Patents Assigned to Dan-Mar Co. Inc.
  • Alarm system
    Patent number: 4188621
    Abstract: A control circuit utilizing: a counter which provides first and second output signals at spaced apart time intervals and delay means for stopping and starting the counter; and switch means having start and stop inputs and an output connected to the delay means of the counter. The switch means, being arranged to start the counter when the start input is energized, and being arranged to stop the counter when the stop input is energized. The stop input of the switch means being actuated by the first counter output signal.
    Type: Grant
    Filed: January 18, 1978
    Date of Patent: February 12, 1980
    Assignee: Dan-Mar Co. Inc.
    Inventors: James D. Heckelman, Robert A. Ziemke