Patents by Inventor Willard C. Unkenholz

Willard C. Unkenholz 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).

  • Apparatus for simultaneous generation of key at two locations
    Patent number: 4429180
    Abstract: An apparatus for simultaneously generating identical cipher key at two remote terminals in a manner which prohibits interception of the key by unauthorized persons. A circuit comprising three separate wire lines is connected between the two terminals over geographically separated routes. The circuit is randomly completed and broken by a switch at each terminal, the switch position being determined at each terminal by an independent key generator. Cipher key is communicated by comparing the key generator output and the circuit condition.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: January 31, 1984
    Assignee: The United States of America as represented by the Director of the National Security Agency
    Inventor: Willard C. Unkenholz