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:
Feb. 10, 2009
Filed:
Dec. 08, 2004
Masahiro Kishida, Kobe, JP;
Masahiro Kishida, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe-Shi, JP;
Abstract
A pneumatic tire comprising a tread portion having tread elements each provided with a sipe, wherein the sipe is open to a upper surface of the tread element, and has an open top end including a zigzag part and a bottom, wherein the sipe comprises: a first portion in which the zigzag part of the open top end extends to a side of the bottom in a state of being inclined to one side of a longitudinal direction of the sipe; a second portion connected to an inner side in a radial direction of the first portion, and in which the zigzag part extends to the side of the bottom in a state of being inclined in an opposite direction to the first portion; and a third portion connected to an inner side in a radial direction of the second portion, and in which the zigzag part extends to the side of the bottom in a state of being inclined in an opposite direction to the second portion, and the sipe satisfies the following relation (1):α1>α2>α3  (1) where αis a ratio (a/h) between a displacement length aof the first portion and a length hin a radial direction of the first portion, αis a ratio (a/h) between a displacement length aof the second portion direction and a length hin a radial direction of the second portion, and αis a ratio (a/h) between a displacement length aof the third portion and a length hin a radial direction of the third portion.