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. 03, 1990
Filed:
Feb. 29, 1988
Katsuyuki Harakon, Higashiyamato, JP;
Ken Kijima, Kodaira, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A pneumatic radial tire for use in heavy duty vehicles such as an airplane and so on comprises at least one carcass ply as a tire body reinforcement, at least two belt layers as a tread reinforcement, and a tread provided with a pair of main grooves extending circumferentially of the tread at a position ranging from the side end of the tread within 15.about.40% of tread ground contact width. In this tire, the tread is composed of a tread rubber satisfying a requirement that modulus at 100.degree. C. under 100% elongation of tread rubber constituting each side portion of the tread is lower by a range of 30.about.80% than that of tread rubber constituting a central portion of the tread.