Black magnetic iron oxide particles having a specific...

Details Black magnetic iron oxide particles having a specific... Black magnetic iron oxide particles having a specific...

2008-02-20

2009-10-06

Le, H. (Holly) T (Department: 1794)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C428S702000, C428S704000, C428S900000

Reexamination Certificate

active

07597958

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%.

REFERENCES:
patent: 6638674 (2003-10-01), Komoto et al.
patent: 6653035 (2003-11-01), Komoto et al.
patent: 6780555 (2004-08-01), Uchida et al.
patent: 2007/0254157 (2007-11-01), Uchida et al.

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