Global Patent Index - EP 1080441 A1

EP 1080441 A1 2001-03-07 - A METHOD AND A SYSTEM FOR REMOTE DETECTION OF MARKERS

Title (en)

A METHOD AND A SYSTEM FOR REMOTE DETECTION OF MARKERS

Title (de)

EIN VERFAHREN UND SYSTEM ZUR FERNENTSCHLÜSSELUNG VON MARKIERUNGEN

Title (fr)

PROCEDE ET SYSTEME DE DETECTION A DISTANCE DE MARQUEURS

Publication

EP 1080441 A1 (EN)

Application

EP 99929978 A

Priority

  • SE 9900786 W
  • SE 9801912 A

Abstract (en)

[origin: WO9962020A1] A method and a system is provided for remote detection of markers (10), each marker comprising at least two magnetic elements (13) arranged in a predetermined relationship providing an identity of the marker, by either exciting a respective magnetic element (13) to resonate mechanically or by exciting an electrical resonant circuit (14), to which the respective magnetic element (13) is coupled, to oscillate electrically. A resonant frequency (f?res?) of the respective magnetic element or of the electrical resonant circuit depends on an applied magnetic field (H), which is given a varying orientation. A corresponding variation in the resonant frequency (f?res?) is monitored, and an extreme value (f?min local?) of the variation is detected. A momentary orientation ( alpha ?min local?) of the magnetic field is determined in response to the detection of the extreme value, and an orientation of the respective element (13) is determined from this momentary field orientation.

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

G06K 7/08; G01B 7/00; G01D 5/12; G01V 3/08; G07C 11/00; G08B 13/24

IPC 8 full level (invention and additional information)

G01B 7/00 (2006.01); G01D 5/12 (2006.01); G01V 3/08 (2006.01); G06K 7/08 (2006.01); G06K 19/067 (2006.01); G08B 13/24 (2006.01)

CPC (invention and additional information)

G08B 13/2408 (2013.01); G01V 3/08 (2013.01); G06K 7/086 (2013.01); G06K 19/0672 (2013.01); G08B 13/246 (2013.01); G08B 13/2485 (2013.01)

Citation (search report)

See references of WO 9962020A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9962020 A1 19991202; EP 1080441 A1 20010307; JP 2002517004 A 20020611; SE 512488 C2 20000327; SE 9801912 D0 19980528; SE 9801912 L 19991129

INPADOC legal status


2003-05-28 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20021130

2001-09-05 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010724

2001-03-21 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001218

2001-03-21 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): DE FR GB

2001-03-07 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB