JPS4810994B1 - - Google Patents

Info

Publication number
JPS4810994B1
JPS4810994B1 JP44059086A JP5908669A JPS4810994B1 JP S4810994 B1 JPS4810994 B1 JP S4810994B1 JP 44059086 A JP44059086 A JP 44059086A JP 5908669 A JP5908669 A JP 5908669A JP S4810994 B1 JPS4810994 B1 JP S4810994B1
Authority
JP
Japan
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.)
Pending
Application number
JP44059086A
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 filed Critical
Priority to JP44059086A priority Critical patent/JPS4810994B1/ja
Priority to GB3545070A priority patent/GB1318579A/en
Priority to DE19702036612 priority patent/DE2036612C2/de
Publication of JPS4810994B1 publication Critical patent/JPS4810994B1/ja
Pending 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

Landscapes

  • Hard Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Record Carriers (AREA)
JP44059086A 1969-07-26 1969-07-26 Pending JPS4810994B1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP44059086A JPS4810994B1 (ja) 1969-07-26 1969-07-26
GB3545070A GB1318579A (en) 1969-07-26 1970-07-22 Methods of making acicular cobalt-modified ypsilon-fe2o3 powder
DE19702036612 DE2036612C2 (de) 1969-07-26 1970-07-23 Verfahren zur Herstellung eines nadelförmigen, mit Kobalt modifizierten Maghemitpulvers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44059086A JPS4810994B1 (ja) 1969-07-26 1969-07-26

Publications (1)

Publication Number Publication Date
JPS4810994B1 true JPS4810994B1 (ja) 1973-04-09

Family

ID=13103164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP44059086A Pending JPS4810994B1 (ja) 1969-07-26 1969-07-26

Country Status (3)

Country Link
JP (1) JPS4810994B1 (ja)
DE (1) DE2036612C2 (ja)
GB (1) GB1318579A (ja)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1482157A (en) * 1974-05-06 1977-08-10 Pfizer Cobalt acicular gamma ferric oxide
JPS5853493B2 (ja) * 1975-07-02 1983-11-29 富士写真フイルム株式会社 キヨウジセイフンマツノセイホウ
JPS608606B2 (ja) * 1975-07-02 1985-03-04 富士写真フイルム株式会社 強磁性粉末の製法
JPS5814729B2 (ja) * 1975-08-01 1983-03-22 富士写真フイルム株式会社 キヨウジセイフンマツノセイゾウホウホウ
DE2633597C2 (de) * 1976-07-27 1983-01-13 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von nadel- bis prismenförmigen ferrimagnetischen Eisenoxidpigmenten zur magnetischen Signalaufzeichnung
DE2650890C2 (de) * 1976-11-06 1985-12-12 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem, magnetischem Eisenoxid
JPS5413997A (en) * 1977-07-04 1979-02-01 Sony Corp Magnetic recording medium and its manufacture
JPS54122664A (en) 1978-03-16 1979-09-22 Kanto Denka Kogyo Kk Production of magnetic powder for magnetic recording based on iron
JPS54122663A (en) 1978-03-16 1979-09-22 Kanto Denka Kogyo Kk Production of magnetic powder for magnetic recording based on iron
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
DE2905351A1 (de) 1979-02-13 1980-08-21 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem, magnetischem eisenoxid
DE2905352A1 (de) 1979-02-13 1980-08-21 Basf Ag Verfahren zur herstellung von nadelfoermigem kobalthaltigem magnetischem eisenoxid
JPS6011233A (ja) * 1983-06-29 1985-01-21 Fuji Photo Film Co Ltd コバルト変性強磁性酸化鉄の製法
DE3631193A1 (de) * 1986-09-13 1988-03-24 Bayer Ag Magnetische eisenoxidpigmente und verfahren zu ihrer herstellung
DE3910782C2 (de) * 1988-12-24 2003-08-28 Toda Kogyo Corp Verfahren zur Herstellung von magnetischen Eisenoxiden und so erhaltene Pigmente

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3278440A (en) * 1960-11-22 1966-10-11 William J Schuele Shaped fine particle ferrites and method for their preparation

Also Published As

Publication number Publication date
DE2036612A1 (de) 1971-02-18
DE2036612C2 (de) 1983-08-04
GB1318579A (en) 1973-05-31

Similar Documents

Publication Publication Date Title
AU2270770A (ja)
AU465413B2 (ja)
JPS4810994B1 (ja)
AU429630B2 (ja)
FR2047369A5 (ja)
AU450150B2 (ja)
AU2355770A (ja)
AU442375B2 (ja)
AU470301B1 (ja)
AU5113869A (ja)
AU470661B1 (ja)
AU414607B2 (ja)
AU425297B2 (ja)
AU442535B2 (ja)
AU442380B2 (ja)
AU442463B2 (ja)
AT308690B (ja)
AU410358B2 (ja)
AU442554B2 (ja)
AU417208B2 (ja)
AU442538B2 (ja)
AU5077469A (ja)
CS148408B1 (ja)
AR203167Q (ja)
AU1036070A (ja)