发明名称 |
APPLIANCE THEFT PREVENTION ALARM SYSTEM |
摘要 |
A theft prevention alarm system for use with an electrical appliance which includes a transmitter located within the appliance and which continuously generates an electrical signal of a predetermined frequency over the alternating current power supply lines. A receiver is connected to the alternating current power supply and operates an alarm system when the electrical signal having the predetermined frequency can no longer be detected.
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申请公布号 |
US3633199(A) |
申请公布日期 |
1972.01.04 |
申请号 |
USD3633199 |
申请日期 |
1969.10.02 |
申请人 |
STEPHEN M. CURRY;PHILIP A. WILLIAMS |
发明人 |
STEPHEN M. CURRY;PHILIP A. WILLIAMS |
分类号 |
G08B13/14;G08B25/06;(IPC1-7):G08B13/14 |
主分类号 |
G08B13/14 |
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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