Appeal No. 2001-2094
Application 09/203,894
Rasberger discloses that 1,2-dihydroquinolines were known in
the art as antioxidants for polymeric plastics and, in
combination with phenolic antioxidants, as antioxidants for
lubricants (col. 1, lines 22-29). Rasberger states that “[i]t
has now been found that monomeric 1,2,3,4-tetrahydroquinolines on
their own, and particularly in combination with phenolic
antioxidants, exhibit in lubricants an excellent antioxidation
action with a satisfactory corrosion behaviour” (col. 1,
lines 35-35). Rasberger teaches that the antioxidant composition
can contain further antioxidants, the disclosed examples
including secondary diarylamines ((2,2,3,3-tetramethyl-butyl)-
phenyl-"- and $-naphthylamines, and phenyl-"-naphthylamine)
which fall within the appellants’ claim 1 (col. 4, lines 56-68).
Rasberger does not disclose the dihydroquinolines recited in the
appellants’ claim 1, or teach that the disclosed
dihydroquinolines can be used in combination with a secondary
diarylamine antioxidant.
Evans discloses that dihydroquinoline derivatives which fall
within the appellants’ claim 1 were known in the art as
antioxidants for industrial products, in particular natural and
synthetic rubber, as preservatives for feedstuffs and, in
combination with organic halides, as color formers in
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