Pneumatic tire comprising cap and base and spirally wound cord

Details Pneumatic tire comprising cap and base and spirally wound cord Pneumatic tire comprising cap and base and spirally wound cord

2006-01-31

2006-01-31

Maki, Steven D. (Department: 1733)

Resilient tires and wheels

Tires, resilient

Anti-skid devices

C152S209180, C152S531000

Reexamination Certificate

active

06991014

ABSTRACT:
A pneumatic tire comprises a tread rubber disposed radially outside a tread reinforcing belt, the tread rubber includes a radially outmost cap tread rubber and a radially inner base tread rubber, wherein the base tread rubber includes a central base tread rubber centered on the tire equator and a side base tread rubber disposed on each side of the central base tread rubber, and the tread rubber having one of the following hardness distributions (a) and (b): (a) the side base tread rubber is hardest in the tread rubber, and the cap tread rubber has a hardness of from 53 to 63 degrees, the central base tread rubber has a hardness of from 45 to 60 degrees, and the side base tread rubber has a hardness of from 65 to 75 degrees; (b) the side base tread rubber is softest in the tread rubber, and the cap tread rubber has a hardness of 60 to 80 degrees, the central base tread rubber has a hardness of from 65 to 75 degrees, and the side base tread rubber has a hardness of from 45 to 60 degrees.

REFERENCES:
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patent: 5046542 (1991-09-01), Ohta et al.
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patent: 5-246212 (1993-09-01), None
patent: 8-332806 (1996-12-01), None
patent: 11 301209 (1999-11-01), None
patent: WO 00/24596 (2000-05-01), None

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