Patents by Inventor Sven Torild Kruse Johansson

Sven Torild Kruse Johansson 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).

  • Patent number: 4058673
    Abstract: An arrangement for ciphering and deciphering comprises a number of cycle length counters. Each of the counters has a different cycle length and generates a series of bits by scanning associated memory fields containing internal-key-information. The series of bits are combined in a logical unit in order to obtain a ciphered series. The arrangement includes a plurality of memories each comprising a number of memory fields corresponding to the number of counters. Switches are arranged to select internal-key-information by selecting memory fields from different memories depending on a control device, which is operated by certain character combinations in the transmitted text on the sender side and on the receiver side of the system.
    Type: Grant
    Filed: September 24, 1975
    Date of Patent: November 15, 1977
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Sven Torild Kruse Johansson