Patents Assigned to Duncan Industries Parking Control Corp.
  • Sensor for measuring the magnetically responsive characteristics of tokens
    Patent number: 5119916
    Abstract: An improved magnetic field sensor for detecting tokens is disclosed which has one Hall effect sensor located between a magnet and an inclined token track base and another Hall effect sensor located between another magnet and the inclined token track base. The Hall effect sensors are placed at distances above the inclined token track base which optimize their accuracy in detecting tokens which have two concentric regions with different magnet characteristics.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: June 9, 1992
    Assignee: Duncan Industries Parking Control Corp.
    Inventors: Ralph H. Carmen, John W. Van Horn
  • Low-power device for sorting tokens
    Patent number: 5060777
    Abstract: A low power device for sorting tokens as part of a coin-operated meter is disclosed. The device sorts a token while it is falling under the influence of gravity and assures that a movable gate, which directs the token to one of two paths, is in the proper position before the token reaches the gate. Power to move the gate is used only when the position of the gate is to be changed.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: October 29, 1991
    Assignee: Duncan Industries Parking Control Corp.
    Inventors: John W. Van Horn, Ralph H. Carmen