Patent · US Expired

Security tag, which can be fitted to an object, for signalling an attempted theft

US5421177A · kind A · utility

59Cited by

12References

26Claims

0Family size

Assignee

Venda Security Systems, Inc. · US

Inventors

Heinrich Sieber · Interlaken, CH
Roland Wolf · Hersbruck, DE

Key dates

Filing date	Mar 30, 1992
Grant date	Jun 6, 1995
Priority date	—
Expiry date	Mar 30, 2012

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T292/498
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The security tag (10) has a housing (11) and a clasp (12), which can move longitudinally therein, in the manner of a padlock. In its closed position, a piston (20), which is prestressed by a spring (21), engages into a gap or interruption (15) in the clasp (12). In order to open the clasp (12), a reduced-pressure source, which raises the piston (20), is placed onto a projection (28), so that the said piston releases the clasp (12). The use of a reduced-pressure source exacerbates the unauthorized opening of the security tag.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.