Patents by Inventor Ken Sambu

Ken Sambu 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, management apparatus, communication apparatus and computer program
    Patent number: 8189624
    Abstract: In a ring type network, a master node sends a measurement packet to a slave node; receives the measurement packet which has been circulated among a plurality of slave nodes; according to time-keeping of an internal clock; stores a sending time and a received time of the measurement packet; sends a measurement result notifying packet showing the sending time and the received time of the measurement packet to the slave node, and each slave node receives the measurement packet; sends the measurement packet received to the next node; according to time-keeping of the internal clock, stores a received time of the measurement packet; further receives a measurement result notifying packet; calculates a time correction value using the sending time and the received time of the measurement packet shown in the measurement result notifying packet received, the received time of the measurement packet stored, a total number of node apparatuses, and a difference between an order of the slave node and an order of the master n
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: May 29, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroshi Sakurada, Ken Sambu
  • COMMUNICATION SYSTEM, MANAGEMENT APPARATUS, COMMUNICATION APPARATUS AND COMPUTER PROGRAM
    Publication number: 20100118721
    Abstract: In a ring type network, a master node sends a measurement packet to a slave node; receives the measurement packet which has been circulated among a plurality of slave nodes; according to time-keeping of an internal clock; stores a sending time and a received time of the measurement packet; sends a measurement result notifying packet showing the sending time and the received time of the measurement packet to the slave node, and each slave node receives the measurement packet; sends the measurement packet received to the next node; according to time-keeping of the internal clock, stores a received time of the measurement packet; further receives a measurement result notifying packet; calculates a time correction value using the sending time and the received time of the measurement packet shown in the measurement result notifying packet received, the received time of the measurement packet stored, a total number of node apparatuses, and a difference between an order of the slave node and an order of the master n
    Type: Application
    Filed: April 4, 2007
    Publication date: May 13, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi Sakurada, Ken Sambu