Identification system and method with passive tag
US5491468A · kind A · utility
77Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1993 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Jun 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An identification system with a reading device having a single turn transmission coil for continuously radiating alternating energy. A portable tag receives via a magnetic coupling, the energy from the reader and charges a storage capacitor to 5 volts. The capacitor is discharged rapidly during a time period less than the charging time period. This discharge of the capacitor powers a coded information transmission circuit during a small percentage of the duty cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.