Pneumatic tire having tread with blocks having obtuse angle...

Details Pneumatic tire having tread with blocks having obtuse angle... Pneumatic tire having tread with blocks having obtuse angle...

2008-01-29

2008-01-29

Maki, Steven D. (Department: 1791)

Resilient tires and wheels

Tires, resilient

Anti-skid devices

C152S209240, C152S209270

Reexamination Certificate

active

07322390

ABSTRACT:
A tread surface, the tire rotational direction of which is specified in one direction, has a center region. Blocks having obtuse-angled corner portions and acute-angled corner portions are defined in the center region by at least one first circumferential groove extending in a circumferential direction of the tire on one side of the tire centerline, and first lateral grooves which extend outwardly in a widthwise direction of the tire from the first circumferential groove so as to incline towards a direction of reverse rotation of the tire and are disposed at predetermined intervals in the tire circumferential direction. Groove wall surfaces located on both sides of the obtuse-angled corner portion of each block facing to the first circumferential groove are inclined such that the inclination angles thereof are gradually greater towards the obtuse-angled corner portion and are maximum at the obtuse-angled corner portion.

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PCT International Search Report for PCT/JP03/15184 mailed on Mar. 9, 2004.

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