发明名称 |
Apparatus for disabling an alarm after a predetermined operating period |
摘要 |
Apparatus for disabling an alarm after a predetermined operating period employs a relay which is operated by a gate circuit. A contact of the relay applies operating potential to an alarm. An oscillator energizes a counter circuit and after a predetermined selectable period, the counter circuit inactivates the relay via the gate to cease alarm operation.
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申请公布号 |
US4164736(A) |
申请公布日期 |
1979.08.14 |
申请号 |
US19780889254 |
申请日期 |
1978.03.23 |
申请人 |
NAPCO SECURITY SYSTEMS INC |
发明人 |
STOCKDALE, ROY |
分类号 |
G08B13/00;G08B17/00;G08B19/00;(IPC1-7):G08B19/00 |
主分类号 |
G08B13/00 |
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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