Cordless telephone set having a warning signal representing that a storage battery is not being charged
US5479486A · kind A · utility
183Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1994 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Mar 14, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/19
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When the contacts are electrically disconnected under a condition where a handset is set in a concave of a charging stand, the output of a connection condition detecting circuit is of low level. Then, an inverted output thereof, that is, a high-level output is provided through an inverter to one input terminal of an AND circuit, and a switch is closed by the weight of the handset, so that a high-level output is provided also to the other input terminal of the AND circuit. Then, a logical product output of the AND circuit is of high level. As a result, a warning buzzer generates a warning sound to attract the user's attention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.