Appeal No. 1998-1149
Application No. 08/406,946
This appealed subject matter is adequately illustrated by
independent claim 1 which reads as follows:
1. A method for reclaiming a metal sulfate-
containing waste sulfuric acid solution comprising
the steps of extracting titanium ions from the waste
sulfuric acid solution by contacting the waste
sulfuric acid solution with an organic solvent
effective for extracting titanium ions from the
waste sulfuric acid solution and subsequently
subjecting the waste sulfuric acid solution obtained
after the step of extracting to a diffusive dialysis
treatment.
The references set forth below are relied upon by the
examiner as evidence of obviousness:
Aoki et al. (Aoki) EP 0 368 203 May 16, 1990
Mikami et al. (Mikami) EP 0 541 002 May 12, 1993
All of the claims on appeal are rejected under 35 U.S.C.
§ 103 as being unpatentable over Aoki in view of Mikami.
For the reasons set forth below, we will sustain the
rejection of independent claim 1, but not the rejection of
independent claim 2 or of claims 4 and 5 which depend from
claim 2.
We share the examiner’s conclusion that it would have
been obvious to combine the applied reference teachings such
that Aoki’s diffusion dialysis step is preceded by Mikami’s
2
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