Electric impulse transmitters for telephone instruments

Details Electric impulse transmitters for telephone instruments Electric impulse transmitters for telephone instruments

1975-01-14

1976-08-03

Claffy, Kathleen H.

H04M 144

Patent

active

039730840

ABSTRACT:
In a telephone subscriber's circuit with provision for push-button dialling using a circuit that is powered by line current, a transistor switch is provided in place of conventional impulsing contacts.

REFERENCES:
patent: 3601552 (1971-08-01), Barnaby et al.
patent: 3787639 (1974-01-01), Battrick
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3879584 (1975-04-01), McCabe et al.

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