Pneumatic tire with tread having blocks

Resilient tires and wheels – Tires – resilient – Anti-skid devices

Reexamination Certificate

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Details

C152S209170, C152S209210, C152SDIG020

Reexamination Certificate

active

07438101

ABSTRACT:
The present invention aims to improve the wet performance while securing steering stability and holding down degradations in noise performance to minimum, and for this purpose, a pneumatic tire in which blocks are disposed at intervals at a tread portion thereof is arranged in that concave blocks with stepped concave portions that extend along block side edges, which face circumferential main grooves, and having a depth from a block top surface that corresponds to 20 to 70% of a block height are provided. The concave portions have a length in a tire circumferential direction of 40 to 95% of a length of the block side edges in the tire circumferential direction and a width in a tire axial direction of 2 to 20 mm.

REFERENCES:
patent: 4854358 (1989-08-01), Takeuchi
patent: 4955415 (1990-09-01), Takeuchi et al.
patent: 5031680 (1991-07-01), Kajikawa et al.
patent: 5957180 (1999-09-01), Kuramochi et al.
patent: 2002/0124922 (2002-09-01), Carra et al.
patent: 2004/0069389 (2004-04-01), Ratliff, Jr.
patent: 2004/0256041 (2004-12-01), Ratliff, Jr.
patent: 1-215603 (1989-08-01), None
patent: 3-57704 (1991-03-01), None
patent: 2001-121926 (2001-05-01), None
patent: 2001-146104 (2001-05-01), None
patent: 2001-191736 (2001-07-01), None
patent: 2001-322407 (2001-11-01), None
patent: 2001-354011 (2001-12-01), None
patent: 2001-354011 (2001-12-01), None
patent: WO 03/013881 (2003-02-01), None

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