Sughrue, Rothwell, Mion, Zinn and Macpeak
Pneumatic radial tire
 An improved belt construction for a radial or semi-radial tire comprising a reinforcing belt layer including helically formed filaments is disclosed. Between main belt layers is interposed an intermediate reinforcing layer composed of a reinforcing element formed of helically formed filaments each having a tensile breaking strength of at least 140 kg/mm.sup.2 and elongation at tensile breaking strength of at least 1.2 times the smallest elongation at tensile breaking strength of the cords of the main belt layers. The intermediate reinforcing layer as a whole is extensible and compressible. 
Bridgestone Tire Company Limited
Y B B Y Y
Y10T B60C B60C Y10T Y10T
additional inventional inventional additional additional
Masaru Toshiro Yasuo
Abe Tezuka Suzuki