Patents by Inventor Keng Leung

Keng Leung 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: 7246373
    Abstract: Methods and apparatus for enabling VPN based mobility are provided. A VPN client having a client subnetwork address corresponding to a particular subnetwork can create a VPN tunnel using an enterprise address from a VPN server. Using the VPN tunnel, the VPN client can establish sessions with a variety of destination nodes including destination nodes on a private or enterprise network associated with the VPN server. When the client moves, the VPN client can acquire a new address that may correspond to a new subnetwork, but the VPN server provides the VPN client with the same enterprise address. Accordingly, the VPN client can maintain existing sessions with destination nodes using the same enterprise address.
    Type: Grant
    Filed: March 10, 2006
    Date of Patent: July 17, 2007
    Assignee: Cisco Technology, Inc.
    Inventors: Keng Leung, Alpesh S. Patel
  • Patent number: 7036143
    Abstract: Methods and apparatus for enabling VPN based mobility are provided. A VPN client having a client subnetwork address corresponding to a particular subnetwork can create a VPN tunnel using an enterprise address from a VPN server. Using the VPN tunnel, the VPN client can establish sessions with a variety of destination nodes including destination nodes on a private or enterprise network associated with the VPN server. When the client moves, the VPN client can acquire a new address that may correspond to a new subnetwork, but the VPN server provides the VPN client with the same enterprise address. Accordingly, the VPN client can maintain existing sessions with destination nodes using the same enterprise address.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: April 25, 2006
    Assignee: Cisco Technology, Inc.
    Inventors: Keng Leung, Alpesh S. Patel
  • Patent number: 7019595
    Abstract: A phase control loop circuit for tuning to a reference frequency signal having a phase lock loop (PLL) circuit being responsive to a reference frequency signal having a reference frequency, said PLL circuit including a voltage control oscillator (VCO) for generating a VCO output, said PLL circuit for generating a PLL output, said phase control loop circuit processing said VCO output to generate an output frequency signal having an output frequency, in accordance with an embodiment of the present invention.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: March 28, 2006
    Assignee: Ralink Technology, Inc.
    Inventors: Chung When Lo, Keng Leung Fung