Programmable electronic circuit

Communications: electrical – Audible indication – Electronic

Reexamination Certificate

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Details

C340S392100, C340S392400, C340S392500

Reexamination Certificate

active

07023325

ABSTRACT:
A programmable electronic circuit is disclosed. The circuit includes a CPU, signal-generating circuitry, and RC circuitry having at least two capacitors, such that when both of the capacitors are switched into the RC circuitry by the CPU, a signal is produced from an output of the signal-generating circuitry that is longer in duration than when one of the capacitors is switched into the RC circuitry.

REFERENCES:
patent: 3609020 (1971-09-01), Kelly
patent: 4073133 (1978-02-01), Earls et al.
patent: 4110750 (1978-08-01), Heyning et al.
patent: 4215339 (1980-07-01), Durkee
patent: 5633625 (1997-05-01), Gaub et al.
patent: 5894262 (1999-04-01), McCavit et al.
patent: 6573786 (2003-06-01), Lee et al.
patent: 2003/0003950 (2003-01-01), Kroll et al.

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