Patents by Inventor Yoshinori Hunayama

Yoshinori Hunayama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Rubber composition for use as a tire tread
    Patent number: 5227424
    Abstract: A rubber composition for tire treads is disclosed which is designed to exhibit high resistance to skidding on wet, icy and snowy roads. A selected rubber blend of styrene-butadiene rubber and natural rubber and/or polyisoprene rubber is combined with a selected carbon black of specified specific surface areas and also with a selected softener of specified viscosity-gravity constants. The styrene-butadiene rubber consists essentially of two styrene-butadiene block copolymers each having varied styrene and vinyl contents and a specified transition temperature width, one block having a higher glass transition temperature than the other.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: July 13, 1993
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Akinori Tokieda, Shinji Kawakami, Yasushi Kikuchi, Makoto Misawa, Yoshinori Hunayama