Patents by Inventor David Caswell McChristian

David Caswell McChristian 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: 6856674
    Abstract: The present invention is a method and apparatus for providing prepaid card service to customers for placing telephone calls without relying on a post-service billing model. A service management computer having access to a card database is connected to the network only by out-of-band connections. A voice response unit or a tone receiver and announcement player in the network are the voice interface with the customer and are provided at the originating switch in the network to eliminate multiple switches from the call path.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: February 15, 2005
    Assignee: AT&T Corp.
    Inventors: Nicholas D De Trana, Craig L DeCaluwe, Hossein Eslambolchi, Paul Greendyk, David Caswell McChristian
  • Patent number: 5684867
    Abstract: A method and apparatus for serving operator assistance calls from a remote operator assistance system but using the data base of the normal serving operator assistance system to verify the capability of the caller to place the desired call. The call is routed to the remote system where, for example, a specialized operator team, such as a Spanish speaking team, serves calls from an entire region or nation. The remote system accesses the data base of the normal serving system to obtain the data, describing the attributes of the caller, necessary to minimize the number of calls that are fraudulently completed.
    Type: Grant
    Filed: April 12, 1995
    Date of Patent: November 4, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: John P. Gesslein, Jr., Robert Michael Jelinski, David Caswell McChristian, William Francis Thompson