Identifying system of overlapped tag
US6840440B2 · kind B2 · utility
25Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 2002 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Sep 1, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07796
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An identifying system for overlapped tags, wherein one of the tags, e.g., a tag to be appended to an article, has an antenna coil and a radio frequency identification device (RFID) connected to the antenna coil. Two or more resonance capacitors are connected in parallel to each other and in parallel to the antenna coil and two or more switches electrically connect the two or more resonance capacitors to the antenna coil and to the RFID. A control circuit is configured to operate on-off controls of the two or more switches to change a resonance frequency of the identifying system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.