Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Reexamination Certificate
2011-07-12
2011-07-12
Le, Hoa (Department: 1788)
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
C427S215000, C428S403000, C428S404000
Reexamination Certificate
active
07976812
ABSTRACT:
A core-shell silica having a high sphericity and a narrow particle distribution and a method for easily producing the core-shell silica which includes dispersing substantially non-porous silica core particles having a sphericity of at least 0.8 and a coefficient of variation of at most 0.2 in a dispersion medium containing an alcohol and water in the presence of a surfactant to prepare a dispersion; adding a silica material to the dispersion and reacting the silica material under a condition of pH of from 8 to 13 to form a shell precursor containing silica and the surfactant on the surface of each silica core particle; and removing the surfactant from the shell precursor to form a porous shell.
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The protest letter under 37 CFR 291, faxed Nov. 1, 2010.
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Yamada Kazuhiko
Yamada Kenji
Asahi Glass Company Limited
Le Hoa
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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