Patents by Inventor Hiroharu Nishida

Hiroharu Nishida 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).

  • Propulsion method of pipe to be buried without soil discharge and an excavator
    Patent number: 5211510
    Abstract: A propulsion method of a pipe to be buried without soil discharge comprising the steps of drilling the ground with the tip of an excavator propelling in the ground, taking the drilled soil into the excavator, discharging the taken soil to the ground side by compacting the soil on the outer circumference of the excavator, and burying the pipe progressively in the hole formed behind the excavator; being characterized in using an excavator equipped with a tip part having a diameter larger than the outside diameter of the pipe to be buried and a rear part having nearly the same diameter as the outside diameter of the pipe to be buried.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: May 18, 1993
    Assignee: Kidoh Construction Co., Ltd.
    Inventors: Koichi Kimura, Hiroharu Nishida