Airtime usage limiting system
US6442406B1 · kind B1 · utility
13Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1999 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Oct 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2215/92
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A call time usage system for a portable telephone allows entering call time usage information into the portable telephone. The limits include limits on total airtime and airtime per call for a specified interval. After the specified interval, the limits are reset. A list of exempt numbers is also stored so that the user can call those exempt numbers even after the limit is exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.