Patents by Inventor Sakae MARUYAMA

Sakae MARUYAMA 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).

  • Rotary press-in steel pipe pile
    Patent number: 10174475
    Abstract: This rotary press-in steel pipe pile includes: a steel pipe; a first blade which is formed in a substantially helical shape on the steel pipe so as to be positioned close to the distal end the steel pipe and in which a first sectorial gap having a central angle is formed in a circumferential direction thereof; and a second blade which is formed in a substantially helical shape on the steel pipe so as to be positioned close to the rear end of the steel pipe with respect to the first blade and in which a second sectorial gap having a central angle is formed in a circumferential direction thereof. The first sectorial gap of the first blade and the second sectorial gap of the second blade are disposed at positions that do not overlap in a circumferential direction, and the central angle of the second sectorial gap is set to be smaller than the central angle of the first sectorial gap.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: January 8, 2019
    Assignee: NIPPON STEEL & SUMIKIN METAL PRODUCTS CO., LTD.
    Inventors: Kimihiro Nakazawa, Masatoshi Wada, Masamichi Sawaishi, Sakae Maruyama, Tomoyuki Shohji, Tomonori Yagishita, Takeshi Sawada
  • ROTARY PRESS-IN STEEL PIPE PILE
    Publication number: 20170241099
    Abstract: This rotary press-in steel pipe pile includes: a steel pipe; a first blade which is formed in a substantially helical shape on the steel pipe so as to be positioned close to the distal end the steel pipe and in which a first sectorial gap having a central angle is formed in a circumferential direction thereof; and a second blade which is formed in a substantially helical shape on the steel pipe so as to be positioned close to the rear end of the steel pipe with respect to the first blade and in which a second sectorial gap having a central angle is formed in a circumferential direction thereof. The first sectorial gap of the first blade and the second sectorial gap of the second blade are disposed at positions that do not overlap in a circumferential direction, and the central angle of the second sectorial gap is set to be smaller than the central angle of the first sectorial gap.
    Type: Application
    Filed: October 21, 2015
    Publication date: August 24, 2017
    Applicant: NIPPON STEEL & SUMIKIN ENGINEERING CO., LTD.
    Inventors: Kimihiro NAKAZAWA, Masatoshi WADA, Masamichi SAWAISHI, Sakae MARUYAMA, Tomoyuki SHOHJI, Tomonori YAGISHITA, Takeshi SAWADA