FR2129841B1 - - Google Patents

Info

Publication number
FR2129841B1
FR2129841B1 FR7109090A FR7109090A FR2129841B1 FR 2129841 B1 FR2129841 B1 FR 2129841B1 FR 7109090 A FR7109090 A FR 7109090A FR 7109090 A FR7109090 A FR 7109090A FR 2129841 B1 FR2129841 B1 FR 2129841B1
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
FR7109090A
Other languages
French (fr)
Other versions
FR2129841A1 (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.)
Kodak Pathe SA
Original Assignee
Kodak Pathe SA
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 Kodak Pathe SA filed Critical Kodak Pathe SA
Priority to FR7109090A priority Critical patent/FR2129841A1/fr
Priority to DE2144553A priority patent/DE2144553C2/de
Priority to DD162319A priority patent/DD97325A5/xx
Priority to JP46071314A priority patent/JPS5915482B1/ja
Priority to CH364472A priority patent/CH558759A/fr
Priority to BE780654A priority patent/BE780654A/xx
Priority to NLAANVRAGE7203540,A priority patent/NL171846C/xx
Priority to IT2196572A priority patent/IT950288B/it
Publication of FR2129841A1 publication Critical patent/FR2129841A1/fr
Priority to DE2318271A priority patent/DE2318271A1/de
Priority to US05/522,810 priority patent/US4255492A/en
Application granted granted Critical
Publication of FR2129841B1 publication Critical patent/FR2129841B1/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
    • 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
    • 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
    • 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
    • G11B5/70657—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 with a skin
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/01—Particle morphology depicted by an image
    • C01P2004/03—Particle morphology depicted by an image obtained by SEM
FR7109090A 1969-09-25 1971-03-16 Magnetic registering material - with layer of needle shaped gamma ferric oxide with alkaline earth metal ions distributed over th Granted FR2129841A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
FR7109090A FR2129841A1 (en) 1971-03-16 1971-03-16 Magnetic registering material - with layer of needle shaped gamma ferric oxide with alkaline earth metal ions distributed over th
DE2144553A DE2144553C2 (de) 1971-03-16 1971-09-06 Kristallines γ-Eisen (III)oxid, Verfahren zu dessen Herstellung sowie Verwendung desselben
DD162319A DD97325A5 (enExample) 1971-03-16 1971-09-14
JP46071314A JPS5915482B1 (enExample) 1971-03-16 1971-09-16
CH364472A CH558759A (fr) 1971-03-16 1972-03-13 Oxyde ferrique.
BE780654A BE780654A (fr) 1971-03-16 1972-03-14 Nouvel oxyde ferrique
NLAANVRAGE7203540,A NL171846C (nl) 1971-03-16 1972-03-16 Magnetisch registratiemateriaal; werkwijze ter bereiding van naaldvormige gamma-ferrioxyde deeltjes.
IT2196572A IT950288B (it) 1971-03-16 1972-03-16 Ossido ferrico per registrazioni magnetiche
DE2318271A DE2318271A1 (de) 1971-03-16 1973-04-11 Kristalline gamma-eisen(iii)oxydteilchen, verfahren zu ihrer herstellung und ihre verwendung in hochleistungs-magnetaufzeichnungsmaterialien
US05/522,810 US4255492A (en) 1969-09-25 1974-11-11 Magnetic recording crystals, process for producing same, and magnetic recording webs using same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7109090A FR2129841A1 (en) 1971-03-16 1971-03-16 Magnetic registering material - with layer of needle shaped gamma ferric oxide with alkaline earth metal ions distributed over th
DE2318271A DE2318271A1 (de) 1971-03-16 1973-04-11 Kristalline gamma-eisen(iii)oxydteilchen, verfahren zu ihrer herstellung und ihre verwendung in hochleistungs-magnetaufzeichnungsmaterialien

Publications (2)

Publication Number Publication Date
FR2129841A1 FR2129841A1 (en) 1972-11-03
FR2129841B1 true FR2129841B1 (enExample) 1975-02-21

Family

ID=25764960

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7109090A Granted FR2129841A1 (en) 1969-09-25 1971-03-16 Magnetic registering material - with layer of needle shaped gamma ferric oxide with alkaline earth metal ions distributed over th

Country Status (6)

Country Link
BE (1) BE780654A (enExample)
CH (1) CH558759A (enExample)
DD (1) DD97325A5 (enExample)
DE (2) DE2144553C2 (enExample)
FR (1) FR2129841A1 (enExample)
NL (1) NL171846C (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020807B2 (ja) * 1976-02-13 1985-05-23 富士写真フイルム株式会社 磁気記録体
FR2487326A1 (fr) * 1980-07-24 1982-01-29 Kodak Pathe Procede de preparation de particules aciculaires d'oxyde de fer magnetique
DE3029203A1 (de) * 1980-08-01 1982-04-01 Basf Ag, 6700 Ludwigshafen Nadelfoermiges magnetisches eisenoxid und verfahren zu seiner herstellung
US4778719A (en) * 1986-08-25 1988-10-18 Eastman Kodak Company Particulate magnetic recording media and method of manufacture thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE891625C (de) * 1951-04-10 1953-10-01 Agfa Ag Fuer Photofabrikation Verfahren zur Herstellung von Magnetogrammtraegern
US3082067A (en) * 1959-04-28 1963-03-19 Bayer Ag Process for the production of isometric ferromagnetic gamma-ferric oxide
DE1204644B (de) * 1962-03-30 1965-11-11 Basf Ag Verfahren zur Herstellung von insbesondere als Ausgangsmaterial fuer die Herstellung von hochkoerzitivem ª†-Eisen(III)-oxyd geeignetem nadelfoermigem Eisenoxydgelb, alpha-OH
FR1357866A (fr) * 1963-03-29 1964-04-10 Basf Ag Procédé pour la production d'oxyde de fer jaune alpha aciculaire, convenant notamment comme matière de départ pour la production d'oxyde de fer-iii-gamma hautement coercitif
UST867010I4 (en) * 1969-04-28 1969-10-21 Defensive publication

Also Published As

Publication number Publication date
NL171846C (nl) 1983-05-16
DE2144553A1 (de) 1972-10-12
DD97325A5 (enExample) 1973-04-20
NL7203540A (enExample) 1972-09-19
NL171846B (nl) 1982-12-16
DE2318271A1 (de) 1974-10-31
DE2144553C2 (de) 1982-02-04
FR2129841A1 (en) 1972-11-03
CH558759A (fr) 1975-02-14
BE780654A (fr) 1972-09-14

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Legal Events

Date Code Title Description
ST Notification of lapse