Apparatus for disabling a telephone ringer
US6917680B1 · kind B1 · utility
17Cited by
12References
27Claims
0Family size
Inventors
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M2250/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus for disabling a telephone ringer includes a light sensing device operable to produce a signal indicative of a level of ambient light; and a controller operable to receive the signal and disable the telephone ringer when the signal indicates that the ambient light has reached a predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.