Resilient tires and wheels – Tires – resilient – Anti-skid devices
Reexamination Certificate
2004-09-29
2009-12-29
Maki, Steven D (Department: 1791)
Resilient tires and wheels
Tires, resilient
Anti-skid devices
C152S209210, C152S209230, C152SDIG020, C152S902000
Reexamination Certificate
active
07637295
ABSTRACT:
Disclosed is a pneumatic tire which is allowed to increase block stiffness not only during braking and driving but also during cornering, and is allowed thereby to compatibly enhance tire performances both during braking and driving and during cornering. The pneumatic tire of the present invention is one where a plurality of longitudinal grooves extending in a tire circumferential direction and a plurality of lateral grooves extending in a tire widthwise direction are provided in a tread portion, a plurality of blocks are defined by these longitudinal and lateral grooves, and a plurality of sipes extending in the tire widthwise direction are provided to each of the blocks, wherein, with regard to each of the sipes, a zigzag shape is formed on a tread surface, bent portions ranging in the tire widthwise direction while bent in the tire circumferential direction are formed inside the block at at least two positions in the tire radial direction, and a zigzag shape with an amplitude in the tire radial direction is formed in each of the bent portions.
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International Search Report, Dec. 28, 2004.
Hashimoto Yoshimasa
Kishizoe Isamu
Greer Burns & Crain Ltd.
Maki Steven D
The Yokohama Rubber Co. Ltd.
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