FR2157896B1 - - Google Patents

Info

Publication number
FR2157896B1
FR2157896B1 FR7237202A FR7237202A FR2157896B1 FR 2157896 B1 FR2157896 B1 FR 2157896B1 FR 7237202 A FR7237202 A FR 7237202A FR 7237202 A FR7237202 A FR 7237202A FR 2157896 B1 FR2157896 B1 FR 2157896B1
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
FR7237202A
Other versions
FR2157896A1 (fr
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.)
Ampex Corp
Original Assignee
Ampex 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 Ampex Corp filed Critical Ampex Corp
Publication of FR2157896A1 publication Critical patent/FR2157896A1/fr
Application granted granted Critical
Publication of FR2157896B1 publication Critical patent/FR2157896B1/fr
Expired 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
FR7237202A 1971-10-27 1972-10-20 Expired FR2157896B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19315571A 1971-10-27 1971-10-27

Publications (2)

Publication Number Publication Date
FR2157896A1 FR2157896A1 (fr) 1973-06-08
FR2157896B1 true FR2157896B1 (fr) 1975-01-03

Family

ID=22712458

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7237202A Expired FR2157896B1 (fr) 1971-10-27 1972-10-20

Country Status (8)

Country Link
US (1) US3748270A (fr)
JP (1) JPS52558B2 (fr)
BE (1) BE790376A (fr)
DE (1) DE2252564B2 (fr)
FR (1) FR2157896B1 (fr)
GB (1) GB1347615A (fr)
IT (1) IT966309B (fr)
NL (1) NL154355B (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5225959B2 (fr) * 1972-01-13 1977-07-11
US3974246A (en) * 1972-05-26 1976-08-10 Corning Glass Works Method of improving the magnetic properties of cobalt substituted magnetite
US4179387A (en) * 1974-03-12 1979-12-18 Fuji Photo Film Co., Ltd. Process for producing magnetic FE oxide
JPS5941289B2 (ja) * 1974-03-12 1984-10-05 富士写真フイルム株式会社 磁性酸化鉄の製造方法
US4067755A (en) * 1974-06-25 1978-01-10 Tdk Electronics Company, Ltd. Method of making powdered magnetic iron oxide material
JPS604566B2 (ja) * 1974-06-28 1985-02-05 富士写真フイルム株式会社 強磁性粉末及びこれを使用した磁気記録体の安定化方法
US4108787A (en) * 1974-12-20 1978-08-22 Fuji Photo Film Co., Ltd. Process for producing ferromagnetic iron oxide
DE2639250C2 (de) * 1976-09-01 1985-12-12 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem magnetischem Eisenoxid
DE2650890C2 (de) * 1976-11-06 1985-12-12 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem, kobaltdotiertem, magnetischem Eisenoxid
DE2705967C2 (de) * 1977-02-12 1990-01-04 Basf Ag, 6700 Ludwigshafen Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid
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
NL7902902A (nl) * 1978-04-17 1979-10-19 Montedison Spa Werkwijze ter bereiding van magnetische poeders op basis van gamma-fe203, de aldus verkregen poeders en magnetische banden, die deze poeders bevatten.
US4276183A (en) * 1978-10-25 1981-06-30 Pfizer Inc. Cobalt modified magnetic iron oxide
DE2903593C3 (de) * 1979-01-31 1982-05-06 Bayer Ag, 5090 Leverkusen Kobalt-dotierte ferrimagnetische Eisenoxide und Verfahren zu deren Herstellung
US4842759A (en) * 1983-04-25 1989-06-27 Daikin Industries, Ltd. Acicular process for producing particulate material
US5151206A (en) * 1983-04-25 1992-09-29 Daikin Industries, Ltd. Acicular iron carbide particulate material and process for producing same
DE3345531A1 (de) * 1983-12-16 1985-06-27 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung kobalthaltiger, isotroper magnetischer eisenoxide
DE3345532A1 (de) * 1983-12-16 1985-06-27 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung kobalthaltiger, isotroper magnetischer eisenoxide
US5186854A (en) * 1990-05-21 1993-02-16 The United States Of America As Represented By The Secretary Of The Navy Composites having high magnetic permeability and method of making
DE4319572A1 (de) * 1993-06-14 1994-12-15 Toda Kogyo Corp Co-haltige Eisenoxidpigmente, Verfahren zu ihrer Herstellung und diese enthaltende magnetische Medien
CN114843530A (zh) * 2022-03-29 2022-08-02 中北大学南通智能光机电研究院 一种钴-铁/泡沫铁的制备方法

Also Published As

Publication number Publication date
JPS4851296A (fr) 1973-07-18
DE2252564B2 (de) 1975-05-07
DE2252564A1 (de) 1973-05-10
JPS52558B2 (fr) 1977-01-08
NL154355B (nl) 1977-08-15
GB1347615A (en) 1974-02-27
US3748270A (en) 1973-07-24
NL7214030A (fr) 1973-05-02
IT966309B (it) 1974-02-11
BE790376A (fr) 1973-02-15
FR2157896A1 (fr) 1973-06-08

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Legal Events

Date Code Title Description
TP Transmission of property