Patents by Inventor Hisao Sagawa

Hisao Sagawa 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).

  • Radio bridge communication apparatus
    Patent number: 7769033
    Abstract: A radio bridging device is used for a communications network. If a source host transmits a communications request directed to a destination host, the radio bridging device records an IP address and a MAC address of the source host and an IP address of the destination host in a local table. A state of the source host is set as “LOCAL” if the source host belongs to a segment where the radio bridging device belongs, and set as “AIR” if otherwise. Further, a state of the destination host is set as “SEARCH”, and an ARP request directed to the destination host is broadcast. If an ARP response is received from the destination host, the state of the destination host is changed from “SEARCH” to “LOCAL” or “AIR” to be recorded in the local table together with a MAC address of the destination address.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: August 3, 2010
    Assignee: Futaba Corporation
    Inventor: Hisao Sagawa
  • Radio bridge communication apparatus
    Publication number: 20080008148
    Abstract: A radio bridging device is used for a communications network. If a source host transmits a communications request directed to a destination host, the radio bridging device records an IP address and a MAC address of the source host and an IP address of the destination host in a local table. A state of the source host is set as “LOCAL” if the source host belongs to a segment where the radio bridging device belongs, and set as “AIR” if otherwise. Further, a state of the destination host is set as “SEARCH”, and an ARP request directed to the destination host is broadcast. If an ARP response is received from the destination host, the state of the destination host is changed from “SEARCH” to “LOCAL” or “AIR” to be recorded in the local table together with a MAC address of the destination address.
    Type: Application
    Filed: July 10, 2007
    Publication date: January 10, 2008
    Applicant: Futaba Corporation
    Inventor: Hisao Sagawa