GB2353387A - Magnetic patterns - Google Patents

Magnetic patterns

Info

Publication number
GB2353387A
GB2353387A GB0025433A GB0025433A GB2353387A GB 2353387 A GB2353387 A GB 2353387A GB 0025433 A GB0025433 A GB 0025433A GB 0025433 A GB0025433 A GB 0025433A GB 2353387 A GB2353387 A GB 2353387A
Authority
GB
United Kingdom
Prior art keywords
magnetic patterns
magnetic
watermark
magnetic material
oersted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0025433A
Other versions
GB2353387B (en
GB0025433D0 (en
Inventor
Michael David Crossfield
David Howard Arnold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flying Null Ltd
Original Assignee
Flying Null Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flying Null Ltd filed Critical Flying Null Ltd
Publication of GB0025433D0 publication Critical patent/GB0025433D0/en
Publication of GB2353387A publication Critical patent/GB2353387A/en
Application granted granted Critical
Publication of GB2353387B publication Critical patent/GB2353387B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06187—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with magnetically detectable marking
    • G06K19/06196—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object

Abstract

This invention relates to a document which incorporates (1) a magnetic watermark and (2) a further magnetic material which is magnetically anisotropic and is in proximity to the magnetic watermark, said further magnetic material being in the form of a continuous layer of a metallic material having a coercivity of 10 Oersted or less.
GB0025433A 1998-03-18 1999-03-18 Magnetic patterns Expired - Fee Related GB2353387B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9805824.1A GB9805824D0 (en) 1998-03-18 1998-03-18 Magnetic patterns
PCT/GB1999/000835 WO1999048044A1 (en) 1998-03-18 1999-03-18 Magnetic patterns

Publications (3)

Publication Number Publication Date
GB0025433D0 GB0025433D0 (en) 2000-11-29
GB2353387A true GB2353387A (en) 2001-02-21
GB2353387B GB2353387B (en) 2001-09-05

Family

ID=10828827

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9805824.1A Ceased GB9805824D0 (en) 1998-03-18 1998-03-18 Magnetic patterns
GB0025433A Expired - Fee Related GB2353387B (en) 1998-03-18 1999-03-18 Magnetic patterns

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9805824.1A Ceased GB9805824D0 (en) 1998-03-18 1998-03-18 Magnetic patterns

Country Status (3)

Country Link
AU (1) AU2946099A (en)
GB (2) GB9805824D0 (en)
WO (1) WO1999048044A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10466316B2 (en) 2016-07-12 2019-11-05 Magnetic Insight, Inc. Magnetic particle imaging
WO2018023049A1 (en) 2016-07-28 2018-02-01 Sun Nuclear Corporation Beam angle direction determination
EP4309575A3 (en) 2017-08-16 2024-04-10 The Regents Of The University Of California Pulsed magnetic particle imaging systems and methods
JP2022523753A (en) 2019-03-13 2022-04-26 マグネティック・インサイト・インコーポレイテッド Magnetic particle operation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529938A (en) * 1974-10-16 1978-10-25 Emi Ltd Magnetic recording media
WO1997004338A1 (en) * 1995-07-17 1997-02-06 Flying Null Limited Improvements relating to magnetic tags of markers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529938A (en) * 1974-10-16 1978-10-25 Emi Ltd Magnetic recording media
WO1997004338A1 (en) * 1995-07-17 1997-02-06 Flying Null Limited Improvements relating to magnetic tags of markers

Also Published As

Publication number Publication date
WO1999048044A1 (en) 1999-09-23
AU2946099A (en) 1999-10-11
GB2353387B (en) 2001-09-05
GB0025433D0 (en) 2000-11-29
GB9805824D0 (en) 1998-05-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20060318