Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2007-08-07
2007-08-07
Urban, Edward F. (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S090200
Reexamination Certificate
active
10997253
ABSTRACT:
The send, end, and/or push-to-talk functions of a combination cellular telephone/two-way radio, are controlled with a single button on a hands-free device having a cable attached to the button, a microphone, and an earpiece. The button is pressed to instruct the cellular telephone/two-way radio to transmit in a half-duplex communications mode for a two-way radio conversation. The user speaks while continuing to press the button, to transmit the user's words in the two-way radio conversation. Next, the user releases the button, to instruct the cellular telephone/two-way radio to cease transmitting, to permit the user to hear words transmitted by the other party to the two-way radio conversation. Additionally, in some examples the user may answer an incoming cellular telephone call by pressing the button used during the two-way radio conversation, to instruct the cellular telephone/two-way radio to establish communications for a full duplex cellular telephone conversation.
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Klein, Richard, declaration, Jul. 16, 2003, 2 pages plus exhibits.
Ellis Timothy N.
Klein Electronics, Inc.
Nguyen Tu X.
Urban Edward F.
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