Patents by Inventor Hidefumi Natsume

Hidefumi Natsume 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).

  • Layer 2 switch and method of processing expansion VLAN tag of layer 2 frame
    Patent number: 7394810
    Abstract: A layer 2 switch enables communication between different layer 2 networks by rewriting an expansion VLAN tag according to a network of a frame transfer destination, as well as producing the same effect, by rewriting an expansion VLAN tag, as that obtained by applying expansion VLAN tags to the third and the following stages.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: July 1, 2008
    Assignee: NEC Corporation
    Inventors: Hidefumi Natsume, Yasutaka Yamashita
  • Layer 2 switch and method of processing expansion VLAN tag of layer 2 frame
    Publication number: 20040095941
    Abstract: A layer 2 switch enables communication between different layer 2 networks by rewriting an expansion VLAN tag according to a network of a frame transfer destination, as well as producing the same effect, by rewriting an expansion VLAN tag, as that obtained by applying expansion VLAN tags to the third and the following stages.
    Type: Application
    Filed: November 5, 2003
    Publication date: May 20, 2004
    Applicant: NEC CORPORATION
    Inventors: Hidefumi Natsume, Yasutaka Yamashita