Patents by Inventor Katsutoshi OKI

Katsutoshi OKI 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).

  • STRING SET, MAIN STRING, AND CROSS STRING
    Publication number: 20190118045
    Abstract: A string set is a string set strung on a racket as a main string and a cross string, and is configured to include a first string strung as any one of the main string and the cross string and has a small friction force and a small diameter and a second string strung as another one of the main string and the cross string and has a larger friction force and a larger diameter than the diameter and the surface friction force of the first string. This distributes functions to the first string and the second string to obtain both the hairpin performance, which is improved by the large surface friction force and outer diameter of the string, and the cut smash performance, which is improved by the small surface friction force and outer diameter of the string, at the same time.
    Type: Application
    Filed: February 22, 2017
    Publication date: April 25, 2019
    Applicant: YONEX CO., LTD.
    Inventors: Katsutoshi OKI, Shinichiro CHIBA, Keisuke OZAWA, Takumi SAKAGUCHI