Building intercom system

Details Building intercom system Building intercom system

1985-04-15

1987-04-14

Rubinson, Gene Z.

Telephonic communications

Telephone line or system combined with diverse electrical...

To produce visual-graphic copy

379173, H04M 904, H04M 1100

Patent

active

046580956

ABSTRACT:
An intercom system for a building having several occupied units served by the same entrance with a locked door. A control panel at the entrance has several call switches, one for each occupied unit. An individual two-wire line extends between the entrance control panel and a control panel in each occupied unit. A person in the occupied unit, which has been called from the entrance can release the entrance door after talking with the visitor. The system consumes electrical power only when needed.

REFERENCES:
patent: 2466701 (1949-04-01), Hall
patent: 3284571 (1966-11-01), Wittig
patent: 3404393 (1968-10-01), Blivice et al.
patent: 3484561 (1969-12-01), Matthews
patent: 3728493 (1973-04-01), TerVeen
patent: 3740487 (1973-06-01), TerVeen

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