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:
Apr. 17, 1984
Filed:
Apr. 13, 1983
Masanobu Takahashi, Iruma, JP;
Bridgestone Tire Company, Ltd., Tokyo, JP;
Abstract
A heavy duty pneumatic tire having an improved durability is disclosed. This tire comprises a carcass of a bias structure composed of at least 12 rubberized laminated ply layers each containing organic fiber cords embedded therein, and divided into three inner, middle and outer ply groups by three bead cores, the cords of which are crossed with each other, as a reinforcement for a toroidal casing inclusive of a tread. In a region extending from an upper area of a bead portion of the casing within a range of 0.15 to 0.45 times a tire height as measured from a bead base of the tire, at least an average cord distance between adjacent ply layers at the middle and outer ply groups is made substantially wider than at the inner ply group and a cord distance between adjacent ply layers at the outer ply group is made substantially not more than at the middle ply group.