Patent · US Expired

Method for interrupting a telephone call after receiving a busy signal

US6310946A · kind A · utility

46Cited by

33References

16Claims

0Family size

Assignee

AT&T CORP. · US

Inventors

Thomas Michael Bauer · Madison, US
Elroy P. Cartwright · Annandale, US
Walter C. Taylor · South Lyon, US

Key dates

Filing date	Apr 23, 1997
Grant date	Oct 30, 2001
Priority date	—
Expiry date	Apr 23, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH04M7/00
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.