Resilient tires and wheels – Tires – resilient – Anti-skid devices
Reexamination Certificate
2005-05-17
2005-05-17
Maki, Steven D. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Anti-skid devices
C152S209150, C152S209180, C152S209280, C152SDIG003
Reexamination Certificate
active
06892775
ABSTRACT:
A pneumatic radial tire for all-season passenger car comprises a tread with a tread block pattern defined by plural slant grooves and at least one circumferential center groove and consisting of a central zone having a width corresponding to 30-60% of a tread width and a pair of side zones located on both sides of the central zone, wherein the slant grooves comprise steeply slant grooves and gently slant grooves each having a given shape, and the number of the gently slant grooves is made two times or more than the number of the steeply slant grooves, and the block is provided with at least one sipe, and each of the blocks defined by the circumferential center groove and the steeply slant grooves is chamfered from a tapered top end over a given range toward a longitudinal direction of the block.
REFERENCES:
patent: 5234042 (1993-08-01), Kuhr et al.
patent: 5423364 (1995-06-01), Himuro
patent: 5609699 (1997-03-01), Himuro
patent: 5837074 (1998-11-01), Uemura
patent: 627332 (1994-12-01), None
patent: 688685 (1995-12-01), None
patent: 705718 (1996-04-01), None
patent: 5-319025 (1993-12-01), None
patent: 6-40215 (1994-02-01), None
Bridgestone Corporation
Maki Steven D.
Sughrue & Mion, PLLC
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