Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-06-12
1999-07-27
Le, Thanh Cong
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455421, 455575, H04B 138
Patent
active
059307242
ABSTRACT:
A portable telephone of the present invention is provided with a portable telephone body and a flipper which is detachable from the body. The body is provided with a transmission and receiving section, a speaker section, and an transmission means for generating at least one of a warning signal for announcing that the flipper is disconnected from the portable telephone and a call signal when receiving a call-in. The flipper is provided with a microphone section and a receiving means for receiving warning signal and call-in signal. By structuring a portable telephone as described above, a user of this portable telephone can recognize a call-in and recognize theft or misplacing, as long as the user carries always the flipper. A stranger can not used this portable telephone using a wrong flipper because the portable telephone body operates only when a specified flipper is connected.
REFERENCES:
patent: 4421953 (1983-12-01), Zielinski
patent: 5040204 (1991-08-01), Sasaki et al.
patent: 5490286 (1996-02-01), Kah, Jr.
patent: 5732331 (1998-03-01), Harms
patent: 5752203 (1998-05-01), Yamashita
Japanese Office Action dated Jul. 28, 1998 with English Language transulation of Japanese Examiner's comments.
Armstrong Darnell R.
Cong Le Thanh
NEC Corporation
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