Patents Assigned to Psi Limited
  • Device for protecting works of art
    Patent number: 4458241
    Abstract: An anti-theft device having a pair of contact elements mountable on a picture frame, one of the elements being pendulously swingable with reference to the other so as to contact or break contact with the other element when the picture is disturbed, and thereby actuating a circuit which sets off an alarm.
    Type: Grant
    Filed: September 1, 1981
    Date of Patent: July 3, 1984
    Assignee: Psi Limited
    Inventor: Henry E. Frankenberg