Process for making nanoporous ultrafine alpha-alumina powder

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

Reexamination Certificate

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C423S625000, C216S088000

Reexamination Certificate

active

08080231

ABSTRACT:
The present invention provides nanoporous α-alumina powders comprising powder comprising interconnected α-alumina primary particles having an average particle size of less than about 100 nm and an interpenetrated array of pores or voids. The invention also provides nanosized α-alumina powders comprising α-alumina particles having an average particle size of less than about 100 nm and slurries, particularly aqueous slurries, which comprise nanosized α-alumina powders of the invention. The invention further provides methods of manufacturing nanoporous α-alumina powders and nanosized α-alumina powders of the invention and methods of polishing using slurries of the invention.

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