Resilient tires and wheels – Tires – resilient – Anti-skid devices
Reexamination Certificate
2007-07-03
2007-07-03
Maki, Steven D. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Anti-skid devices
C152S209180, C152S209220, C152S902000, C152SDIG020
Reexamination Certificate
active
10940801
ABSTRACT:
A pneumatic tire includes a tread portion provided in a tread face thereof with tread elements each provided with at least one zigzag sipe, a cap tread rubber defining the tread face, and a base tread rubber disposed radially inside the cap tread rubber, wherein the zigzag sipe comprises zigzag segments which are alternating circumferentially-oriented segments and an amplitude center line of zigzag of the zigzag sipe is inclined at an angle (theta) of from 0 to 45 degrees with respect to the tire circumferential direction, and the zigzag sipe has a bottom including alternating deep parts and shallow parts in comparison with the level of the boundary between the cap tread rubber and base tread rubber.
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Maki Steven D.
Sumitomo Rubber Industries Ltd.
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