Telephone in-use indicator system
US6225897A · kind A · utility
115Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Feb 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/048
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A warning system for notifying others that a cellular telephone is in use in a vehicle. The system includes a transmitter electrically coupled to a cellular telephone for transmitting an in-use signal when the telephone is activated. A receiver for receiving the in-use signal. An indicator, responsive to the receiver receiving the in-use signal, for visually indicating that a cellular telephone is in use in a vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.