NL7405420A - - Google Patents
Info
- Publication number
- NL7405420A NL7405420A NL7405420A NL7405420A NL7405420A NL 7405420 A NL7405420 A NL 7405420A NL 7405420 A NL7405420 A NL 7405420A NL 7405420 A NL7405420 A NL 7405420A NL 7405420 A NL7405420 A NL 7405420A
- Authority
- NL
- Netherlands
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
- G11B5/70663—Preparation processes specially adapted therefor, e.g. using stabilising agents
-
- 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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US355241A US3873462A (en) | 1973-04-27 | 1973-04-27 | Cobalt modified iron oxides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL7405420A true NL7405420A (enExample) | 1974-10-29 |
Family
ID=23396754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL7405420A NL7405420A (enExample) | 1973-04-27 | 1974-04-22 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3873462A (enExample) |
| JP (1) | JPS5051999A (enExample) |
| DE (1) | DE2419800A1 (enExample) |
| NL (1) | NL7405420A (enExample) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3931025A (en) * | 1973-09-21 | 1976-01-06 | Bayer Aktiengesellschaft | Magnetic iron oxides with improved orientability and a process for their production |
| US4108787A (en) * | 1974-12-20 | 1978-08-22 | Fuji Photo Film Co., Ltd. | Process for producing ferromagnetic iron oxide |
| DE2705967C2 (de) * | 1977-02-12 | 1990-01-04 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von nadelförmigem kobalthaltigem magnetischem Eisenoxid |
| US4292294A (en) * | 1979-05-09 | 1981-09-29 | Basf Wyandotte Corporation | Yellow pigments stable at high temperatures |
| JPS5860505A (ja) * | 1981-10-06 | 1983-04-11 | Ishihara Sangyo Kaisha Ltd | 磁気記録材料用針状α−ＦｅＯＯＨの製造方法 |
| JPS6028025A (ja) * | 1983-07-26 | 1985-02-13 | Fuji Photo Film Co Ltd | 磁気記録媒体 |
| EP0265189B1 (en) * | 1986-10-17 | 1992-08-05 | Toda Kogyo Corp. | Acicular magnetic iron oxide particles, process for preparing the same, and magnetic recording media using such particles |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3081264A (en) * | 1958-04-09 | 1963-03-12 | Matake Kurokawa | Method of preparing a magnetic recorder powder |
| US3117933A (en) * | 1959-06-12 | 1964-01-14 | Bayer Ag | Process for the production of needleshaped, cobalt-containing gamma-ferric oxide crystalline particles |
| US3573980A (en) * | 1968-02-19 | 1971-04-06 | Minnesota Mining & Mfg | Method of making magnetic particles and recording tape |
| US3720618A (en) * | 1970-05-08 | 1973-03-13 | Toda Kogyo Corp | Method of producing a powder of cobalt-containing needle-like shaped gamma-ferric oxide particles as magnetic recording material |
| US3671435A (en) * | 1971-07-16 | 1972-06-20 | Ampex | Cobalt doped gamma ferric oxide |
-
1973
- 1973-04-27 US US355241A patent/US3873462A/en not_active Expired - Lifetime
-
1974
- 1974-04-22 NL NL7405420A patent/NL7405420A/xx unknown
- 1974-04-24 DE DE2419800A patent/DE2419800A1/de active Pending
- 1974-04-27 JP JP49048254A patent/JPS5051999A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5051999A (enExample) | 1975-05-09 |
| US3873462A (en) | 1975-03-25 |
| DE2419800A1 (de) | 1974-11-14 |