Patents by Inventor Donald W. Seiler

Donald W. Seiler 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).

  • Control circuits for electric coding machines
    Patent number: 6175625
    Abstract: The machine involves code wheels in cascade or in a maze with random or mixed circuits which operate a printing device to print the cipher conjugate of the letter on an operated key when the keyboard is connected to one end of the code wheel maze, and to print the plain conjugate of the letter in cipher when a key bearing such letter is operated with the keyboard connected to the other end of the code wheel maze. The printer is connected to the end of the code wheel maze opposite the end to which the keyboard is connected in both cases.
    Type: Grant
    Filed: December 15, 1944
    Date of Patent: January 16, 2001
    Assignee: The United States of America as represented by the National Security Agency
    Inventors: Laurance F. Safford, Donald W. Seiler
  • Electro-mechanical cipher machine
    Patent number: 4143978
    Abstract: 2.
    Type: Grant
    Filed: May 4, 1938
    Date of Patent: March 13, 1979
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Bern Anderson, Donald W. Seiler