Patents by Inventor Tetsuya Yoshikiyo

Tetsuya Yoshikiyo 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).

  • PIPELINE MEMBER FOR ULTRAPURE WATER AND POLYETHYLENE-BASED RESIN COMPOSITION FOR PIPELINE MEMBER FOR ULTRAPURE WATER
    Publication number: 20230151223
    Abstract: A pipe (10) includes a polyethylene-based resin layer (21) containing a polyethylene-based resin composition as a major component. The polyethylene-based resin layer (21) forms a pipeline member inner surface (10a). The polyethylene-based resin composition has a calcium concentration of 10 ppm or more and 60 ppm or less.
    Type: Application
    Filed: March 9, 2021
    Publication date: May 18, 2023
    Applicants: SEKISUI CHEMICAL CO., LTD., JAPAN POLYETHYLENE CORPORATION
    Inventors: Tomoki YAMADA, Hirotsugu YOSHIDA, Hirotaka TAKANO, Tetsuya YOSHIKIYO, Tomoki HIRAMOTO
  • POLYETHYLENE RESIN, PROCESS FOR PRODUCING THE SAME, AND PIPE AND JOINT COMPRISING THE RESIN
    Publication number: 20090082523
    Abstract: The invention relates to a polyethylene resin having excellent slow crack growth property, in particular a resin having excellent durability in a pipe application, which has a specific (a) high-load melt flowrate (HLMFR; HLa), a specific (b) density (Da), and a specific (c) ?-olefin content (Ca) and in which (d) a breaking time (T) measured by notched Lander ESCR, the HLa, and the Ca satisfy log T??2.9×log HLa+5.1×log Ca+6.8. It further relates to a process for producing the resin and to a pipe and a joint each comprising the resin.
    Type: Application
    Filed: May 23, 2006
    Publication date: March 26, 2009
    Applicant: JAPAN POLYETHYLENE CORPORATION
    Inventors: Shigeki Saito, Yoshito Sasaki, Tetsuya Yoshikiyo, Hirofumi Nishibu