Method for indicating charge status of backup power supply and communication device employing the same
US8243917B2 · kind B2 · utility
0Cited by
0References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2009 |
| Grant date | Aug 14, 2012 |
| Priority date | — |
| Expiry date | Feb 10, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/2535
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for indicating the charge status of a backup power supply of a communication device includes detecting the charge status of the backup power supply. If the charge status of the backup power supply is lower than or equal to a predetermined charge status, the communication device alerts via a telephone connected thereto. The communication device alerts a user by sounding one or more tones if the telephone is off-hook, and alerts user by sounding one or more rings if the telephone is on-hook.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.