inventors: John H. M. van Breemen, Robert J. M. Verbeek