Patents by Inventor David Charles Richardson

David Charles Richardson 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).

  • SIP user agent with simultaneous multiple registrations
    Patent number: 8055778
    Abstract: A method, device, and computer program product for Session Initiation Protocol (SIP) communications is disclosed. The method, device, and computer program product allow a SIP user agent of a SIP-enabled device to register with a plurality of SIP registrars. The plurality of SIP registration may occur simultaneously or sequentially, based on preference information for the SIP registrars.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: November 8, 2011
    Assignee: Siemens Enterprise Communications, Inc.
    Inventors: David Charles Richardson, Gary Edward Mora