Patents by Inventor Willis L. Donaldson

Willis L. Donaldson 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).

  • Teletype mixer apparatus for coding and decoding
    Patent number: 4192967
    Abstract: Apparatus for terminating teletype signal lines and mixing cryptographic teletype signals to furnish an enciphered teletype signal including a secondary operating mode of the mixer unit to retransmit the incoming teletype signal in the event enciphering or deciphering is not required.
    Type: Grant
    Filed: May 26, 1966
    Date of Patent: March 11, 1980
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Martin J. Prucha, Willis L. Donaldson, Douglas N. Travers