Resonant sounder device for producing multiple warning sounds
US4488145A · kind A · utility
6Cited by
8References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1981 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | Dec 31, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B3/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention produces at least two sound signals such as warning signals or actuating signals by one sounder having a resonant frequency, wherein one of the sound signals is indicated by the resonant frequency of the sounder to enable a higher intensity sound to be produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.