FR2199177B1 - - Google Patents

Info

Publication number
FR2199177B1
FR2199177B1 FR7332184A FR7332184A FR2199177B1 FR 2199177 B1 FR2199177 B1 FR 2199177B1 FR 7332184 A FR7332184 A FR 7332184A FR 7332184 A FR7332184 A FR 7332184A FR 2199177 B1 FR2199177 B1 FR 2199177B1
Authority
FR
France
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
FR7332184A
Other languages
French (fr)
Other versions
FR2199177A1 (en
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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
Priority claimed from JP9023072A external-priority patent/JPS5326314B2/ja
Priority claimed from JP9022972A external-priority patent/JPS5411919B2/ja
Priority claimed from JP9023272A external-priority patent/JPS5326316B2/ja
Priority claimed from JP9023372A external-priority patent/JPS5326317B2/ja
Priority claimed from JP9024472A external-priority patent/JPS5326318B2/ja
Priority claimed from JP9023172A external-priority patent/JPS5326315B2/ja
Priority claimed from JP9477472A external-priority patent/JPS5325118B2/ja
Priority claimed from JP9477372A external-priority patent/JPS5326319B2/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of FR2199177A1 publication Critical patent/FR2199177A1/fr
Application granted granted Critical
Publication of FR2199177B1 publication Critical patent/FR2199177B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/706—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 characterised by the composition of the magnetic material
    • G11B5/70626—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 characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—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 characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70652—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 characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
    • G11B5/70668—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 characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant
    • G11B5/70673—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 characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant containing Co
FR7332184A 1972-09-07 1973-09-06 Cobalt substd gamma-ferric oxide magnetic powder - modified with a halide to increase coercive force and residual induction and diminish the temp dependence Granted FR2199177A1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP9022972A JPS5411919B2 (enExample) 1972-09-07 1972-09-07
JP9023272A JPS5326316B2 (enExample) 1972-09-07 1972-09-07
JP9023372A JPS5326317B2 (enExample) 1972-09-07 1972-09-07
JP9024472A JPS5326318B2 (enExample) 1972-09-07 1972-09-07
JP9023172A JPS5326315B2 (enExample) 1972-09-07 1972-09-07
JP9023072A JPS5326314B2 (enExample) 1972-09-07 1972-09-07
JP9477472A JPS5325118B2 (enExample) 1972-09-20 1972-09-20
JP9477372A JPS5326319B2 (enExample) 1972-09-20 1972-09-20

Publications (2)

Publication Number Publication Date
FR2199177A1 FR2199177A1 (en) 1974-04-05
FR2199177B1 true FR2199177B1 (enExample) 1976-06-18

Family

ID=27572838

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7332184A Granted FR2199177A1 (en) 1972-09-07 1973-09-06 Cobalt substd gamma-ferric oxide magnetic powder - modified with a halide to increase coercive force and residual induction and diminish the temp dependence

Country Status (1)

Country Link
FR (1) FR2199177A1 (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8100014A (nl) * 1981-01-06 1982-08-02 Philips Nv Magnetisch registratie element alsmede methoden voor de vervaardiging ervan.

Also Published As

Publication number Publication date
FR2199177A1 (en) 1974-04-05

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Legal Events

Date Code Title Description
ST Notification of lapse