Patents by Inventor Douglas R. Cardy

Douglas R. Cardy 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).

  • Apparatus and method for virtual private telephone line with automatic ring down
    Patent number: 5577113
    Abstract: Apparatus and method for establishing a virtual private line with automatic ring down is provided. The virtual private line uses the SS7 switching network of present telephone systems coupled between the customer premises equipment of two virtual private line customers.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: November 19, 1996
    Assignee: DSC Communications Corporation
    Inventors: Paul M. Bray, Douglas R. Cardy, Charles P. Shelton
  • Apparatus and method for virtual private telephone line with automatic ring down
    Patent number: 5487110
    Abstract: Apparatus and method for establishing a virtual private line with automatic ring down is provided. The virtual private line uses the SS7 switching network of present telephone systems coupled between the customer premises equipment of two virtual private line customers.
    Type: Grant
    Filed: February 1, 1994
    Date of Patent: January 23, 1996
    Assignee: DSC Communications Corporation
    Inventors: Paul M. Bray, Douglas R. Cardy, Charles P. Shelton
  • Telecommunications system having separate switch intelligence and switch fabric
    Patent number: RE43361
    Abstract: The present invention is a telecommunications system having separate switch fabric and switch intelligence. The system comprises a switch fabric, a switch intelligence, and a feature processor. The switch intelligence is logically separated from the switch fabric and comprises a switch fabric proxy, a facility service, a connection manager service, and a call segment instance service. The switch fabric proxy is coupled to the switch fabric via a vendor-specific first Application Programming Interface (API). The switch fabric proxy supports a second API, which is common across all vendors, representing functions supported by the switch fabric. A facility instance, which is instantiated by a facility service using a facility model, represents the bearer and signaling facilities of a party to a call, and interacts with the switch fabric proxy via the second API to communicate with the switch fabric.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: May 8, 2012
    Assignee: MCI Communications Corporation
    Inventors: Douglas R. Cardy, Ken Rambo, Carol Waller