Patents Assigned to Marjo Systems, Inc.
  • Alarm system for three-element windows
    Patent number: 3943485
    Abstract: An alarm system is constructed to energize when the bottom window or the top window of a three-element window assembly is opened, so long as the third element (usually a screen) is not in its closed position in front of the window being opened or if the third element is removed from its mounting slides.The switching functions are performed by magnetic reed switches imbedded in the window frame and responsive to permanent magnets in the peripheral frame of the respective elements.
    Type: Grant
    Filed: May 1, 1975
    Date of Patent: March 9, 1976
    Assignee: Marjo Systems, Inc.
    Inventor: Martin Waldman