Electrical transmission or interconnection systems – Switching systems – Switch actuation
Reexamination Certificate
2006-04-11
2006-04-11
DeBeradinis, Robert L. (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
Switch actuation
C307S139000, C307S140000
Reexamination Certificate
active
07026729
ABSTRACT:
A system for activating a load such as an exhaust fan within an enclosed area concurrently with the activation of a lamp switch and for continuing the operation of the load for a predetermined period of time after the deactivation of the lamp switch. A monitor detects when the lamp switch is activated and provides an output signal representative thereof. A timer is provided which is deactivated when the monitor output signal is present but functions when the lamp switch is deactivated and after a preset but variable time provides a signal for deactivating the load. The timer includes a pulse generator and a counter which receives the output of the pulse generator and counts pulses when the lamp switch is deactivated and provides the deactivation signal for the load when it reaches a predetermined count.
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Paul Horowitz / Winfield Hill, The Art of Electronics 1986, Cambridge, p. 116.
Faith Richard
Homan Timothy C.
DeBeradinis Robert L.
Fulbright & Jaworski L.L.P.
Homan Timothy C.
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