Alarm tag and method of making and deactivating it
US4778552A · kind A · utility
31Cited by
10References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1987 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | Apr 22, 2007 |
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 capacitive 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.