Patents by Inventor Seiichi Hirayama

Seiichi Hirayama 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).

  • Spirally winding a belt reinforcing layer for a pneumatic radial tire at a higher density beneath the groove areas
    Patent number: 5178704
    Abstract: A pneumatic radial tire including a belt reinforcing layer or layers formed by spirally continuously winding a single organic fiber cord in a manner such that before the molding of an unvulcanized tire, the belt reinforcing layer or an outer or outermost belt reinforcing layer has a greater density of winding of the organic fiber cord in its regions located beneath or inner to a main groove-forming rib of a mold than in its remaining region, whereby after the molding of the unvulcanized tire, the cord density in the regions of the belt reinforcing layer or the outer or outermost belt reinforcing layer beneath or inner to the main groove-forming rib is set to be substantially identical with the cord density in its remaining region; and a process for the production of such tire.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: January 12, 1993
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Ryoji Hanada, Seiichi Hirayama, Katsuhide Kawaguchi