Electric alarm clock with battery back-up
US5339296A · kind A · utility
7Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Jun 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C21/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric alarm clock is disclosed which operates from a conventional external AC power source but is able to continue timekeeping in the event power from the external source is interrupted. A dial illumination feature is also operable during a power failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.