Patents by Inventor Duncan K. Sparrell

Duncan K. Sparrell 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: 8660114
    Abstract: A method and apparatus for handling internet access telephone calls made via cable company telephone services. A head end data terminal receives cable signals and converts them into individual signals. An intelligent switch detects signals destined for an internet service provider and routes those signals on a separate path to the internet service provider. A central switch routes the other signals along a telephone network. A computer program can control the steps of receiving cable signals, converting them into voice band signals, routing the signals that are not for the intended recipient to a central switch, multiplexing the signals for the intended recipient together, and sending the multiplexed signals to the intended recipient.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: February 25, 2014
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Vaidyanathan Ramaswami, Duncan K. Sparrell, Simon D. Byers, Kenneth W. Church
  • Publication number: 20120076138
    Abstract: A method and apparatus for handling internet access telephone calls made via cable company telephone services. A head end data terminal receives cable signals and converts them into individual signals. An intelligent switch detects signals destined for an internet service provider and routes those signals on a separate path to the internet service provider. A central switch routes the other signals along a telephone network. A computer program can control the steps of receiving cable signals, converting them into voice band signals, routing the signals that are not for the intended recipient to a central switch, multiplexing the signals for the intended recipient together, and sending the multiplexed signals to the intended recipient.
    Type: Application
    Filed: December 7, 2011
    Publication date: March 29, 2012
    Inventors: Vaidyanathan Ramaswami, Duncan K. Sparrell, Simon D. Byers, Kenneth W. Church
  • Patent number: 8094650
    Abstract: A method and apparatus for handling internet access telephone calls made via cable company telephone services. A head end data terminal receives cable signals and converts them into individual signals. An intelligent switch detects signals destined for an internet service provider and routes those signals on a separate path to the internet service provider. A central switch routes the other signals along a telephone network. A computer program can control the steps of receiving cable signals, converting them into voice band signals, routing the signals that are not for the intended recipient to a central switch, multiplexing the signals for the intended recipient together, and sending the multiplexed signals to the intended recipient.
    Type: Grant
    Filed: April 21, 2008
    Date of Patent: January 10, 2012
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Vaidyanathan Ramaswami, Duncan K. Sparrell, Simon D. Byers, Kenneth W. Church
  • Publication number: 20080205383
    Abstract: A method and apparatus for handling internet access telephone calls made via cable company telephone services. A head end data terminal receives cable signals and converts them into individual signals. An intelligent switch detects signals destined for an internet service provider and routes those signals on a separate path to the internet service provider. A central switch routes the other signals along a telephone network. A computer program can control the steps of receiving cable signals, converting them into voice band signals, routing the signals that are not for the intended recipient to a central switch, multiplexing the signals for the intended recipient together, and sending the multiplexed signals to the intended recipient.
    Type: Application
    Filed: April 21, 2008
    Publication date: August 28, 2008
    Inventors: Vaidyanathan Ramaswami, Duncan K. Sparrell, Simon D. Byers, Kenneth W. Church
  • Patent number: 7369542
    Abstract: A method and apparatus for handling internet access telephone calls made via cable company telephone services. A head end data terminal receives cable signals and converts them into individual signals. An intelligent switch detects signals destined for an internet service provider and routes those signals on a separate path to the internet service provider. A central switch routes the other signals along a telephone network. A computer program can control the steps of receiving cable signals, converting them into voice band signals, routing the signals that are not for the intended recipient to a central switch, multiplexing the signals for the intended recipient together, and sending the multiplexed signals to the intended recipient.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: May 6, 2008
    Assignee: AT&T Corp.
    Inventors: Vaidyanathan Ramaswami, Duncan K. Sparrell, Simon D. Byers, Kenneth W. Church
  • Patent number: 4999829
    Abstract: An arrangement is disclosed for recovering from faults in transmission equipment or facilities forming so-called virtual circuits for transmitting packets in a network. Faults are detected in transmission paths associated with a network node and a fault indication is generated for any virtual circuits passing through the node that are affected by the fault. The fault indications are then transmitted on corresponding ones of the affected virtual circuits or on other designated virtual circuits. If any of the affected virtual circuits are terminated in the node, no fault indications are generated for them and they are switched to alternate virtual circuits. Otherwise, the fault indications are transmitted on corresponding virtual circuits or on other designated virtual circuits over facilities connected to the node to other unknown nodes.
    Type: Grant
    Filed: November 6, 1989
    Date of Patent: March 12, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: Franklin D. Fite, Jr., Duncan K. Sparrell
  • Patent number: 4581737
    Abstract: A bit compression multiplexer for a pair of time division multiplexed digital bit streams each one of which includes a plurality of PCM encoded signals deposited in separate and distinct channels and signaling bits multiplexed therewith. The encoded signals are bit compressed (22), and then multiplexed and grouped (25) into clusters. Each of the multiplexed compressed signals occupies a separate and distinct channel of a repetitive frame that includes a plurality of clusters and a corresponding number of additional channels, called delta channels, each one of which is associated with a given cluster and is proximate thereto. The signaling bits are extracted (21) from the pair of digital bit streams, reformatted (24) and then placed in predetermined bit positions of the delta channels. The signaling bits in a given delta channel are associated with the compressed signals of a cluster proximate thereto. The combination of a cluster and its related delta channel comprise a bundle.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: April 8, 1986
    Assignee: AT&T Bell Laboratories
    Inventor: Duncan K. Sparrell