Appeal No. 1998-2040 Page 2
Application No. 08/420,077
metal hydroxide additive avoids nitrosamine formation in the
used antifreeze. Claim 1, the sole independent claim on
appeal, is reproduced below.
A process for recovering a glycol from a
used glycol-containing technical fluid, which
comprises adding to the used glycol-containing
technical fluid an alkali metal hydroxide and an
organic solvent which forms, with the glycol, an
azeotropic mixture which has a lower boiling
point than the glycol itself and distilling off
this azeotropic mixture, wherein the used
glycol-containing technical fluid is used
antifreeze.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Cox et al. (Cox) 3,878,055 Apr. 15,
1975
Chueh 4,057,471 Nov. 08,
1977
Claims 1 and 3-6 stand rejected under 35 U.S.C. § 103 as
being unpatentable over Chueh in view of Cox.
OPINION
We refer to the appellants' brief and reply brief and to
the examiner’s answer for the opposing viewpoints expressed by
appellants and the examiner concerning the above noted
rejection. For the reasons of record, as particularly set
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