Electronic clock

Details Electronic clock Electronic clock

1981-04-14

1983-12-06

Weldon, Ulysses

Horology: time measuring systems or devices

Chronological

With supplemental power source

368 48, 368 66, 368155, 368156, 368157, G04B 100

Patent

active

044190174

ABSTRACT:
A plug-in electronic clock being operated either by a commercial power source in a normal state or by a D.C. power source in case of a power failure, said electronic clock having means for generation of a pulse train used for a computation of time information in case of a power failure and means for stopping generation of the said pulse train in a case where the commercial power is active so as to prevent interference noise against radio receivers or television receivers, with a correct time information computation being assured when the commercial power source is recovered.

REFERENCES:
patent: 3902311 (1975-09-01), Chacon et al.
patent: 3998043 (1976-12-01), Tamaru et al.
patent: 4032864 (1977-06-01), Yamashiro et al.
patent: 4040247 (1977-08-01), Haydon

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