Global Patent Index - EP 1097438 A1

EP 1097438 A1 2001-05-09 - BATTERY-LESS TRANSPONDER CIRCUIT

Title (en)

BATTERY-LESS TRANSPONDER CIRCUIT

Title (de)

BATTERIELOSE TRANSPONDERSCHALTUNG

Title (fr)

CIRCUIT DE TRANSPONDEUR SANS PILE

Publication

EP 1097438 A1 (EN)

Application

EP 99933028 A

Priority

  • GB 9902250 W
  • GB 9815120 A

Abstract (en)

[origin: WO0004520A1] A battery-less transponder circuit for use in an Electronic Article Surveillance tag is disclosed. The transponder is comprised of first and second resonant circuits which are electrically coupled across a common component and yet resonate at different frequencies. The first resonant circuit ideally comprises an inductor, a capacitor, and a diode, and the second resonant circuit consists of only an inductor which is mutually coupled to the inductor of the first resonant circuit but is connected across the diode of the first resonant circuit. This connection has the effect of giving rise to a second resonant circuit which is both electrically and magnetically coupled to the first resonant circuit. An extremely inexpensive yet effective transponder circuit results.

IPC 1-7 (main, further and additional classification)

G08B 13/24; G06K 7/08

IPC 8 full level (invention and additional information)

G06K 19/07 (2006.01); G08B 13/24 (2006.01)

CPC (invention and additional information)

G08B 13/2422 (2013.01); G06K 19/0723 (2013.01); G08B 13/2431 (2013.01)

Citation (search report)

See references of WO 0004520A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0004520 A1 20000127; AU 4920599 A 20000207; EP 1097438 A1 20010509; GB 9815120 D0 19980909; TW 445436 B 20010711

INPADOC legal status


2008-02-22 [REG HK WD] APPLICATIONS WITHDRAWN, DEEMED TO BE WITHDRAWN, OR REFUSED AFTER PUBLICATION IN HONG KONG

- Document: HK 1033493

2002-06-12 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20011109

2001-06-20 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010508

2001-05-09 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010122

2001-05-09 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE