Patents Examined by John S. Hayman
  • Proximity switch circuit
    Patent number: 3936755
    Abstract: An input terminal is quiescently biased to a voltage closer to the initial threshold setting of a first comparator than to that of a second comparator. In response to the proximity of an object, an alternating voltage is induced on this terminal of an amplitude to actuate only the first comparator. Each time a comparator is actuated, a two state circuit changes the threshold settings of the comparators to bring the one formerly outside of the range of the alternating voltage to within its range and vice versa.
    Type: Grant
    Filed: July 19, 1974
    Date of Patent: February 3, 1976
    Assignee: RCA Corporation
    Inventor: Abel Ching Nam Sheng