Patents by Inventor Ryouichi Nakano

Ryouichi Nakano 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).

  • Pipe comprising ethylene base polymer
    Publication number: 20040166267
    Abstract: The pipe of the present invention comprises an ethylene base polymer comprising ethylene and an &agr;-olefin having 3 to 20 carbon atoms, wherein (A) a maximum value of the residual stress is 0.13 MPa or less; (B) the crystallinity is 0.630 to 0.850; (C) a gradient of the crystallinity against a thickness of the pipe is 0.465 or less; and (D) the pipe has a thickness of 5 to 50 mm. It is excellent in a durability, a rigidity and an impact resistance and suited to uses for large diameter pipes receiving a high internal pressure.
    Type: Application
    Filed: February 10, 2004
    Publication date: August 26, 2004
    Applicants: Idemitsu Petrochemical Co., Ltd., Kurimoto, Ltd.
    Inventors: Katsutoshi Ohta, Shigeru Murakami, Ryouichi Nakano
  • Pipe comprising ethylene base polymer
    Patent number: 6720048
    Abstract: The pipe of the present invention comprises an ethylene base polymer comprising ethylene and an &agr;-olefin having 3 to 20 carbon atoms, wherein (A) a maximum value of the residual stress is 0.13 MPa or less; (B) the crystallinity is 0.630 to 0.850; (C) a gradient of the crystallinity against a thickness of the pipe is 0.465 or less; and (D) the pipe has a thickness of 5 to 50 mm. It is excellent in a durability, a rigidity and an impact resistance and suited to uses for large diameter pipes receiving a high internal pressure.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: April 13, 2004
    Assignees: Idemitsu Petrochemical Co., Ltd., Kurimoto, Ltd.
    Inventors: Katsutoshi Ohta, Shigeru Murakami, Ryouichi Nakano
  • Pipe made of ethylene polymer
    Publication number: 20020188086
    Abstract: The pipe of the present invention comprises an ethylene base polymer comprising ethylene and an &agr;-olefin having 3 to 20 carbon atoms, wherein (A) a maximum value of the residual stress is 0.13 MPa or less; (B) the crystallinity is 0.630 to 0.850; (C) a gradient of the crystallinity against a thickness of the pipe is 0.465 or less; and (D) the pipe has a thickness of 5 to 50 mm. It is excellent in a durability, a rigidity and an impact resistance and suited to uses for large diameter pipes receiving a high internal pressure.
    Type: Application
    Filed: February 22, 2002
    Publication date: December 12, 2002
    Inventors: Katsutoshi Ohta, Shigeru Murakami, Ryouichi Nakano