Appeal 2007-2234
Application 09/950,477
[25] According to Example 3,
[f]ormulation A is composed of 41 % by weight of
dry silica and 59 % by weight water. Formulation
B is composed of 30.75% by weight dry silica,
25 % by weight JONCRYL 74®, and 44.25% by
weight water. Formulation C is composed of
30.75 % by weight dry silica, 14.58 % by weight
diethylene glycol, 10 % by weight JONCRYL 74®,
0.07 % by weight biocide, and 44.6 % by weight
water. [Id., 19:32 to 20:2.]
[26] The tips spraying formulations A and B required scrubbing and more
scrubbing, respectively, to remove white deposits, while the tip
spraying formulation C was readily rinsed off with water without
signs of any plugging (id., 20:4-11).
[27] Example 4 is said to show the appearance of the deposit produced by
(1)-(3) three silica/diethylene glycol/JONCRYL 74® aqueous
solutions, (4) a silica/dietheylene glycol aqueous solution and (5) a
silica solution after three days at room temperature (id., 20:19-25).
Solutions (1)-(5) were said to have left a white skin, a translucent paste, a
white film, a clear solid and a white solid, respectively (id., Table 3)
C. Iler
[28] Iler describes modifying sols of silica particles with aluminate ions
(Iler, pp. 407-408).
[29] Aluminate-modified silica particles are stable in the neutral pH range
where unmodified silica sol gels rapidly (id., 408, ¶2).
[30] "The increased stability over a wider pH range broadens the scope of
practical uses" (id.).
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