Automatic telephone calling card
US5455857A · kind A · utility
Inventor
Key dates
| Filing date | Mar 18, 1993 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Mar 18, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/275
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An automated calling card is provided having internal means for generating audible tones representative of a telephone number or calling card number to be dialed. A small, card-shaped unit houses a microprocessor or logic circuitry, including means for inputting data, memory, means for generating tones, a speaker and a display. Telephone numbers and information pertaining thereto can be stored into memory through use of a keypad on the card. A calling card number is also stored in memory. In use, audible tones representative of a telephone and/or calling card number desired to be dialed are generated by the card. Use of a Personal Identification Number prohibits unauthorized access to features of the card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.