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:
Jun. 18, 1991
Filed:
Nov. 01, 1989
The Yokohama Rubber Co., Ltd., Tokyo, JP;
Abstract
A heavy duty pneumatic radial tire including between a tread and at least one carcass layer, at least two belt layers, wherein an outermost belt layer disposed most closely to the tread out of all belt layers comprises a steel cord which has a cord structure of 2+7 made of an element wire having a carbon content of 0.77 to 0.92% by weight and a diameter d of 0.28 to 0.40 mm and which has a tenacity at break of (1700.about.2050)d.sup.1.872 (kgf/cord) and a ratio of an elongation at break .epsilon. to P.L.E., .epsilon./P.L.E., of at least 30, and a coat rubber having a 50% modulus of 10 to 40 kg/cm.sup.2, and wherein the outermost belt layer has a thickness of at least 1.67 times the minor diameter but at greatest 1.79 times the major diameter, of the steel cord.