Mobile telephone configurable as a monitor and a two way radio
US5995589A · kind A · utility
3Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Apr 7, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72502
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A telephony device is disclosed having a base station connectable to a switched network. At least two mobile units are connectable to the switched network through the base station to receive incoming calls in a normal mode. The first mobile unit is operable in a monitor mode, where ringing thereof is prevented when incoming calls are received in the monitor mode. A microphone of the monitoring unit has a higher gain in the monitor mode than in the normal mode. In the monitor mode, transmission of sound signals to monitoring unit is suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.