Public modular-telephone management system
US5138648A · kind A · utility
43Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Apr 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A public modular telephone management system. By using several units and systems, as well as ancillary elements for managing public modular telephones, it is possible to provide the public modular telephones with means of making payment for the service by using several types of cards such as: credit, prepayment, telephone subscriber or multiservice cards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.