Patents by Inventor Yoshihisa Tateishi

Yoshihisa Tateishi 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).

  • Synthetic resin pipe
    Patent number: 6024130
    Abstract: A pipe having a substantially square cross section portion and a substantially circular cross section portion are disposed alternately in the axial direction of the pipe. The thickness of the circular portion is set uneven in the circumferential direction. In particular, the thickness of the portions of the circular portion that correspond to the corner portions of the square portion is set larger than the thickness of the portions that correspond to the central portions of the respective sides of the square portions. Accordingly, a pipe having corner portions with increased pressure deformation resistance is obtained. Also, the pipe is capable of being manufactured in a high efficiency manner.
    Type: Grant
    Filed: May 22, 1998
    Date of Patent: February 15, 2000
    Assignee: Totaku Industries, Inc.
    Inventors: Yoshiaki Tatsuta, Yoshihisa Tateishi