Patent · US Expired

Key telephone system signal priority arrangement

US4096358A · kind A · utility

13Cited by

6References

9Claims

0Family size

Assignee

Bell Telephone Laboratories, Inc. · US

Inventors

Richard Henry Bidlack · Boonton, US
Wayne Jay Egan · Eatontown, US
Steven G. Miller · Freehold Township, US

Key dates

Filing date	May 24, 1976
Grant date	Jun 20, 1978
Priority date	—
Expiry date	May 24, 1996

Classification

Technology area (CPC H)Electricity
CPC primaryH04M9/005
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A key telephone system signal priority arrangement is disclosed wherein each type of call in a key telephone system is assigned a distinctive priority. When a call is directed to a station engaged in an existing lower priority call, a warning tone is given to both parties engaged in this existing call. The existing call is then automatically placed on hold while the preempting call is completed to the called station such that the called station can answer the preempting call "hands-free".

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