Patents by Inventor Takahiro Murooka

Takahiro Murooka 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).

  • Multicast data communication method, multicast data communication system, repeater, repeating method, and medium for storing repeating programs
    Patent number: 7986641
    Abstract: A multicast data communication system is provided that has high security, and prevents problems such as an attack by a malicious user creating a great number of meaningless tables at nodes in the network. Clients regularly transmit request packets toward a server; a node receives the request packet, and subsequently receives a delivery-table-creation packet or a delivery packet from the server; if the node has no delivery table corresponding to the server, the node creates the delivery table, registers the addresses of the clients, and their request packet arrival times, and regularly transmits the request packet toward the server; when the node has received a delivery packet from the server, the node duplicates and delivers the delivery packet only to those clients whose request packet arrival times, registered in the delivery table, are within a fixed period from the arrival of the delivery packet.
    Type: Grant
    Filed: September 10, 2007
    Date of Patent: July 26, 2011
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Seiichiro Tani, Toshiaki Miyazaki, Noriyuki Takahashi, Takahiro Murooka, Shinya Ishihara, Takeru Inoue
  • MULTICAST DATA COMMUNICATION METHOD, MULTICAST DATA COMMUNICATION SYSTEM, REPEATER, REPEATING METHOD, AND MEDIUM FOR STORING REPEATING PROGRAMS
    Publication number: 20080069099
    Abstract: A multicast data communication system is provided that has high security, and prevents problems such as an attack by a malicious user creating a great number of meaningless tables at nodes in the network. Clients regularly transmit request packets toward a server; a node receives the request packet, and subsequently receives a delivery-table-creation packet or a delivery packet from the server; if the node has no delivery table corresponding to the server, the node creates the delivery table, registers the addresses of the clients, and their request packet arrival times, and regularly transmits the request packet toward the server; when the node has received a delivery packet from the server, the node duplicates and delivers the delivery packet only to those clients whose request packet arrival times, registered in the delivery table, are within a fixed period from the arrival of the delivery packet.
    Type: Application
    Filed: September 10, 2007
    Publication date: March 20, 2008
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventors: Seiichiro Tani, Toshiaki Miyazaki, Noriyuki Takahashi, Takahiro Murooka, Shinya Ishihara, Takeru Inoue
  • Traffic quality measurement apparatus and method
    Patent number: 7330434
    Abstract: A measurement apparatus for measuring traffic of packets with high time resolution is provided. The measurement apparatus includes an accumulation part for accumulating packet lengths of packets having predetermined header information in successively received packets, and storing an accumulated value of the packet lengths in a storage; and a periodic reading part for reading the accumulated value from the storage at predetermined time intervals, and outputting the accumulated value.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: February 12, 2008
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takahiro Murooka, Masashi Hashimoto, Toshiaki Miyazaki
  • Multicast data communication method, multicast data communication system, repeater, repeating method, and medium for storing repeating programs
    Patent number: 7313596
    Abstract: A multicast data communication system is provided that has high security, and prevents problems such as an attack by a malicious user creating a great number of meaningless tables at nodes in the network. Clients regularly transmit request packets toward a server; a node receives the request packet, and subsequently receives a delivery-table-creation packet or a delivery packet from the server; if the node has no delivery table corresponding to the server, the node creates the delivery table, registers the addresses of the clients, and their request packet arrival times, and regularly transmits the request packet toward the server; when the node has received a delivery packet from the server, the node duplicates and delivers the delivery packet only to those clients whose request packet arrival times, registered in the delivery table, are within a fixed period from the arrival of the delivery packet.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: December 25, 2007
    Assignee: Nippon Telegraph & Telephone Corporation
    Inventors: Seiichiro Tani, Toshiaki Miyazaki, Noriyuki Takahashi, Takahiro Murooka, Shinya Ishihara, Takeru Inoue
  • Traffic quality measurement apparatus and method
    Publication number: 20030202471
    Abstract: A measurement apparatus for measuring traffic of packets with high time resolution is provided. The measurement apparatus includes an accumulation part for accumulating packet lengths of packets having predetermined header information in successively received packets, and storing an accumulated value of the packet lengths in a storage; and a periodic reading part for reading the accumulated value from the storage at predetermined time intervals, and outputting the accumulated value.
    Type: Application
    Filed: April 29, 2003
    Publication date: October 30, 2003
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takahiro Murooka, Masashi Hashimoto, Toshiaki Miyazaki
  • Multicast data communication method, multicast data communication system, repeater, repeating method, and medium for storing repeating programs
    Publication number: 20020169833
    Abstract: A multicast data communication system is provided that has high security, and prevents problems such as an attack by a malicious user creating a great number of meaningless tables at nodes in the network. Clients regularly transmit request packets toward a server; a node receives the request packet, and subsequently receives a delivery-table-creation packet or a delivery packet from the server; if the node has no delivery table corresponding to the server, the node creates the delivery table, registers the addresses of the clients, and their request packet arrival times, and regularly transmits the request packet toward the server; when the node has received a delivery packet from the server, the node duplicates and delivers the delivery packet only to those clients whose request packet arrival times, registered in the delivery table, are within a fixed period from the arrival of the delivery packet.
    Type: Application
    Filed: April 5, 2002
    Publication date: November 14, 2002
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventors: Seiichiro Tani, Toshiaki Miyazaki, Noriyuki Takahashi, Takahiro Murooka, Shinya Ishihara, Takeru Inoue