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. 13, 2014
Filed:
Aug. 31, 2009
Naoya Ochi, Higashimurayama, JP;
Naoya Ochi, Higashimurayama, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
To significantly improve performances on ice by optimizing a tread pattern. This pneumatic tire has, in at least a part of a tread portion, a block group Gformed by arranging blocksclose to each other, the blocks being defined by groovesand being independent of each other, and when a symbol P (mm) stands for a reference pitch length of the blocks in the block group G, a symbol W (mm) stands for a width of the block group G, a symbol a (pieces) stands for the number of the blocksexisting in a reference zone Z of the block group G, the reference zone being comparted by the reference pitch length P and the width W, and a symbol N (%) stands for a negative ratio in the reference zone Z, a block number density S, which is the number of the blocks per unit of an actual ground contact area of the block group Gand given by a formula of S=a/{P×W×(1−N/100)}, is set within a range of not less than 0.003 (pieces/mm) but not more than 0.04 (pieces/mm).