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:
Feb. 21, 2012
Filed:
Aug. 23, 2007
Kiyoshi Ikehara, Tokyo, JP;
Kiyoshi Ikehara, Tokyo, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A steel cord has a multi-twist structure in which N (N=2 to 8) strandsare twisted, each strandbeing formed by twisting a plurality of element wiresand having a substantially elliptical cross-section, wherein d/d>1.08 is satisfied, where the major diameter of the strandis represented by dand the minor diameter is represented by d, and εdefined by the following equation: ε=√(−b/2+√(b/4−c))−1 (in the equation, b represents −1+π(−4R+d)/P, c represents πdk(4πR+P)/P, R represents (D−d)/2, k represents tan(π/2−π/N), and d represents (d+d)/2) satisfies ε>0.005, where the diameter of a circle circumscribing the cord is represented by D (mm) and the twist pitch of the cord is represented by P (mm).