Patents by Inventor Shigeyoshi Shibahara

Shigeyoshi Shibahara 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).

  • Underground pipe for a thrust boring method and a connecting construction of the underground pipe for the same
    Patent number: 5104263
    Abstract: An underground pipe for a thrust boring method whereby the underground pipe is thrust through the ground, one being connected to another, while boring a horizontal tunnel through the ground. This invention also relates to a connecting construction of the underground pipe for the thrust boring method. The underground pipes are connected with each other directly or by means of a collar. A plurality of projecting lines are formed either on the collar or the pipe body. The lines extend continuously or discontinuously in the axial direction of the pipe with suitable spacing provided therebetween in the circumferential direction of the pipe.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: April 14, 1992
    Assignees: Sekisui Kagaku Kogyo Kabushiki Kaisha, C.I. Kasei Co, Ltd.
    Inventors: Shigeyoshi Shibahara, Takahiro Morimoto