| 发明名称 |
Message alert system |
| 摘要 |
A lamp is provided on a telephone handset to notify the user that a message is waiting. The lamp is energized by a 1 hertz square wave obtained by demodulating a high frequency carrier sent from a transmitter.
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| 申请公布号 |
US4506115(A) |
申请公布日期 |
1985.03.19 |
| 申请号 |
US19830530935 |
申请日期 |
1983.09.12 |
| 申请人 |
GTE COMMUNICATIONS PRODUCTS CORPORATION |
发明人 |
SCHMITT, PAUL M. |
| 分类号 |
H04M1/82;H04M3/537;(IPC1-7):H04M1/64 |
主分类号 |
H04M1/82 |
| 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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