Metered payment cellular telephone communication system
US5812945A · kind A · utility
63Cited by
54References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1995 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Dec 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2215/32
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention overcomes the disadvantages of the prior art by providing a cellular telephone metering systems that allows phone calls to be made as long as sufficient funds or call units reside in the phone. The apparatus of this invention also utilize encryption and employ seed numbers for the addition of funds or call units to the cellular phone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.