Patents Assigned to Markar Products, Inc.
  • Adjustable door hinge monitoring device
    Patent number: 6577235
    Abstract: The invention is in a device for monitoring the position of a swinging door that is mounted on a stationary frame, the device essentially comprises a magnet and magnetic proximity sensor which are mounted in coaxially aligned relation on a pair of opposing leafs of a hinge. Means are provided for moving the magnet to and from the sensor to correspondingly vary the gap or spacing between them.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: June 10, 2003
    Assignee: Markar Products, Inc.
    Inventor: Thomas J. Frys