Appeal No. 1997-1992 Page 7
Application No. 08/115,388
cycloalkyl substituted N,N'-dinitrosophenylenediamines. See
In re Zletz, 893 F.2d 319, 321-22, 13 USPQ2d 1320, 1322 (Fed.
Cir. 1989).
Turning our attention to the examiner's rejection, we
note that Otsuki and Watanabe are each generally concerned
with inhibiting polymerization of acrylic acids or their
derivatives during purification thereof, Otsuki specifically
being directed to such inhibition during distillation of
acrylic or methacrylic acid. Otsuki discloses that
phenothiazine, appellants' required composition component (b),
has polymerization inhibition activity in the liquid phase and
that hydroquinone or hydroquinone monomethyl ether,
appellants' optional component (c), have polymerization
inhibition activity in a distillation column when each are
used alone. Otsuki further teaches that using hydroquinone
monomethyl ether together with benzoquinone provides longer
polymerization suppression than either used alone (Table IV).
Otsuki does not teach the use of the claimed N,N'-
dinitrosophenylenediamine compounds alone or in combination
with other compounds for polymerization suppression as claimed
herein. While Watanabe discloses N,N'-
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