Patents by Inventor Tsutomu Shiomitsu

Tsutomu Shiomitsu 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).

  • Maintenance communication control system in an ISDN service
    Patent number: 5375117
    Abstract: A maintenance link is established according to a LAPD between first and second terminal units on a path through which subscribers' packet information is transmitted. In the first and second terminal units, first and second communication state control units are provided for controlling the consistency of the communication state between the two terminal units by sending/receiving communication state control information using the maintenance link.
    Type: Grant
    Filed: October 27, 1993
    Date of Patent: December 20, 1994
    Assignee: Fujitsu Limited
    Inventors: Sumie Morita, Takashi Hatano, Ryouzi Takano, Hisashi Koga, Tsutomu Shiomitsu
  • ISDN D channel congestion control method
    Patent number: 5283788
    Abstract: An ISDN D channel congestion control method has at least either a digital subscriber line circuit common (DLCC) or a signaling controller (SGC) notify either an SGC or a packet subscriber system (PSS) of a D channel congestion according to a predetermined protocol, thereby controlling the congestion of a communication controlling apparatus.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: February 1, 1994
    Assignee: Fujitsu Limited
    Inventors: Sumie Morita, Takashi Hatano, Masako Shinmura, Hisashi Koga, Tsutomu Shiomitsu