Appeal No. 2000-1019
Application No. 08/623,852
values.1 The appealed subject matter is illustrated by
representative independent claim 1, which is the broadest
independent claim.
1. A process for recovering metal values from a
metal containing material including metal values being
recovered and one or more additional metal values
comprising:
digesting the metal containing material in a
sulfuric acid solution comprising:
sulfuric acid;
a reducing agent to render a metal value
insoluble; and
a carbon source;
for a period of time sufficient to solubilize the metal
values being recovered and render the one or more
additional metal values insoluble;
heating the digestion mixture for a period of time
sufficient to attain 75-95°C; and
separating the resulting solution from the
remaining solids.
The references relied upon by the examiner as evidence of
obviousness are:
Pazdej 4,332,777 Jun. 1, 1982
Bender 5,232,490 Aug. 3, 1993
1We note that the term “chlorides” on page 1, line 18 of the subject
specification, appears to be in error. The proper term seems to be
“fluorides.” This is deserving of correction should further prosecution be
pursued.
2
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