The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2009
Filed:
May. 26, 2004
Takayuki Fukunaga, Kodaira, JP;
Takayuki Fukunaga, Kodaira, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A pneumatic tire which has improved drainage property on a wet road surface and improved uneven wear resistance and steering stability on a dry road surface while enhancing drainage property on a wet road surface. The tire has at least a pair of circumferential groovesdisposed at a tread portion. An inner land portionand an outer land portionare defined by outermost circumferential grooves. A plurality of transverse groovesare disposed on at least the outer land portionand the outer land portionis divided and formed into a large number of blocks by these transverse grooves. The width wof the groove bottomof the outermost circumferential grooveis narrower than the opening width w. The groove bottom extends with inclination with respect to the tire circumferential direction so that it substantially continues to the transverse groove between the adjacent transverse grooves. The groove bottom forms the zigzag shape as a whole. The outermost circumferential groovehas chamfered partson each of the inner and the outer groove wallswhich is inclined with certain angles θ, θfrom the opening end edgetoward the groove bottom, respectively. The chamfered widths c, cof the chamfered parts are gradually increased in the opposite orientations in the circumferential direction.