Patents by Inventor Kelvin Leonard Cheung

Kelvin Leonard Cheung 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).

  • Distributed call routing in a VoIP system
    Patent number: 9319531
    Abstract: A distributed call routing system and method are used to provide higher quality VoIP connections with flexible codec choices and simplified NAT and firewall traversal. An analog telephone adapter (ATA) communicates a call destination to a network information server (NIS), which provides multiple routes. The ATA uses this information and local and/or non-NIS information to initiate the call using the preferred routing.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: April 19, 2016
    Assignee: ooma, Inc.
    Inventors: Simon Capper, Kelvin Leonard Cheung
  • Distributed call routing in a VoIP system
    Patent number: 8804697
    Abstract: A distributed call routing system and method are used to provide higher quality VoIP connections with flexible codec choices and simplified NAT and firewall traversal. An analog telephone adapter (ATA) communicates a call destination to a network information server (NIS), which provides multiple routes. The ATA uses this information and local and/or non-NIS information to initiate the call using the preferred routing.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: August 12, 2014
    Assignee: ooma, Inc.
    Inventors: Simon Capper, Kelvin Leonard Cheung