Patents by Inventor Hugh Melvin

Hugh Melvin 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).

  • System and method for determining clock skew in a packet-based telephony session
    Patent number: 7639716
    Abstract: A method for determining clock skew in a packet-based telephony session is disclosed. A telephony device receives RTCP SR packets from a remote telephony device transmitting RTP packets in a telephony session. Each control packet includes an NTP time-stamp and a RTP time-stamp. The device determines from two or more of the received SR packets a first relative rate of a remote media card clock to the remote system clock rate. Further, the device determines from two or more transmitted RTCP SR packets, a second relative rate of a local media card clock to the local system clock rate. The device can then be adjusted to take into account the first and second relative rates for optimum buffer management and to more accurately adjust the quality of a session based on one-way packet delay.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: December 29, 2009
    Assignees: University College Dublin, National University of Ireland, Dublin, National University of Ireland, Galway
    Inventors: Liam Murphy, Hugh Melvin
  • System and method for determining clock skew in a packet -based telephony session
    Publication number: 20070116057
    Abstract: A method for determining clock skew in a packet-based telephony session is disclosed. A telephony device receives RTCP SR packets from a remote telephony device transmitting RTP packets in a telephony session. Each control packet includes an NTP time-stamp and a RTP time-stamp. The device determines from two or more of the received SR packets a first relative rate of a remote media card clock to the remote system clock rate. Further, the device determines from two or more transmitted RTCP SR packets, a second relative rate of a local media card clock to the local system clock rate. The device can then be adjusted to take into account the first and second relative rates for optimum buffer management and to more accurately adjust the quality of a session based on one-way packet delay.
    Type: Application
    Filed: June 18, 2004
    Publication date: May 24, 2007
    Inventors: Liam Murphy, Hugh Melvin
  • Plasticized polymers of vinyl acetate
    Patent number: 4111888
    Abstract: Polyesters derived from the reaction of a phthalic acid, with ethylene glycol, di-ethylene glycol or a polyethylene glycol and an aliphatic alcohol are used as plasticisers for vinyl acetate polymers.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: September 5, 1978
    Assignee: Ciba Geigy AG
    Inventors: Frank Lamb, Malcolm Combey, Hugh Melvin Cooper
  • Plasticized polymers of vinyl acetate
    Patent number: 4085083
    Abstract: Polyesters derived from the reaction of a dibasic acid, a polyethylene glycol and an aliphatic alcohol are used as plasticizers for vinyl acetate polymers.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: April 18, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Frank Lamb, Malcolm Combey, Hugh Melvin Cooper
  • Polymers of vinyl acetate plasticized with low molecular weight polyesters
    Patent number: 4085082
    Abstract: Polyesters derived from the reaction of a dibasic acid, ethylene glycol and an aliphatic alcohol are used as plasticizers for vinyl acetate polymers.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: April 18, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Frank Lamb, Malcolm Combey, Hugh Melvin Cooper
  • Plasticized polymers of vinyl acetate
    Patent number: 4076678
    Abstract: Polyesters derived from the reaction of a dibasic acid, a polyethylene glycol and an aliphatic alcohol are used as plasticizers for vinyl acetate polymers.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: February 28, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Frank Lamb, Malcolm Combey, Hugh Melvin Cooper