| 发明名称 |
Extra loud low frequency acoustical alarm assembly |
| 摘要 |
The invention is an improved piezoelectric noise-making and audible signaling device which produces a distinctive 2 KHz tone that is more pronounced and significantly easier to perceive, especially in a noisy environment. The volume of the audible tone is amplified by using two or three sound-amplifying chambers or cavities.
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| 申请公布号 |
US6512450(B1) |
申请公布日期 |
2003.01.28 |
| 申请号 |
US20000488693 |
申请日期 |
2000.01.20 |
| 申请人 |
MALLORY SONALERT, PRODUCTS, INC. |
发明人 |
BURNETT GEORGE ALAN;BALDWIN CHRISTOPHER MICHAEL |
| 分类号 |
G08B3/10;(IPC1-7):G08B3/00 |
主分类号 |
G08B3/10 |
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