Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1990-01-23
1992-08-18
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
3404255, 340426, 340531, 340425, 379 42, 379 44, 455 541, G08B 108, H04B 100
Patent
active
051403080
ABSTRACT:
A mobile radio system has an upward and downward control channel for controlling a call-out transmitted from a mobile terminal station, independently from a communication channel. The system detects an abnormal state of an automobile equipped in the mobile terminal station, and automatically transmits a call-out signal through the upward control channel to said base station when the abnormal state is detected. The abnormal state occurs when a door is opened, for example. It receives a response signal via the downward control channel from a base station, the response signal corresponding to the call-out signal of the terminal station, and produces an alarm sound when identification signal ID of the terminal station is detected from the response signal. Thus, the abnormal state of the automobile can be indicated by the alarm sound outputted from the portable receiver, thereby preventing the automobile from theft.
REFERENCES:
patent: 4208630 (1980-06-01), Martinez
patent: 4652859 (1987-03-01), Van Wienen
patent: 4692742 (1987-09-01), Raizen
patent: 4821309 (1989-04-01), Namekawa
patent: 4856047 (1989-08-01), Saunders
patent: 4887291 (1989-12-01), Stillwell
patent: 4993059 (1991-02-01), Smith et al.
Crosland Donnie L.
Fujitsu Limited
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