Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2007-05-08
2010-12-28
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C423S598000, C423S611000, C423S612000, C423S069000, C023S300000
Reexamination Certificate
active
07858066
ABSTRACT:
The disclosure provides a process for preparing nanocrystalline titanium dioxide, in particular rutile nanocrystalline titanium dioxide, comprising: (a) precipitating a mixture comprising hydrated titanium oxide and a separable filtering agent; (b) filtering the precipitated mixture to form a filter cake comprising the precipitated hydrated titanium dioxide and a separable filtering agent, (c) calcining the precipitated hydrated titanium oxide and separable filtering agent at a temperature of greater than about 300° C.; and (d) removing the separable filtering agent thereby recovering titanium dioxide particles.
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E.I. du Pont de Nemours and Company
Liao Diana J
Vanoy Timothy C
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