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:
May. 03, 2011
Filed:
May. 23, 2005
Kiyoshi Ikehara, Tokyo, JP;
Kiyoshi Ikehara, Tokyo, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
Provided is a pneumatic radial tire including a carcass layer composed of a carcass plyand a spiral belt layercomposed of steel cords wound spirally substantially in parallel with each other to a tire equator surface. When the ratio of spacing Rbetween adjacent steel cords of the spiral belt layeris shown by R=(50−E×ds)/50, the ratio of spacing Ris 0.45 or less as well as the total sectional area S of the steel cords applied per 50 mm width of the spiral belt layer is 7.5 mmor less (E shows the number of steel cords applied per 50 mm width of the spiral belt layer, and ds shows the diameter (mm) of each steel cord). The number of steel cords E applied per 50 mm of width ranges from 66 to 200.