NL171846C - MAGNETIC REGISTRATION MATERIAL; PROCESS FOR PREPARING NEEDLE GAMMA FERRIOXIDE PARTICLES. - Google Patents

MAGNETIC REGISTRATION MATERIAL; PROCESS FOR PREPARING NEEDLE GAMMA FERRIOXIDE PARTICLES.

Info

Publication number
NL171846C
NL171846C NLAANVRAGE7203540,A NL7203540A NL171846C NL 171846 C NL171846 C NL 171846C NL 7203540 A NL7203540 A NL 7203540A NL 171846 C NL171846 C NL 171846C
Authority
NL
Netherlands
Prior art keywords
ferrioxide
gamma
particles
registration material
preparing needle
Prior art date
Application number
NLAANVRAGE7203540,A
Other languages
Dutch (nl)
Other versions
NL7203540A (en
NL171846B (en
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of NL7203540A publication Critical patent/NL7203540A/xx
Publication of NL171846B publication Critical patent/NL171846B/en
Application granted granted Critical
Publication of NL171846C publication Critical patent/NL171846C/en

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
NLAANVRAGE7203540,A 1971-03-16 1972-03-16 MAGNETIC REGISTRATION MATERIAL; PROCESS FOR PREPARING NEEDLE GAMMA FERRIOXIDE PARTICLES. NL171846C (en)

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 (en) 1971-03-16 1973-04-11 CRYSTALLINE GAMMA IRON (III) OXYDE PARTICLES, THE PROCESS FOR THEIR MANUFACTURING AND THEIR USE IN HIGH PERFORMANCE MAGNETIC RECORDING MATERIALS

Publications (3)

Publication Number Publication Date
NL7203540A NL7203540A (en) 1972-09-19
NL171846B NL171846B (en) 1982-12-16
NL171846C true NL171846C (en) 1983-05-16

Family

ID=25764960

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7203540,A NL171846C (en) 1971-03-16 1972-03-16 MAGNETIC REGISTRATION MATERIAL; PROCESS FOR PREPARING NEEDLE GAMMA FERRIOXIDE PARTICLES.

Country Status (6)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020807B2 (en) * 1976-02-13 1985-05-23 富士写真フイルム株式会社 magnetic recording medium
FR2487326A1 (en) * 1980-07-24 1982-01-29 Kodak Pathe PROCESS FOR THE PREPARATION OF ACIDIC PARTICLES OF MAGNETIC IRON OXIDE
DE3029203A1 (en) * 1980-08-01 1982-04-01 Basf Ag, 6700 Ludwigshafen NEEDLE-SHAPED MAGNETIC IRON OXIDE AND METHOD FOR THE PRODUCTION THEREOF
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 (en) * 1951-04-10 1953-10-01 Agfa Ag Fuer Photofabrikation Process for the production of magnetogram carriers
US3082067A (en) * 1959-04-28 1963-03-19 Bayer Ag Process for the production of isometric ferromagnetic gamma-ferric oxide
DE1204644B (en) * 1962-03-30 1965-11-11 Basf Ag Process for the production of acicular iron oxide yellow, alpha-OH, which is particularly suitable as a starting material for the production of highly coercive ª † iron (III) oxide
FR1357866A (en) * 1963-03-29 1964-04-10 Basf Ag Process for the production of acicular alpha yellow iron oxide, particularly suitable as a starting material for the production of highly coercive iron-iii-gamma oxide
UST867010I4 (en) * 1969-04-28 1969-10-21 Defensive publication

Also Published As

Publication number Publication date
DE2144553A1 (en) 1972-10-12
DE2318271A1 (en) 1974-10-31
FR2129841A1 (en) 1972-11-03
NL7203540A (en) 1972-09-19
NL171846B (en) 1982-12-16
BE780654A (en) 1972-09-14
DD97325A5 (en) 1973-04-20
FR2129841B1 (en) 1975-02-21
DE2144553C2 (en) 1982-02-04
CH558759A (en) 1975-02-14

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Legal Events

Date Code Title Description
BC A request for examination has been filed
V1 Lapsed because of non-payment of the annual fee