Multi-signal alarm

Details Multi-signal alarm Multi-signal alarm

1985-12-11

1987-10-06

Roskoski, Bernard

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368250, G04C 2116

Patent

active

046979328

ABSTRACT:
A piezoelectric signaling device that produces a predetermined number of audio signals when activated. The device includes a timer, a pulser, an audio oscillator, and a piezoelectric transducer. The timer enables the pulser for a predetermined time. While enabled, the pulser produces pulses at a predetermined rate, thus producing a predetermined number of pulses. The oscillator is enabled during the pulses to produce a predetermined number of pulses of audio frequency electrical oscillations which are applied to the piezoelectric transducer to produce the predetermined number of audio signals.

REFERENCES:
patent: 3879931 (1975-04-01), Yasuda et al.
patent: 3906713 (1975-09-01), Suda et al.
patent: 3961284 (1976-06-01), Shora
patent: 4068461 (1978-01-01), Fassett et al.
patent: 4107625 (1978-08-01), de Mere
patent: 4316273 (1982-02-01), Jetter

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