Multifunction two line telephone system

Details Multifunction two line telephone system Multifunction two line telephone system

1986-05-12

1987-09-01

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

With special service

379160, 379163, 379166, H04M 902

Patent

active

046913459

ABSTRACT:
A two line telephone available for the home or the small business employs five pushbuttons for line selection, conference, hold and intercom. The line circuits and the conferencing switches are opto-isolated so that a single transformer coupled power supply is used. The usual illumination is provided in all of the pushbuttons to indicate that their function is being implemented. The conference function is implemented using the transformer coupled SCR circuit of U.S. Pat. No. 3,470,867.

REFERENCES:
patent: 3470322 (1969-09-01), Rice et al.
patent: 3567867 (1971-03-01), Rice et al.
patent: 4132860 (1979-01-01), Rasmussen
patent: 4382163 (1983-05-01), White et al.
patent: 4394544 (1983-07-01), DeLeon

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