Secondary agglomerates of magnetic metal particles for magnetic recording and process for producing the same
US6783608B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Apr 24, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Jul 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/714
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Secondary agglomerates of magnetic metal particles for magnetic recording, have a sodium content of not more than 20 ppm and a calcium content of not more than 40 ppm, an average particle diameter of 300 to 800 &mgr;m and an upper limit of particle diameters of 2,000 &mgr;m, and comprise magnetic metal primary particles having an average major axis diameter of 0.05 to 0.25 &mgr;m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.