Patents by Inventor Akio Yao

Akio Yao 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).

  • Patent number: 8036233
    Abstract: A power line communication apparatus transmits a signal to a first power line communication apparatus through a power line connecting to a second power line communication apparatus. The power line communication apparatus includes an information retriever for retrieving transmission rate information indicating both a first transmission rate and second transmission rate. The first transmission rate correspond to a first path of the power line along which the signal is directly transmitted to the first power line communication apparatus, and the second transmission rate corresponds to a second path of the power line along which the signal is transmitted through the second power line communication apparatus to the first power line communication apparatus. A selector selects, based on the transmission rate information, a path corresponding to a higher transmission rate among the first and second paths. A transmitter transmits the signal through the selected path.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: October 11, 2011
    Assignee: Panasonic Corporation
    Inventors: Yasushi Yokomitsu, Akio Yao, Yuji Igata, Noriaki Maehara
  • Patent number: 7406079
    Abstract: The present invention provides a repeater which automatically closes a dynamically opened port in accordance with prior setting, the repeater including: a port mapping table where a global IP address and an external port number, or an external port number on the Internet is associated with a local IP address and an internal port number of a terminal connected to a LAN; a control unit which, receiving a communications packet to which an external port number is specified, converts the external port number to an internal port number based on the port mapping table and transfers the internal port number to the LAN; a timer unit which counts the unoccupied time of the port after transferring a communications packet to which an external port number is specified; and a port management unit which checks whether the registered machine is present on the LAN and in case it is absent, deletes registration concerning the external port number from the port mapping table.
    Type: Grant
    Filed: April 20, 2004
    Date of Patent: July 29, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasushi Yokomitsu, Akio Yao, Toshiyuki Hamasaki, Hiroshi Konishi, Masahiro Shigyo, Yuji Mitsunaga, Kiminori Washitani, Hideaki Nagao
  • Publication number: 20080068141
    Abstract: A power line communication apparatus transmits a signal to a first power line communication apparatus through a power line connecting to a second power line communication apparatus. The power line communication apparatus includes an information retriever for retrieving transmission rate information indicating both a first transmission rate and second transmission rate. The first transmission rate correspond to a first path of the power line along which the signal is directly transmitted to the first power line communication apparatus, and the second transmission rate corresponds to a second path of the power line along which the signal is transmitted through the second power line communication apparatus to the first power line communication apparatus. A selector selects, based on the transmission rate information, a path corresponding to a higher transmission rate among the first and second paths. A transmitter transmits the signal through the selected path.
    Type: Application
    Filed: September 14, 2007
    Publication date: March 20, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yasushi YOKOMITSU, Akio YAO, Yuji IGATA, Noriaki MAEHARA
  • Publication number: 20040218614
    Abstract: The present invention provides a repeater which automatically closes a dynamically opened port in accordance with prior setting, the repeater including: a port mapping table where a global IP address and an external port number, or an external port number on the Internet is associated with a local IP address and an internal port number of a terminal connected to a LAN; a control unit which, receiving a communications packet to which an external port number is specified, converts the external port number to an internal port number based on the port mapping table and transfers the internal port number to the LAN; a timer unit which counts the unoccupied time of the port after transferring a communications packet to which an external port number is specified; and a port management unit which checks whether the registered machine is present on the LAN and in case it is absent, deletes registration concerning the external port number from the port mapping table.
    Type: Application
    Filed: April 20, 2004
    Publication date: November 4, 2004
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yasushi Yokomitsu, Akio Yao, Toshiyuki Hamasaki, Hiroshi Konishi, Masahiro Shigyo, Yuji Mitsunaga, Kiminori Washitani, Hideaki Nagao