Patents by Inventor Fumio Mano

Fumio Mano 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 equipment and secure transmission system
    Patent number: 5204903
    Abstract: In a secure transmission system in which first and second pieces of communication equipment are interconnected via a transmission line, the first communication equipment has a conversion part for encrypting an information signal to be transmitted, through utilization of a received signal and the second communication equipment has an information memory for storing, as a key information, information to be transmitted to the first communication equipment and an inverse conversion part in which the encrypted signal received from the first communication equipment is decoded using the key information read out of the information memory. As the transmission information signal varies, the key information also varies accordingly. Hence, a highly secure transmission system and secure communication equipment can be realized.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: April 20, 1993
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kenji Okada, Fumio Mano, Nobuyuki Tokura, Kiyomi Kumozaki, Noriki Miki