Appeal No. 1997-1698 Application No. 08/348,447 electrical circuitry disposed within the enclosure, including a source of an adjustable threshold signal and a comparator operative to compare the threshold signal to the output of the detector and deliver a signal to change the state of the indicator if the output of the detector exceeds the threshold signal. 3Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 NextLast modified: November 3, 2007