Resilient tires and wheels – Tires – resilient – Anti-skid devices
Reexamination Certificate
2004-09-06
2010-10-19
Maki, Steven D (Department: 1791)
Resilient tires and wheels
Tires, resilient
Anti-skid devices
C152S209210, C152S209280, C152SDIG020
Reexamination Certificate
active
07814951
ABSTRACT:
A pneumatic tire which can enhance performance on snow while assuring performance in wet or dry condition is provided.A plurality of inclined lateral grooves16which extend from the tread edge12E toward the tire equatorial surface CL, being inclined with respect to the tire circumferential direction, are arranged in the tread12to establish the rotation directionality, whereby high performance in wet condition is obtained. In traveling on snow, the snow is got into the inclined lateral grooves16, resulting in a force for shearing the snow column being obtained, thus basic performance in traveling on a snow covered road surface is provided. In the land portion18between inclined lateral grooves16adjoining in the circumferential direction, convexly curved line fine grooves20and sipes22are formed on the treading-in side, whereby a great edging effect is obtained in treading in the snow, which can enhance traction performance on snow. In addition, in the land portion18, the kicking-out side is provided with less grooves than the treading-in side, having a higher rigidity, thus the land part rigidity as the entire land portion is assured, resulting in maneuvering performance in wet or dry condition being ensured.
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Supplementary European Search Report dated Sep. 22, 2008.
Bridgestone Corporation
Maki Steven D
Sughrue & Mion, PLLC
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