Appeal No. 96-0216
Application 07/842,915
of Blardone with claims 8, 9, 17 and 18 standing further rejected
in view of Mallow.
We reverse.
The claimed invention is directed to a method of making a
clear, soluble silicate solution from biogenetic silica. The
biogenetic silica is obtained from the burning of biogenetic
materials such as
rice hulls, rice stalks, esquitum (horsetail weed), bagasse,
certain bamboo palm leaves, particularly palmyra, pollen and
the like. The burning of the biogenetic material is done
under controlled conditions so that substantially all of the
silica is in an amorphous rather than a crystalline state
[Specification, p. 6, line 30- p. 7, line 1].
The biogenetic silica is dissolved in a strong alkali solution
(pH 12) and heated in a closed container to a temperature not
higher than 275EF in the presence of a solid carbonaceous
material.
According to the specification, sodium silicate is
conventionally made by fusing high purity soda ash and
silica sand in furnaces at temperatures of 1300E to 1500EC
and higher to produce a solid glass. The liquid is made by
dissolving the glass with steam and hot water. This is
known as the open hearth process which is the foundation of
all commercial processes for making sodium silicate today
[Specification, p. 1, line 32- p. 2, line 7].
Nakagawa discloses a method of making a silicate solution
wherein silica sand, silica clay, an alkaline aqueous solution
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