Resilient tires and wheels – Tires – resilient – Anti-skid devices
Reexamination Certificate
2011-08-09
2011-08-09
Maki, Steven D (Department: 1747)
Resilient tires and wheels
Tires, resilient
Anti-skid devices
C152S209220, C152S209240, C152S901000
Reexamination Certificate
active
07992608
ABSTRACT:
A pneumatic tire where the positions of the groove deepest portions (33btm) in the circumferential grooves (33) vary in a predetermined cycle along the circumferential direction in a width direction of the tread within the circumferential grooves (33). Moreover, depth direction positions, where a groove bottom surface of the circumferential groove (33) contacts with each of perpendicular lines (perpendicular line P1, perpendicular line P2) which are perpendicular or approximately perpendicular to a tread surface and which pass respectively through edges (edge portion11eg, edge portion12eg) of the land portions on a side of each of the circumferential grooves of ribs, as well as angles which are formed by the perpendicular lines and a section line of a cross-section of the groove bottom surface in the width direction of the tread surface vary in the predetermined cycle along the circumferential direction. In the pneumatic tire, uneven wear of the tire caused by lateral force applied in a width direction of a tread is suppressed and wet performance is improved.
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patent: 4865099 (1989-09-01), Goergen
patent: 5246049 (1993-09-01), Ramcke et al.
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Machine translation for Japan 09-011708.
Machine translation for Japan 2001-219714 (no date).
European Search Report dated Feb. 13, 2009 (3 pages).
Office Action JP2005-515032 Mar. 9, 2010 with English Translation.
Bridgestone Corporation
Maki Steven D
Sughrue & Mion, PLLC
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