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:
Dec. 18, 1984
Filed:
May. 25, 1983
Applicant:
Inventors:
Yujiro Umezawa, Higashimurayama, JP;
Yoshio Suzuki, Higashimurayama, JP;
Teruo Miura, Akigawa, JP;
Kiyohito Kawasaki, Akigawa, JP;
Assignee:
Bridgestone Tire Company Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B60C / ; B60C / ; D02G / ;
U.S. Cl.
CPC ...
152359 ; 1523 / ; 57902 ; 57213 ; 57230 ;
Abstract
A pneumatic radial tire having an improved durable life is disclosed. In the pneumatic radial tire, a metal cord used in the carcass ply is characterized by having a layer construction of 3+9+1 wherein three filaments are twisted together to form a core, nine filaments each having the same diameter as in the filament for the core are twisted around the core to form a second layer and a single filament is wrapped around the second layer, and limiting a twisting angle .alpha. of the second layer to a range of 72.0.degree..ltoreq..alpha..ltoreq.78.0.degree..