Patents by Inventor Yoshifumi Takahei

Yoshifumi Takahei 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).

  • Method of sealing construction joint in top-down construction method
    Patent number: 5123784
    Abstract: A method of sealing a concrete joint formed between a pair of concrete castings by creating an injection hole wherein a removable frame member can be attached to the bottom surface of the first concrete casting so as to form obtuse angles with the concrete casting surface. The other concrete casting is then cast around the frame member. The frame member is then removed to form the injection hole of the desired configuration, and sealing material can then be inserted into the injection hole for feeding into, and sealing of, the joint.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: June 23, 1992
    Assignee: Takenaka Corporation
    Inventor: Yoshifumi Takahei