Patents by Inventor Joseph A. Kersey

Joseph A. Kersey 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).

  • Secure communication system having long-term keying variable
    Patent number: 5428686
    Abstract: A secure communication apparatus incorporates a longterm, non-extractable master key variable which is held in common by all terminals. A pseudorandom bit sequence generator within the transmitter provides a binary bit stream which is transmitted unencrypted to the intended receiver. Both terminals simultaneously mix the master variable with the transmitted pseudorandom bit stream in an identical manner to create a common separate working variable which is subsequently used for data encryption and decryption.
    Type: Grant
    Filed: September 28, 1981
    Date of Patent: June 27, 1995
    Assignee: The United States of America as represented by the Direrctor of the National Security Agency
    Inventors: Carl D. Brown, Robert T. Kearns, Joseph A. Kersey
  • Checker and automatic synchronizer for coding equipment
    Patent number: 4172963
    Abstract: 1.
    Type: Grant
    Filed: November 20, 1961
    Date of Patent: October 30, 1979
    Assignee: ACF Industries, Incorporated
    Inventors: Harold P. Belcher, William G. Burke, Jr., Joseph A. Kersey