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:
Jul. 10, 2012
Filed:
Jul. 18, 2007
Hiroyuki Yokokura, Kodaira, JP;
Humihiro Shiraishi, Kodaira, JP;
Hiroyuki Yokokura, Kodaira, JP;
Humihiro Shiraishi, Kodaira, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
This invention provides a pneumatic tire provided with a carcass () comprised of one or more carcass plies formed by covering plural reinforcing cords arranged in parallel with a coating rubber and a pair of side reinforcing rubber layers () each having a crescent shape in section and disposed at an inside of the carcass, wherein ride comfort during usual running and durability during run-flat running are improved by applying a cord including a polyketone fiber and satisfying conditions of equation (I): σ≧−0.01×E+1.2 and equation (II): σ≧0.02 [wherein σ is a heat shrinkage stress (cN/dtex) at 177° C. and E is an elastic modulus (cN/dtex) at 25° C. under a load of 49 N] to the reinforcing cord and a rubber composition having a loss tangent (tan δ) at 25° C. and 1% strain of less than 0.12 and a viscosity (G') at 130° C. during unvulcanization of not less than 50 MPa to the coating rubber.