Patents by Inventor Keiko Tamamizu

Keiko Tamamizu 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).

  • Communication system capable of preventing dropout of data block
    Patent number: 5621725
    Abstract: In a data communication system, even when cycle start data or a communication start signal of a communication cycle is not received, data blocks corresponding to that communication cycle can still be transmitted by effectively utilizing the frequency band. In the data communication system, space for at least one additional data block is allocated to every communication cycle such that the number of data blocks transmittable in a communication cycle is greater than the total number of data blocks received in that cycle, and the data blocks are transmitted in first-in-first-out order as a packet following the communication start signal.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: April 15, 1997
    Assignee: Sony Corporation
    Inventors: Harumi Kawamura, Hisato Shima, Keiko Tamamizu