FR2397049B1 - - Google Patents

Info

Publication number
FR2397049B1
FR2397049B1 FR7819812A FR7819812A FR2397049B1 FR 2397049 B1 FR2397049 B1 FR 2397049B1 FR 7819812 A FR7819812 A FR 7819812A FR 7819812 A FR7819812 A FR 7819812A FR 2397049 B1 FR2397049 B1 FR 2397049B1
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
FR7819812A
Other languages
French (fr)
Other versions
FR2397049A1 (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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of FR2397049A1 publication Critical patent/FR2397049A1/en
Application granted granted Critical
Publication of FR2397049B1 publication Critical patent/FR2397049B1/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
    • G11B5/712—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 surface treatment or coating of magnetic particles
    • 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
FR7819812A 1977-07-04 1978-07-03 PROCESS FOR MANUFACTURING MAGNETIC POWDERS AND POWDERS AND SUPPORTS EQUIPPED WITH SUCH POWDERS THUS OBTAINED Granted FR2397049A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7964577A JPS5413997A (en) 1977-07-04 1977-07-04 Magnetic recording medium and its manufacture

Publications (2)

Publication Number Publication Date
FR2397049A1 FR2397049A1 (en) 1979-02-02
FR2397049B1 true FR2397049B1 (en) 1982-04-02

Family

ID=13695840

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7819812A Granted FR2397049A1 (en) 1977-07-04 1978-07-03 PROCESS FOR MANUFACTURING MAGNETIC POWDERS AND POWDERS AND SUPPORTS EQUIPPED WITH SUCH POWDERS THUS OBTAINED

Country Status (5)

Country Link
JP (1) JPS5413997A (en)
DE (1) DE2829344A1 (en)
FR (1) FR2397049A1 (en)
GB (1) GB2001942B (en)
NL (1) NL7807250A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2903593C3 (en) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Cobalt-doped ferrimagnetic iron oxides and processes for their production
DE2905351A1 (en) * 1979-02-13 1980-08-21 Basf Ag METHOD FOR PRODUCING NEEDLE-SHAPED COBAL-CONTAINING, MAGNETIC IRON OXIDE
DE2905352A1 (en) * 1979-02-13 1980-08-21 Basf Ag METHOD FOR PRODUCING NEEDLE-SHAPED COBAL-CONTAINING MAGNETIC IRON OXIDE
EP0099259A1 (en) * 1982-07-09 1984-01-25 Konica Corporation Process for producing surface-treated ferromagnetic particles
DE3631194A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
DE3631193A1 (en) * 1986-09-13 1988-03-24 Bayer Ag MAGNETIC IRON OXIDE PIGMENTS AND METHOD FOR THE PRODUCTION THEREOF
CN103694746B (en) * 2013-12-27 2015-11-18 广东维诺珠光颜料有限公司 A kind of preparation method of multifunctional magnetic synthetic mica pearlescent pigment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4810994B1 (en) * 1969-07-26 1973-04-09
JPS5321119B2 (en) * 1973-03-20 1978-06-30
DE2243231C2 (en) * 1972-09-01 1982-01-28 Basf Ag, 6700 Ludwigshafen Process for the preparation of cobalt-doped γ-iron (III) oxide
DE2639250C2 (en) * 1976-09-01 1985-12-12 Basf Ag, 6700 Ludwigshafen Process for the production of acicular, cobalt-doped magnetic iron oxide
DE2705967C2 (en) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Process for the production of acicular cobalt-containing magnetic iron oxide

Also Published As

Publication number Publication date
JPS5413997A (en) 1979-02-01
JPS6114642B2 (en) 1986-04-19
DE2829344A1 (en) 1979-01-25
NL7807250A (en) 1979-01-08
FR2397049A1 (en) 1979-02-02
GB2001942A (en) 1979-02-14
DE2829344C2 (en) 1989-03-02
GB2001942B (en) 1982-02-03

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Legal Events

Date Code Title Description
ST Notification of lapse