Black magnetic iron oxide particles having a specific dissolution of sulfur element
US7597958B2 · kind B2 · utility
1Cited by
3References
5Claims
0Family size
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Key dates
| Filing date | Feb 20, 2008 |
| Grant date | Oct 6, 2009 |
| Priority date | — |
| Expiry date | Feb 20, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a black magnetic iron oxide particles each having a polyhedral shape wherein when a percentage of dissolution of iron element based on a total amount of iron element contained in the black magnetic iron oxide particles is 50%, a percentage of dissolution of sulfur element based on a total amount of sulfur element contained in the black magnetic iron oxide particles is less than 40%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.