| 发明名称 |
Personal alarm |
| 摘要 |
A portable personal alarm which has a small size and achieves high sound levels utilizes the overdriving of a miniature buzzer. In order to reduce the likelihood of damage to the buzzer and create a more terrifying and noticeable sound, the alarm tone is pulsed.
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| 申请公布号 |
US4719454(A) |
申请公布日期 |
1988.01.12 |
| 申请号 |
US19850792897 |
申请日期 |
1985.10.30 |
| 申请人 |
HOPKINS INTERNATIONAL |
发明人 |
HOPKINS, HARRY C.;POWER, JOSEPH K. |
| 分类号 |
G08B3/10;G08B21/04;(IPC1-7):G08B13/00 |
主分类号 |
G08B3/10 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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