Tag and method of making same
US4954814A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Sep 11, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/1545
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
This invention relates to a deactivatable tag useable with an electronic article surveillance system and comprised of planar conductive material cut into a pair of inverse, first and second spiral conductors wrapped about each other and positioned for capacitance and inductive coupling. The invention also relates to method of making tags wherein conductors are cut from a planar web of conductive material in a continuous process in a manner that the cutting results in the formation of two spiral conductors without accompanying waste of conductive material, and thereafter positioning the conductors to provide resonant circuits. The conductors of each pair are connected by welding to provide a reliable circuit. A deactivator includes a composite strip with a conductive layer, a normally nonconductive layer adhered to the conductive layer, and a coating surrounding the adhered layers which is positioned in proximity to the resonant circuit so that, when excess energy is applied to the deactivator, the normally non-conductive layer becomes conductive and the coating is rendered ineffective whereby the resonant circuit is deactivated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.