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. 29, 2001
Filed:
Aug. 04, 1999
Kazuo Asano, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Hyogo-ken, JP;
Abstract
A run-flat tire comprises a carcass ply extending between the bead portions, and a sidewall reinforcing layer disposed axially inside said carcass ply in each sidewall portion, wherein in a normally inflated unloaded state, a profile line from a tire equator point (P) to a maximum tire section width point (D) is curved substantially along an involute curve so as to have a radius of curvature decreasing continuously from the tire equator point towards the sidewall portion, the basic circle of the involute curve is an ellipse whose major axis extends in the tire radial direction, the radial distance (h) between the tire equator point (P) and the maximum tire section width point (D) is more than 34% but less than 50% of the tire section height (H). In a x-y coordinate system which is defined in a meridian section of the tire such that: y-axis extends radially outwardly on the tire equator; x-axis extends axially outwardly in the tire axial direction; the x-y coordinates of said tire equator point (P) is (0, B); B is a radius of curvature of the profile line at the tire equator point (P), the elliptic function of the ellipse is