Patents by Inventor Hiroto TSUJI

Hiroto TSUJI 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).

  • Leaf spring device and method for manufacturing leaf spring device
    Patent number: 10549594
    Abstract: A leaf spring device includes a main leaf made of a steel plate including an elastic section configured to generate elastic force when bent; and an eye section formed in an end portion of the elastic section, the elastic section and the eye section being tempered. There is also provided a method for manufacturing the leaf spring device. The eye section is formed by rolling the end of the elastic section into a circular form. The eye section is tempered at a higher temperature than the elastic section.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: February 4, 2020
    Assignee: NHK SPRING CO., LTD.
    Inventors: Hidenori Chihara, Hiroto Tsuji, Shinichiro Kuwatsuka
  • LEAF SPRING DEVICE AND METHOD FOR MANUFACTURING LEAF SPRING DEVICE
    Publication number: 20170313149
    Abstract: A leaf spring device includes a main leaf made of a steel plate including an elastic section configured to generate elastic force when bent; and an eye section formed in an end portion of the elastic section, the elastic section and the eye section being tempered. There is also provided a method for manufacturing the leaf spring device. The eye section is formed by rolling the end of the elastic section into a circular form. The eye section is tempered at a higher temperature than the elastic section.
    Type: Application
    Filed: November 10, 2015
    Publication date: November 2, 2017
    Inventors: Hidenori CHIHARA, Hiroto TSUJI, Shinichiro KUWATSUKA