Patents by Inventor Christopher E Caldwell

Christopher E Caldwell 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).

  • Mobile computing device geographic location determination
    Patent number: 8116291
    Abstract: A wireless connection between a mobile device and an IP-based wireless telecommunications network is established when the mobile device registers with a network controller (NC) through an access point (AP). When a geographical position is needed for the mobile device (e.g., a 911 call), messages are exchanged between the NC and a serving mobile location center (SMLC), where the SMLC retrieves information from a database that is used to identify the geographic position of the mobile device. The database can store a variety of information related to mobile devices such as: last known position, IP address, MAC address, a mobile or subscriber identifier (such as an International Mobile Subscriber Identity (IMSI)), last CGI, etc. The geographical position is communicated back to the NC, which can then forward the position information to a switch for processing such as for 911 calls.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: February 14, 2012
    Assignee: T-Mobile USA, Inc.
    Inventors: Magesh Annamalai, Christopher E Caldwell, Simon Chapman, Christopher H. Joul, Justin Mueller, Janne P. Linkola, John F. Pottle, Ryan N. Jensen