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:
Sep. 29, 1992
Filed:
Dec. 14, 1989
Makoto Takagi, Hiratsuka, JP;
The Yokohama Rubber Co., Ltd., Tokyo, JP;
Abstract
A heavy-duty pneumatic radial tire having a bead portion comprising a carcass layer having its respective end portions turned up about a bead core from the inner side to the outer side of the tire and at least two reinforcing layers disposed along a portion of the carcass layer, which tire comprises an inner reinforcing layer having a tenacity of from 30 kg/mm of layer width inclusive to 80 kg/mm of layer width not inclusive, incorporated on the inner side of the bead portion, and an outer reinforcing layer having a greater tenacity than the inner reinforcing layer and of at least 80 kg/mm, of layer width incorporated on the outside of the bead portion, wherein cords in the inner reinforcing layer and those in the outer reinforcing layer are inclined in a same direction relative to the radial direction of the tire, and when mounted on a vehicle the direction of inclination of the cords in the inner and the outer reinforcing layers is opposite the direction of forward rotation of the tire.