Appeal No. 2004-1862
Application No. 09/784,041 Page 2
2. A heavy duty pneumatic tire, wherein said heavy
duty pneumatic tire employs in its bead portion a
chafer rubber composition,
wherein in said chafer rubber composition 55-75
parts by weight of carbon black having a nitrogen
absorption specific surface area of 70-120 m2/g and
0.2-0.5 parts by weight of 1, 3-bis
(citraconimidomethyl) benzene are blended with respect
to 100 part by weight of a rubber component including
30-50 parts by weight of natural rubber and/or
polyisoprene rubber and 50-70 parts weight of
polybutadiene rubber which has a syndiotactic crystal
content of at least 5% by weight, wherein a ratio S/A
of a blended amount of sulfur S and a blended amount of
vulcanization accelerator A is in a range between 0.25
and 0.5.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Matsue et al. (Matsue) 5,420,193 May 30, 1995
Majumdar et al. (Majumdar) 5,503,940 Apr. 02, 1996
Carter 5,807,918 Sep. 15, 1998
Muraoka et al. (Muraoka) 5,859,142 Jan. 12, 1999
Claim 2 stands rejected under 35 U.S.C. § 103(a) as being
unpatentable over Muraoka in view of Majumdar, Matsue and Carter.
We refer to the brief and reply brief and to the answer for
a complete exposition of the opposing viewpoints expressed by
appellant and the examiner concerning the issues before us on
this appeal.
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