Patents Assigned to Frank E. Maddocks, III
  • Alignment system using two photocells directed at each other
    Patent number: 4185192
    Abstract: A passive optical switching apparatus for use with a sales display device, or with a secret security device or with a safety device. The apparatus includes two photo resistor systems which are positioned so that their optical axes and field of view intersect. Also included is the complementary electronic circuitry. If a light change occurs within the region defining the intersection a switching signal is created to trigger the device to which it is attached.
    Type: Grant
    Filed: March 27, 1978
    Date of Patent: January 22, 1980
    Assignees: Frank E. Maddocks, III, Dennis E. Belli
    Inventor: George R. Wagner