Remote-controlled doorbell signal receiver

Details Remote-controlled doorbell signal receiver Remote-controlled doorbell signal receiver

1983-11-21

1985-06-11

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340326, 340384R, H04Q 900, H04B 100, G08B 2700

Patent

active

045231931

ABSTRACT:
A remote-controlled doorbell adapted for connection across the existing doorbell in a building having a wired doorbell system. A transmitter for generating an over-the-air radio signal is coupled across the wired doorbell so that the transmitter will be actuated in response to current flowing through the wired doorbell. A remote receiver coupled to sound producing means receives the over-the-air radio signal and actuates the sound producing means when the existing doorbell is energized.

REFERENCES:
patent: 3184727 (1965-05-01), Miessner
patent: 3544987 (1970-12-01), McMann, Jr. et al.
patent: 3795896 (1974-03-01), Isaacs
patent: 3821707 (1974-06-01), Peters
patent: 4021728 (1977-03-01), Fowler
patent: 4243973 (1981-01-01), Sandidge
patent: 4316273 (1982-02-01), Jetter
patent: 4370675 (1983-01-01), Cohn

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