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:
Feb. 15, 1983
Filed:
Jun. 03, 1981
Applicant:
Inventors:
Hiroshi Hirakawa, Musashino, JP;
Akio Sato, Higashimurayama, JP;
Takashi Takusagawa, Ohme, JP;
Nobumasa Ikeda, Kodaira, JP;
Assignee:
Bridgestone Tire Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60C / ; B60C / ;
U.S. Cl.
CPC ...
1523 / ; 152360 ; 1523 / ; 152374 ;
Abstract
A pneumatic radial tire having a reduced rolling resistance and particularly suitable for a passenger car, comprising a toroidal carcass, a belt layer, a bead core, a side rubber, a tread rubber, a relatively thin base rubber, and a rubber filler, wherein provision is made of a stress relieving groove composed of a depression facing toward the bead rubber at a position near the joint portion between the side rubber and the tread rubber, the base rubber having a resilience which is higher than those of the tread rubber and the bead rubber.