GB1331604A - Magnetic information storage means - Google Patents

Magnetic information storage means

Info

Publication number
GB1331604A
GB1331604A GB5578769A GB1331604DA GB1331604A GB 1331604 A GB1331604 A GB 1331604A GB 5578769 A GB5578769 A GB 5578769A GB 1331604D A GB1331604D A GB 1331604DA GB 1331604 A GB1331604 A GB 1331604A
Authority
GB
United Kingdom
Prior art keywords
layer
particles
magnetic
acicular
pattern
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.)
Expired
Application number
GB5578769A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Publication of GB1331604A publication Critical patent/GB1331604A/en
Expired 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
    • G06K19/08—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 using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—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 using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/12—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 using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by magnetic means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/842—Coating a support with a liquid magnetic dispersion
    • G11B5/845—Coating a support with a liquid magnetic dispersion in a magnetic field

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Magnetic Record Carriers (AREA)
  • Credit Cards Or The Like (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

1331604 Magnetic cards EMI Ltd 3 Nov 1970 [14 Nov 1969] 55787/69 Heading B6A [Also in Division H1] A security or credit card comprises a layer containing acicular magnetic particles, the layer comprising a permanently structured magnetic layer in which the acicular particles in selected spaced regions are orientated in a predetermined direction, while the particles in the remainder of the layer are unorientated or orientated at right-angles to the predetermined direction. The magnetic layer may be laminated between other layers, the card is made by orientating selected areas of particles in a liquid layer, and then hardening. Thus (Fig. 1) a polyester film (1) is coated at (9) with a suspension of acicular magnetic particles, e.g. γ-Fe 2 O 3 in a hardenable liquid, e.g. resinous lacquer. Uni-directional current pulses derived from winding (8) act on the still-fluid coating to set up a cyclic orientation pattern in the magnetic particles. The pattern is rendered permanent by hardening the coating, using driers (12). The film carrying the hardened magnetic coating may be bonded to a stiff support, "face-up" or "face down", and may be covered with a protective opaque or coloured layer. In operation, the difference in remanence between orientated and unorientated portions, when the card is passed over a magnet, trigger mechanisms. The remanence difference develops a field pattern which can be used to is increased by pre-orientating the whole of the acicular particles in a direction at right angles to the subsequent pattern orientation direction.
GB5578769A 1969-11-14 1969-11-14 Magnetic information storage means Expired GB1331604A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5578769 1969-11-14

Publications (1)

Publication Number Publication Date
GB1331604A true GB1331604A (en) 1973-09-26

Family

ID=10474880

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5578769A Expired GB1331604A (en) 1969-11-14 1969-11-14 Magnetic information storage means

Country Status (5)

Country Link
JP (1) JPS4937529B1 (en)
DE (1) DE2055357C3 (en)
FR (1) FR2069355A5 (en)
GB (1) GB1331604A (en)
NL (1) NL170342C (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2277385A1 (en) * 1974-07-04 1976-01-30 Emi Ltd METHOD AND DEVICE FOR DETECTION OF MAGNETIC CONFIGURATIONS
US3998160A (en) * 1974-04-17 1976-12-21 Emi Limited Magnetic ink printing method
DE2752895A1 (en) * 1976-12-06 1978-06-08 Emi Ltd METHOD FOR PRODUCING A MATERIAL LAYER, THE SURFACE OF WHICH HAS A SCANABLE PATTERN, AS WELL AS A SECURITY DOCUMENT SYSTEM
US4114029A (en) * 1974-10-16 1978-09-12 E M I Limited Magnetic recording
FR2406277A1 (en) * 1977-10-15 1979-05-11 Emi Ltd MAGNETICALLY STRUCTURED MATERIALS
US4186944A (en) 1974-04-17 1980-02-05 Emi Limited Security document
US4197989A (en) * 1974-10-16 1980-04-15 Emi Limited Magnetic recording
US4228348A (en) * 1976-12-10 1980-10-14 E M I Limited Security document and system
EP0024800A1 (en) * 1979-08-04 1981-03-11 EMI Limited Security document and system
EP0025636A2 (en) * 1980-07-07 1981-03-25 General Kinetics, Incorporated Perpetuation of information in magnetically recorded medium
US4396886A (en) 1979-12-13 1983-08-02 Basf Aktiengesellschaft Document authentication by means of exchange-anisotropic magnetic material
US4438462A (en) 1979-12-13 1984-03-20 Basf Aktiengesellschaft Document identification employing exchange-anisotropic magnetic material
US4593336A (en) * 1982-05-18 1986-06-03 Emi Limited Magnetic recording
US4743490A (en) * 1986-02-24 1988-05-10 Minnesota Mining And Manufacturing Company Counterfeit-resistant magnetic recording tape
US4906988A (en) * 1987-01-27 1990-03-06 Rand Mcnally & Co. Object verification system and method
US4985614A (en) * 1987-01-16 1991-01-15 Rand Mcnally & Company Object verification apparatus and method
EP0428933A2 (en) * 1989-11-16 1991-05-29 MERCK PATENT GmbH Materials coated with plate like pigmets
US5177344A (en) * 1990-10-05 1993-01-05 Rand Mcnally & Company Method and appparatus for enhancing a randomly varying security characteristic
US5216229A (en) * 1989-06-05 1993-06-01 Rand Mcnally & Company Verifiable object having incremental key
WO1997027565A1 (en) * 1996-01-25 1997-07-31 Central Research Laboratories Limited Method of identifying a data carrier
WO1998015853A2 (en) * 1996-10-09 1998-04-16 Flying Null Limited Multi-bit magnetic tag and its method of manufacture
WO1999024942A1 (en) 1997-11-10 1999-05-20 Thorn Secure Science Limited A method of labelling an article
WO2003032246A1 (en) * 2001-10-05 2003-04-17 Flexchip Ag Device for shielding a transponder, method for producing a corresponding shielding and transponder provided with said shielding
US7950587B2 (en) 2006-09-22 2011-05-31 The Board of Regents of the Nevada System of Higher Education on behalf of the University of Reno, Nevada Devices and methods for storing data
EP1579394B1 (en) * 2002-11-28 2012-03-21 Hueck Folien Gesellschaft m.b.H. Security element with combined machine-recognizable characteristics

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960624U (en) * 1972-09-06 1974-05-28
US3878367A (en) * 1973-05-02 1975-04-15 Minnesota Mining & Mfg Magnetic security document and method for making same
US4237189A (en) * 1973-10-31 1980-12-02 Robert J. Deffeyes Polymodal magnetic recording media process for making and verifying the same and compositions useful therein
JPS6057130B2 (en) * 1977-01-14 1985-12-13 富士写真フイルム株式会社 Manufacturing method for multilayer magnetic recording tape
JPS53160436U (en) * 1977-05-21 1978-12-15
JPS56117336A (en) * 1980-02-19 1981-09-14 Sony Corp Manufacture of magnetic recording medium
JPS56119938A (en) * 1980-02-22 1981-09-19 Sony Corp Production of magnetic recording medium
US5480685A (en) * 1993-10-22 1996-01-02 Tomoegawa Paper Co., Ltd. Method of making a magnetic recording medium comprising two magnetic layers
DE4439455A1 (en) * 1994-11-04 1996-05-09 Basf Ag Process for the production of coatings with three-dimensional optical effects
GB2319644B (en) * 1996-11-23 2000-01-12 Central Research Lab Ltd A record carrier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796359A (en) * 1952-07-05 1957-06-18 Audio Devices Inc Production of magnetic sound recording tape
US3430200A (en) * 1967-06-30 1969-02-25 Walter W Barney Validator apparatus for magnetic credit cards and the like

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998160A (en) * 1974-04-17 1976-12-21 Emi Limited Magnetic ink printing method
US4186944A (en) 1974-04-17 1980-02-05 Emi Limited Security document
FR2277385A1 (en) * 1974-07-04 1976-01-30 Emi Ltd METHOD AND DEVICE FOR DETECTION OF MAGNETIC CONFIGURATIONS
US4038596A (en) * 1974-07-04 1977-07-26 E M I Limited Method and apparatus for authenticating a record medium consisting of applying two different strength magnetizing fields and monitoring the remanent fields
US4114029A (en) * 1974-10-16 1978-09-12 E M I Limited Magnetic recording
US4197989A (en) * 1974-10-16 1980-04-15 Emi Limited Magnetic recording
DE2752895A1 (en) * 1976-12-06 1978-06-08 Emi Ltd METHOD FOR PRODUCING A MATERIAL LAYER, THE SURFACE OF WHICH HAS A SCANABLE PATTERN, AS WELL AS A SECURITY DOCUMENT SYSTEM
US4244998A (en) 1976-12-06 1981-01-13 E M I Limited Patterned layers including magnetizable material
US4228348A (en) * 1976-12-10 1980-10-14 E M I Limited Security document and system
FR2406277A1 (en) * 1977-10-15 1979-05-11 Emi Ltd MAGNETICALLY STRUCTURED MATERIALS
EP0024800A1 (en) * 1979-08-04 1981-03-11 EMI Limited Security document and system
US4396886A (en) 1979-12-13 1983-08-02 Basf Aktiengesellschaft Document authentication by means of exchange-anisotropic magnetic material
US4438462A (en) 1979-12-13 1984-03-20 Basf Aktiengesellschaft Document identification employing exchange-anisotropic magnetic material
EP0025636A2 (en) * 1980-07-07 1981-03-25 General Kinetics, Incorporated Perpetuation of information in magnetically recorded medium
EP0025636A3 (en) * 1980-07-07 1981-06-10 General Kinetics, Incorporated Perpetuation of information in magnetically recorded medium
US4593336A (en) * 1982-05-18 1986-06-03 Emi Limited Magnetic recording
US4743490A (en) * 1986-02-24 1988-05-10 Minnesota Mining And Manufacturing Company Counterfeit-resistant magnetic recording tape
US4985614A (en) * 1987-01-16 1991-01-15 Rand Mcnally & Company Object verification apparatus and method
US4906988A (en) * 1987-01-27 1990-03-06 Rand Mcnally & Co. Object verification system and method
US5216229A (en) * 1989-06-05 1993-06-01 Rand Mcnally & Company Verifiable object having incremental key
EP0428933A2 (en) * 1989-11-16 1991-05-29 MERCK PATENT GmbH Materials coated with plate like pigmets
EP0428933A3 (en) * 1989-11-16 1992-01-02 Merck Patent Gesellschaft Mit Beschraenkter Haftung Materials coated with plate like pigmets
US5177344A (en) * 1990-10-05 1993-01-05 Rand Mcnally & Company Method and appparatus for enhancing a randomly varying security characteristic
USRE35599E (en) * 1990-10-05 1997-09-02 Docusystems, Inc. Method and apparatus for enhancing a randomly varying security characteristic
AU710207B2 (en) * 1996-01-25 1999-09-16 Central Research Laboratories Limited Method of identifying a data carrier
WO1997027565A1 (en) * 1996-01-25 1997-07-31 Central Research Laboratories Limited Method of identifying a data carrier
US6179211B1 (en) 1996-01-25 2001-01-30 Central Research Laboratories Limited Method of identifying a data carrier
WO1998015853A3 (en) * 1996-10-09 1998-09-03 Flying Null Ltd Multi-bit magnetic tag and its method of manufacture
WO1998015853A2 (en) * 1996-10-09 1998-04-16 Flying Null Limited Multi-bit magnetic tag and its method of manufacture
WO1999024942A1 (en) 1997-11-10 1999-05-20 Thorn Secure Science Limited A method of labelling an article
AU736556B2 (en) * 1997-11-10 2001-08-02 Thorn Secure Science Limited A method of labelling an article
US6832315B1 (en) 1997-11-10 2004-12-14 Thorn Secure Science Limited Method of labelling an article
WO2003032246A1 (en) * 2001-10-05 2003-04-17 Flexchip Ag Device for shielding a transponder, method for producing a corresponding shielding and transponder provided with said shielding
US7053854B2 (en) 2001-10-05 2006-05-30 Flexchip Ag Device for shielding a transponder, method for producing a corresponding shielding and transponder provided with said shielding
EP1579394B1 (en) * 2002-11-28 2012-03-21 Hueck Folien Gesellschaft m.b.H. Security element with combined machine-recognizable characteristics
US7950587B2 (en) 2006-09-22 2011-05-31 The Board of Regents of the Nevada System of Higher Education on behalf of the University of Reno, Nevada Devices and methods for storing data

Also Published As

Publication number Publication date
NL7016325A (en) 1971-05-18
NL170342C (en) 1982-10-18
DE2055357B2 (en) 1980-11-13
DE2055357A1 (en) 1971-05-27
NL170342B (en) 1982-05-17
FR2069355A5 (en) 1971-09-03
JPS4937529B1 (en) 1974-10-09
DE2055357C3 (en) 1981-08-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years