发明名称 |
Telephone music-on-hold device |
摘要 |
A telephone music device adapted to be inserted within the hollow portion of a telephone handset. The device draws power directly from the telephone line and requires no external power supply. When the handset is in a upright position, as normally utilized for a conversation, the telephone music device is electrically disconnected from the telephone circuit. However, when the handset is laid down such as on a table, the telephone music device becomes electrically interconnected with the telephone circuit. It draws power therefrom and generates a musical melody which is coupled to the telephone line. Alternate embodiments can be clipped to the handset or base of a modular telephone.
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申请公布号 |
US4415776(A) |
申请公布日期 |
1983.11.15 |
申请号 |
US19810255272 |
申请日期 |
1981.04.17 |
申请人 |
TANG, ROBIN K. L.;TANG, DONALD C. L. |
发明人 |
TANG, ROBIN K. L.;TANG, DONALD C. L. |
分类号 |
H04M1/21;H04M1/00;H04M1/738;H04M3/428;(IPC1-7):H04M1/00 |
主分类号 |
H04M1/21 |
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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