Appeal No. 94-3608
Application 07/844,980
This is an appeal from the decision of the examiner finally
rejecting claims 1 through 4, 6 through 8, 10, 12 through 16, 18,
19 and 22 through 25, which are the only claims remaining of
record in the application.
The appellants' invention is directed to a heavy-duty
pneumatic radial tire. The subject matter before us on appeal is
illustrated by reference to claim 1.
1. A heavy-duty pneumatic radial tire comprising a tread
wherein a pair of upper and lower rubber layers having mutually
different moduli of 300% elasticity at room temperature are
laminated, said upper rubber layer being located on a tread
surface side of said tire and having a smaller modulus of 300%
elasticity at room temperature than said lower rubber layer, said
tread comprising:
plural main grooves extending in said one rubber layer
located on said tread surface side of said tire, along the
circumferential direction of said tire, and defining land
portions adjacent a groove wall of each of said main grooves,
a narrow-width fine groove extending in said one of said
pair of upper and lower rubber layers which is located on a tread
surface side of said tire, along a circumferential direction of
said tire, a radius of curvature of a bottom of said fine groove
being 1.5 mm or less and a width of said fine groove being set in
a range of not less than 15% and not more than 30% of a width of
one of said main grooves,
wherein a shortest distance between said bottom of said fine
groove and a boundary surface bordering between said pair of
upper and lower rubber layers is set to be within a range of 1 mm
and 3 mm.
THE REFERENCES
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