GB1544628A - Marking of a magnetic record medium - Google Patents

Marking of a magnetic record medium

Info

Publication number
GB1544628A
GB1544628A GB18615/75A GB1861575A GB1544628A GB 1544628 A GB1544628 A GB 1544628A GB 18615/75 A GB18615/75 A GB 18615/75A GB 1861575 A GB1861575 A GB 1861575A GB 1544628 A GB1544628 A GB 1544628A
Authority
GB
United Kingdom
Prior art keywords
marking
record medium
magnetic record
magnetic
medium
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
GB18615/75A
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
Priority to GB18615/75A priority Critical patent/GB1544628A/en
Publication of GB1544628A publication Critical patent/GB1544628A/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
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
GB18615/75A 1976-04-30 1976-04-30 Marking of a magnetic record medium Expired GB1544628A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB18615/75A GB1544628A (en) 1976-04-30 1976-04-30 Marking of a magnetic record medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18615/75A GB1544628A (en) 1976-04-30 1976-04-30 Marking of a magnetic record medium

Publications (1)

Publication Number Publication Date
GB1544628A true GB1544628A (en) 1979-04-25

Family

ID=10115491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18615/75A Expired GB1544628A (en) 1976-04-30 1976-04-30 Marking of a magnetic record medium

Country Status (1)

Country Link
GB (1) GB1544628A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024800A1 (en) * 1979-08-04 1981-03-11 EMI Limited Security document and system
WO1985002480A1 (en) * 1983-12-02 1985-06-06 Gnt Automatic A/S A magnetic recording member and a method of preparing a magnetic recording member

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024800A1 (en) * 1979-08-04 1981-03-11 EMI Limited Security document and system
WO1985002480A1 (en) * 1983-12-02 1985-06-06 Gnt Automatic A/S A magnetic recording member and a method of preparing a magnetic recording member
EP0146056A2 (en) * 1983-12-02 1985-06-26 Gnt Automatic A/S A magnetic recording member and a method of preparing a magnetic recording member
EP0146056A3 (en) * 1983-12-02 1988-05-11 Gnt Automatic A/S A magnetic recording member and a method of preparing a magnetic recording member

Similar Documents

Publication Publication Date Title
GB1547009A (en) Magnetic recording medium
GB2008307B (en) Magnetic recording medium
JPS53129606A (en) Magnetic recording medium
JPS52132807A (en) Magnetic recording media
JPS5342007A (en) Magnetic recording media
JPS53134406A (en) Magnetic recording medium
GB1544628A (en) Marking of a magnetic record medium
JPS534507A (en) Magnetic recording media
JPS52154607A (en) Magnetic recording media
JPS52127308A (en) Magnetic recording media
JPS5351708A (en) Magnetic recording media
JPS5342005A (en) Magnetic recording media
JPS52141206A (en) Magnetic recording media
JPS52141207A (en) Magnetic recording media
JPS5378098A (en) Magnetic recording medium
JPS533806A (en) Magnetic recording media
JPS52127311A (en) Magnetic recording media
JPS52152707A (en) Magnetic recording media
JPS52110609A (en) Magnetic recording media
JPS534511A (en) Magnetic recording media
JPS534510A (en) Magnetic recording media
JPS5342704A (en) Magnetic recording media
JPS5333605A (en) Magnetic recording media
JPS53116116A (en) Magnetic recording medium
JPS534508A (en) Magnetic recording media

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee