Combined piezoelectric silent alarm/battery charger
US6252336A · kind A · utility
97Cited by
7References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Nov 8, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A communication device such as a pager or cellular telephone which requires battery power, uses a piezoelectric device as both a vibrating silent alarm and a battery charger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.