Network implemented pay telephone set
US4897870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1987 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/023
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A pay telephone system which does not require the use of dedicated facilities in a telephone company and central office and which provides more efficient means for utilizing existing facilities to place public telephone calls. For only selected user telephone numbers, the telephone system places a set-up call to a call processor to request billing and other information needed to process the call at the local processor. The set-up call is then terminated and the user's call is automatically re-dialed into the switched telephone network from the telephone central office which serves the telephone presently being used. Numbers other than the selected numbers are called directly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.