Electric alarm clock with battery back-up

Details Electric alarm clock with battery back-up Electric alarm clock with battery back-up

1992-06-03

1994-08-16

Roskoski, Bernard

Horology: time measuring systems or devices

Chronological

With auxiliary illumination for display

368227, 368 64, G04B 1930

Patent

active

053392965

ABSTRACT:
An electric alarm clock is disclosed which operates from a conventional external AC power source but is able to continue timekeeping in the event power from the external source is interrupted. A dial illumination feature is also operable during a power failure.

REFERENCES:
patent: 2875320 (1959-06-01), Whiston
patent: 2895038 (1959-02-01), Campbell
patent: 3136115 (1964-06-01), Calabrese
patent: 3574993 (1971-04-01), Black
patent: 3590233 (1971-06-01), Protzmann
patent: 3922588 (1975-11-01), Kunzel
patent: 4262350 (1981-04-01), Nagashima
patent: 4726002 (1988-02-01), Bitetti

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