MORRIS KORNBLIT
Engineers in Pittsburgh, PA

6473281, Oct 29, 2002

Aug 17, 2000

09/641007

Morris J. Kornblit - Pittsburgh PA

General Electric Company - Schenectady NY

H02H 316

361 42, 361 932, 340650

A trip unit, such as one comprising a current sensor generating a current signal indicative of current in a power circuit, an analog to digital converter converting said signal into digital form, and a controller monitoring the current signal and sensing whether an over current condition exists and whether a ground fault condition exists. In case of an over-current condition, the controller causes a trip signal to be output resulting in the power circuit being opened. In the case of a ground fault condition, the controller causes an annunciation output signal but does not generate a trip signal in the case of a ground fault condition and therefore does not cause the power circuit to be opened.

4380760, Apr 19, 1983

Mar 26, 1981

6/247878

Morris J. Kornblit - Pittsburgh PA

General Electric Company - New York NY

G08B 1710, G08B 108

340628

The smoke detector is powered by standard AC current and a stand-by power source consisting of rechargeable batteries. A detector is provided for detecting the loss or failure of AC power, and the shift to the stand-by power source. The power loss detector initiates a time delay after which the smoke detector signal alarm is energized to alert the user about the loss of AC power. If AC power is restored before the time delay interval, the signal is not energized since the user need not be alerted. If the alarm is energized to alert the user of a loss of AC power, a manual reset switch may be used to terminate the alarm. If the manual reset switch is not used, the alarm is terminated automatically upon the restoration of AC power.