×

TAMPER-PROOF SHOPLIFTING ALARM

  • US 3,596,265 A
  • Filed: 06/17/1968
  • Issued: 07/27/1971
  • Est. Priority Date: 06/17/1968
  • Status: Expired due to Term
First Claim
Patent Images

1. A shoplifting alarm comprising a housing, a plurality of circuit jacks mounted on a wall of said housing, a number of continuity loop segments attachable to said jacks for completing a continuity loop, an alarm circuit including alarm means and relay means, said alarm circuit being contained within said housing, means at the other end of said loops for securing said loops to articles of displayed merchandise, means for preventing substantial separation of said loop segments from said housing, said continuity loop and said relay means being so coupled to said alarm means as to delay energization thereof until a break occurs in one of said loop segments, said relay means including a controlled semiconductor having a triggering electrode, circuit means for connecting said semiconductor in series with said alarm means and a source of electric potential so that said alarm means are energized in the conductive state of said semiconductor, a triggering circuit for connecting said triggering electrode to said source, and a shunting continuity circuit including said continuity loop segments connected across at least a portion of said triggering circuit to prevent the application of source potential to said electrode.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×