Personal phone expansion system

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network


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379 61, H04Q 730




A personal phone expansion system (10) includes a personal base station (12) and a plurality of portable units (18). The personal base (12) is connected to a phone line (16) and provides routing and switching between the phone line (16), the portable units (18), a full duplex speaker phone (24), and a voice messaging system (26). The voice messaging system (26), which is contained within the personal base station (12) provides full voice mail functions. The personal base station (12) communicates with the portable units (18) by radio signals through a wireless interface (32). The portable units (18) can be used as standard cellular telephones when outside the range of the personal base station (12).

patent: 4726050 (1988-02-01), Menich et al.
patent: 4771448 (1988-09-01), Koohgoli et al.
patent: 4782510 (1988-11-01), Szlam
patent: 4802235 (1989-01-01), Treatch
patent: 4815128 (1989-03-01), Malek
patent: 4989230 (1991-01-01), Gillig et al.
patent: 5177780 (1993-01-01), Kasper et al.
patent: 5193110 (1993-03-01), Jones et al.
patent: 5247567 (1993-09-01), Hirano
patent: 5289529 (1994-02-01), Karnowski
patent: 5291479 (1994-03-01), Vaziri et al.
patent: 5365573 (1994-11-01), Sakamoto et al.


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