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:
Aug. 17, 1993
Filed:
Sep. 24, 1990
Applicant:
Inventors:
Satoshi Nakashio, Kodaira, JP;
Kiyohito Kawasaki, Akigawa, JP;
Assignee:
Bridgestone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60C / ; B60C / ; B60C / ;
U.S. Cl.
CPC ...
152451 ; 152556 ;
Abstract
A heavy duty pneumatic radial tire comprises at least one carcass ply reinforced with steel cords substantially arranged at an angle of 90.degree. with respect to an equator of the tire and wound around a bead core from inside of the tire toward outside thereof. In this tire, the steel cord is made from steel wires each having a tensile strength of 330-400 kg/mm.sup.2 and a cementite lamellar distance of 120-190 .ANG., a residual stress of whose is compression stress at a depth within a range of 1/10 to 1/5.5 of a wire diameter from the surface of the steel wire.