Telecommunications – Transmitter and receiver at same station – Having particular application of a transceiver
Reexamination Certificate
2007-12-18
2007-12-18
Nguyen, Duc M. (Department: 2617)
Telecommunications
Transmitter and receiver at same station
Having particular application of a transceiver
C455S090200, C455S404100
Reexamination Certificate
active
10368326
ABSTRACT:
When an emergency button8aof a radio communication apparatus has been turned ON and a transmit mode button8bhas been depressed, an MCU11sets frequencies of a receiving section2and a transmitting section3to an emergency communication frequency. The MCU11also causes an indicator lamp10to illuminate or flash at peak intensity, and causes a burst sound to be supplied from a loudspeaker6at the maximum volume. Then, the MCU11causes a built-in timer to measure a given time period while resetting the timer whenever a reception/transmission switching operation is performed or a communicating signal is detected. While the timer measures the time period, the MCU11causes the indicator lamp10to be turned off. When a timer expiration is detected, the MCU11causes the indicator lamp10to be turned on or flashed again.
REFERENCES:
patent: 5298883 (1994-03-01), Pilney et al.
patent: 5734320 (1998-03-01), Suzuki
patent: 6173169 (2001-01-01), Oh
patent: 6188891 (2001-02-01), Fujiki et al.
patent: 6484021 (2002-11-01), Hereford et al.
Cho Un C.
Fulwider Patton LLP
Nguyen Duc M.
Vertex Standard Co. Ltd.
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