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:
Oct. 15, 2013
Filed:
Sep. 30, 2008
Takehiko Murata, Kobe, JP;
Takehiko Murata, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
A pneumatic tire having on-snow performance improved by increasing traction performance on snow-covered road with maintaining dry grip performance high, and comprising tread surfacehaving at least one circumferential main groovein an outer regionfacing outward of a vehicle, the circumferential main groovebeing a straight groove wherein ridge linesat which groove wall surfacesintersect with the tread surfaceextend straight, each groove wall surfacecomprising a gently-inclined upper wall surfaceU extending from the ridge lineat an angle θof 40 to 60° with respect to a normal line to tread surfaceand a steeply-inclined lower wall surfaceL extending to groove bottomat an angle θsmaller than the angle θ, and the lower wall surfaceL including projectionswhich are disposed at intervals in the circumferential direction and have a triangular cross section with slope surfaceS extending from lower end Ue of the upper wall surfaceU to groove bottomat an angle θwhich is not greater than the angle θbut is greater than the angle θ