Appeal No. 2001-0080
Application No. 08/577,217
thickness (0.05 to 0.076 mm) and contains, inter alia, at least
15% by weight of conductive carbon black. (Page 2, line 88 to
page 3, line 3.)
Teeple describes a radial pneumatic tire having a silica-
rich tread compound in which the filler material, which
constitutes approximately 35% by weight of the total weight of
the tire, has at least 50% by weight of silica. (Column 4,
lines 32-57.) Teeple further teaches that the tire tread has an
electrical discharge ring 20, which is positioned so that
distance B as shown in Figure 1 is preferably 7% of the tread
width TW. (Column 5, lines 21-28.) In addition, Teeple teaches
that the discharge ring 20 has a thickness of about 0.20 to
about 1.0 mm and that the volume resistivity is about 107 to
about 108 Ω·cm. (Column 5, lines 41-48.)
Krishnan describes a sulfur cured rubber composition
containing a dispersion of a particular electrically conductive
carbon black which, on a frequency sensitive basis, exhibits a
relatively linear electrical conductivity response to variations
of pressure applied to the rubber composition. (Column 1, lines
7-12.) The conductive carbon black is said to have a surface
area characterized by an iodine absorption number (ASTM D1510)
in a range of about 220 to about 300, a relatively "high
structure" characterized by a dibutylphthalate value (ASTM 2414)
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