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. 13, 1989
Filed:
Dec. 23, 1987
Masahiro Takayama, Nishitama, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A pneumatic tire comprising a tread having an outer tread portion arranged at a radially outer side of the tire and composed of one kind of rubber, and an inner tread portion arranged radially inward of an outer surface of a tread wear indicator and composed of several kinds of rubbers, and a pair of sidewalls each arranged between the tread and a bead, the inner tread portion being axially divided into at least three regions and having a central region extending across an equatorial line of the tire and side end regions arranged in opposite sides of the central region, hardnesses of the rubbers of the inner tread portion being gradually increased axially from the central region to the side end region, and hardness of the rubber of an axially outermost side end region being smaller than that of the rubber of the outer tread portion.