Appeal 2007-1902
Application 09/398,006
The appeal was heard July 11, 2007.
We affirm the decision of the Primary Examiner.
Claims 1, 3, 5, and 24 illustrate Appellants’ invention of a pneumatic
radial tire, and are representative of the claims on appeal:
1. A pneumatic radial tire comprising:
a radical carcass having at least one rubberized cord ply extending
between a pair of bead cores embedded in a pair of bead portions and
reinforcing a pair of sidewall portions and a tread portion,
a belt reinforcing the tread portion at an outside of the carcass and
consisting of three rubberized cord layers each containing steel cords
therein, an innermost cord layer and a middle cord layer among these cord
layers being a cross cord layer that cords of the layers are crossed with each
other with respect to an equatorial plane of the tire, and
one or more circumferential grooves provided in at least each side
region of the tread portion,
in which the cords of each of the innermost cord layer and the middle
cord layer have an inclination angle of 10-25° with respect to the equatorial
plane, and cords of an outermost cord layer have an inclination angle of
45-115° with respect to the equatorial plane as measured in the same
direction as in the cords of the middle layer, and the outermost cord layer
has a width extending toward an end of the tread portion over an outermost
groove edge of an outermost circumferential groove in a widthwise direction
of the tread portion and being narrower than a width of the innermost cord
layer but corresponding to 1.0-1.2 times a width of the middle cord layer and
a coating rubber for the cords of the outermost cord layer has a compression
modulus of not less than 200 kgf/cm2.
3. A pneumatic radial tire according to claim 1, wherein the
outermost cord layer has a width covering both widthwise ends of the
middle cord layer.
5. A pneumatic radial tire according to claim 3, wherein a rubber
gauge between the cord at an end portion of the middle cord layer and the
cord of the outermost cord layer adjacent thereto is not less than 0.15 time
[sic] a rubber gauge between the cord at the end portion of the middle cord
layer and the cord of the innermost cord layer adjacent thereto.
2
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