Appeal No. 94-2973
Application No. 07/956,529
(a)(ii) of claim 1 (“polymeric anionic dispersants and salts
thereof”). Thus, Shioji fails to disclose a method of preparing
a magnesium hydroxide slurry comprising “forming an aqueous
mixture of” magnesium hydroxide, polymeric anionic dispersants
and alkali metal salts.
Rejection of claim 22
Claim 22 is rejected under 35 U.S.C. § 102(b) as anticipated
by or, in the alternative, under 35 U.S.C. § 103 as obvious over
Shioji. We affirm this rejection.
Claim 22 relates to a method of preparing an aqueous slurry
of magnesium hydroxide comprising forming an aqueous mixture of
specific amounts of (i) magnesium hydroxide, (ii) one or more
polymeric anionic dispersants and salts thereof, and (iii) “one
or more water-soluble alkali metal salts.” In contrast to claim
1, claim 22 does not exclude phosphate salts. Therefore, the
water-soluble condensed phosphates (b) disclosed in Shioji are
“water-soluble alkali metal salts” within the scope of claim 22.
See col. 6, lines 6-8 (typical examples of the water-soluble
condensed phosphate (b) include sodium, potassium, lithium, and
other alkali metal salts). The fact that the method of claim 22
“requires the use of the combination of one or more alkali metal
salts and one or more polymeric anionic dispersants which do not
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