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:
Sep. 11, 2018
Filed:
Dec. 10, 2014
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Ryoji Kojima, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-shi, Hyogo, JP;
Abstract
A studless winter tire that has enhanced performance on ice and snow both initially and after degradation while maintaining good abrasion resistance is provided. The studless winter tire includes: a cap tread formed from a rubber composition A; and a base tread formed from a rubber composition B. The studless winter tire satisfies the following formulas (1) and (2): (1) a×c/100<b×d/100; and (2) a≥8, where a represents the softener content (% by mass) based on 100% by mass of the rubber composition A; b represents the softener content (% by mass) based on 100% by mass of the rubber composition B; c represents the percentage by mass (% by mass) of the cap tread based on the entire tread; and d represents the percentage by mass (% by mass) of the base tread based on the entire tread.