Utilization management system of portable telephone

Details Utilization management system of portable telephone Utilization management system of portable telephone

1997-12-04

1999-11-23

Chin, Wellington

Telecommunications

Radiotelephone system

Emergency or alarm communication

455 88, H04B 1008

Patent

active

059916141

ABSTRACT:
The shielded area 3 which is shielded from radio waves is provided at the entrance to the protected area 1, for example, installed with medical equipment. The transmitter 6 in the shielded area 3 transmits the control signal 11 to the portable telephone 5, which returns the response signal 12 in response to the control signal 11. The receiver 7 receives the response signal 12 to notify the alarm 8 that the portable telephone 5 in operation. Thus, the alarm indicative of turning off the portable telephone 5 urges the holder 2 thereof not to carry the portable telephone 5 into the protected area 1.

REFERENCES:
patent: 4560978 (1985-12-01), Lemelson
patent: 4965548 (1990-10-01), Fayfield
patent: 5119018 (1992-06-01), Katayama et al.
patent: 5235633 (1993-08-01), Dennison et al.
patent: 5442805 (1995-08-01), Sagers et al.
patent: 5543779 (1996-08-01), Aspesi et al.

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