Multiple party telephone control system
US4987590A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1990 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jan 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/487
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
To interface a primary telephone terminal with a vast number of remote terminals through a telephone network, parties at the remote terminals are individually screened to attain a select group. Bridged together, the select group is preliminarily informed of the status of the interface by a voice generator and, accordingly, the multitude of connections are synchronized for the interface. On cue, the select group is coupled to the primary telephone terminal for unilateral communications. Deviations from the unilateral communication include select bilateral communication for a few of the remote terminals and digital communication from the remote terminals by push button as for polling applications. Subjects for interfaces are programmed for selection from a memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.