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. 03, 1991
Filed:
Jan. 19, 1990
Applicant:
Inventor:
Hisao Ushikubo, Kodaira, JP;
Assignee:
Bridgestone Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60C / ;
U.S. Cl.
CPC ...
1522 / ;
Abstract
To improve high-speed durability of the pneumatic tire formed with a directional tread such that transversal grooves are arranged into a herringbone pattern at regular intervals along the tire circumferential direction, the U-shaped cross section of each of the transversal grooves is formed in such a way that a radius (R.sub.1) of curvature of a step-out side corner between a side wall and a bottom of each transversal groove which is first brought into contact with the ground along a tire rotating direction is determined smaller than that (R.sub.2) of a kick-out side corner therebetween which is afterward brought into contact with the ground at a ratio of about 2 to 5.