Synchronous receiving/transmitting departure alarm

Details Synchronous receiving/transmitting departure alarm Synchronous receiving/transmitting departure alarm

1996-11-04

1998-06-30

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340573, 340539, 34082549, 455343, 379 37, G08B 1314

Patent

active

057740542

ABSTRACT:
A synchronous receiving/transmitting departure alarm including a receiver unit and at least one transmitter unit cooperating with the receiver unit. Once a holder of the transmitter unit is far away from the holder of the receiver unit by a preset distance, the holder of the receiver unit can be in time warned. The transmitter unit intermittently transmits a clock pulse signal and a receiving circuit of the receiver unit is synchronously opened to receive the signal so as to judge whether the holder of the transmitter unit is within the preset distance. Therefore, a person under care or an article with the transmitter unit is prevented from missing or being lost. A mobile phone can be used with the alarm to inform the holder of the receiver unit of a phone call.

REFERENCES:
patent: 4449248 (1984-05-01), Leslie et al.
patent: 5175868 (1992-12-01), Yasuoka
patent: 5245314 (1993-09-01), Kah, Jr.
patent: 5357254 (1994-10-01), Kah, Jr.
patent: 5490286 (1996-02-01), Kah, Jr.

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