Patents by Inventor Hiroshi Ona

Hiroshi Ona 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).

  • Pipe member, method and apparatus for manufacturing the pipe member
    Patent number: 6131431
    Abstract: There is disclosed a pipe member rolled up as a coil and roll-formed, the pipe member made of material having a spring-back characteristics and having a specific residual stress distribution existing along a direction perpendicular to the rolling-up direction of said pipe member, the specific residual stress distribution being formed by being wounded around a longitudinal direction thereof by roll-forming, and when the member is unfurled out, two longitudinal edge portions of the member being overlapped to each other thus forming a pipe shape.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: October 17, 2000
    Assignee: Takushoku University
    Inventor: Hiroshi Ona