Patents by Inventor Elroy P. Cartwright

Elroy P. Cartwright 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).

  • Method for interrupting a telephone call after receiving a busy signal
    Patent number: 6310946
    Abstract: A telephone subscriber placing a telephone call through a telecommunications network (10) to a telephone line carrying an existing call may interrupt that call by entering an interrupt code to the network. Upon receipt of the code, the network verifies whether the interrupt code is valid by consulting a data base (21) that cross-references interrupt codes to corresponding lines. If the code is valid for the line carrying the existing call, the network then interrupts the existing call.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: October 30, 2001
    Assignee: AT&T Corp
    Inventors: Thomas Michael Bauer, Elroy P. Cartwright, Walter C. Taylor
  • Method for interrupting a telephone call after receiving a busy signal
    Patent number: 5905788
    Abstract: A telephone subscriber placing a telephone call through a telecommunications network (10) to a telephone line carrying an existing call may interrupt that call by entering an interrupt code to the network. Upon receipt of the code, the network verifies whether the interrupt code is valid by consulting a data base (21) that cross-references interrupt codes to corresponding lines. If the code is valid for the line carrying the existing call, the network then interrupts the existing call.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: May 18, 1999
    Assignee: AT&T Corp
    Inventors: Thomas Michael Bauer, Elroy P. Cartwright, Walter C. Taylor