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:
Jan. 07, 2014
Filed:
May. 27, 2008
Shinichi Miyazaki, Kobe, JP;
Shinichi Miyazaki, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
The heat resistance of carcass cords is enhanced, whereby the runflat durability is enhanced. A pneumatic tire has a carcassand a tread-reinforcing cord layerdisposed radially outward of the carcass, the carcasscomprising a carcass plyA in which carcass cordsof aramid fiber are arranged at an angle of 45 to 90° with respect to the tire circumferential direction and are covered with a topping rubber, preferable carcass cordshave a two-bundle twisted structure that two bundles of first-twisted filaments are subjected to final twist, and preferable carcass cordshave a twist factor T of 0.5 to 0.7 represented by the equation (1):×√{square root over ({(0.125×/2)/ρ})}×10  (1)in which N is the number of final twists per 10 cm, D is a total nominal dtex (fineness) of a cord, and ρ is a specific gravity of a cord material.