Solid-state timer switch providing ac power to a load for a predetermined time after a main source of power is removed

Claim 1

A solid-state timer switch circuit comprising: a. a power terminal means comprising first and second terminals for connecting said circuit to an alternating current electrical power source, said first terminal connected to a common side of said circuit; b. a capacitance means connected one side to said common side of said circuit; c. a first resistance means connected one side to the second side of said capacitance means; d. a diode connected cathode to the other side of said first resistance means; e. a solid-state switching means having terminals one of which is connected to said common side of said circuit; f. a second resistance means connected one side to another terminal of said solid-state switching means and another side to a junction of said first resistance means and said capacitance means; g. a third resistance means connected one side to said common side of said circuit and another side to said solid-state switching means; h. a load connecting means including third and fourth terminals, said third terminal connected to said solid-state switching means; and i. a single-pole double-throw switch, a normally closed pole of which is connected to said fourth terminal, a common pole of which is connected to said second terminal and a normally open pole of which is connected to an anode of said diode.