Appeal 2007-2097
Application 10/746,644
(Id. at p. 2).
3) Alexander’s specification states that the processing of titanium-
bearing ores produces significant quantities of impurity metal
chlorides. (Spec., p. 1).
4) Alexander’s specification states that the impurities,
predominantly iron chloride salts, must be isolated and removed prior
to processing into a salable product. (Id.).
5) Alexander’s specification also states that conventional methods
of dealing with accumulated waste solids from a chloride route
titanium dioxide process, such as filtering to permit landfilling, are
costly. (Id.).
B. Prior Art
1. Tate, U.S. Patent 3,817,859
6) Tate describes a method for disposing of effluent waste streams
by injecting them into subterranean formations. (Tate, co1. 1, ll. 11-
17).
7) Tate’s method inhibits the formation of solid precipitates,
which plug subterranean formations, by lowering the pH of the waste
stream. (Id.).
5
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