GB1556929A - Preparation of ferromagnetic chromium dioxide - Google Patents

Preparation of ferromagnetic chromium dioxide

Info

Publication number
GB1556929A
GB1556929A GB32011/77A GB3201177A GB1556929A GB 1556929 A GB1556929 A GB 1556929A GB 32011/77 A GB32011/77 A GB 32011/77A GB 3201177 A GB3201177 A GB 3201177A GB 1556929 A GB1556929 A GB 1556929A
Authority
GB
United Kingdom
Prior art keywords
preparation
chromium dioxide
ferromagnetic chromium
ferromagnetic
dioxide
Prior art date
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
GB32011/77A
Other languages
English (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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1556929A publication Critical patent/GB1556929A/en
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
    • G11B5/70636—CrO2
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/02—Oxides or hydrates thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Hard Magnetic Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compounds Of Iron (AREA)
GB32011/77A 1976-08-31 1977-07-29 Preparation of ferromagnetic chromium dioxide Expired GB1556929A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/719,167 US4045544A (en) 1976-08-31 1976-08-31 Process for the preparation of ferromagnetic chromium dioxide

Publications (1)

Publication Number Publication Date
GB1556929A true GB1556929A (en) 1979-12-05

Family

ID=24889010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32011/77A Expired GB1556929A (en) 1976-08-31 1977-07-29 Preparation of ferromagnetic chromium dioxide

Country Status (8)

Country Link
US (1) US4045544A (OSRAM)
JP (1) JPS609323B2 (OSRAM)
BE (1) BE857302A (OSRAM)
CA (1) CA1091919A (OSRAM)
DE (1) DE2727891C3 (OSRAM)
FR (1) FR2363520A1 (OSRAM)
GB (1) GB1556929A (OSRAM)
NL (1) NL178311C (OSRAM)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428852A (en) 1982-01-18 1984-01-31 E. I. Du Pont De Nemours And Company Continuous synthesis of chromium dioxide
US4495246A (en) * 1983-10-27 1985-01-22 Basf Aktiengesellschaft Acicular ferromagnetic chromium dioxide particles
DE3609971A1 (de) * 1986-03-25 1987-10-01 Basf Ag Verfahren zur herstellung von chrom(iii)oxid, eine vorrichtung zur durchfuehrung des verfahrens sowie die verwendung des chrom(iii)oxids als ausgangsmaterial fuer die chromdioxid-synthese
US4698220A (en) * 1986-03-28 1987-10-06 E. I. Du Pont De Nemours And Company Partitioned reduction process for ferromagnetic chromium dioxide
US4747974A (en) * 1986-03-28 1988-05-31 E. I. Dupont De Nemours And Company Mixed Cr2 O3 paste for CrO2 synthesis
US4769165A (en) * 1987-01-20 1988-09-06 E. I. Du Pont De Nemours And Company Process for synthesis of ferromagnetic chromium dioxide
DE3819779A1 (de) * 1988-06-10 1989-12-21 Bayer Ag Verbessertes chromoxidgruen, verfahren zu seiner herstellung und dessen verwendung
EP0546342B1 (en) * 1991-11-14 1996-08-14 Matsushita Electric Industrial Co., Ltd. A self-metabolic functional material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956955A (en) * 1960-02-12 1960-10-18 Du Pont Ferromagnetic chromium oxide and method of making
US3278263A (en) * 1964-11-27 1966-10-11 Du Pont Ferromagnetic chromium dioxide and preparation thereof
JPS5021992B1 (OSRAM) * 1968-02-17 1975-07-26
JPS4828277B1 (OSRAM) * 1970-12-14 1973-08-30

Also Published As

Publication number Publication date
DE2727891B2 (de) 1980-04-24
BE857302A (fr) 1978-01-30
FR2363520B1 (OSRAM) 1981-07-24
NL178311B (nl) 1985-10-01
CA1091919A (en) 1980-12-23
US4045544A (en) 1977-08-30
JPS609323B2 (ja) 1985-03-09
DE2727891C3 (de) 1980-12-11
NL178311C (nl) 1986-03-03
DE2727891A1 (de) 1978-03-02
JPS5329598A (en) 1978-03-18
FR2363520A1 (fr) 1978-03-31
NL7708419A (nl) 1978-03-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930729