Patents by Inventor Hajime Ninomiya

Hajime Ninomiya 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).

  • Corrosion-preventive sleeve for drilled hole in metal pipe and tool for mounting the same
    Patent number: 5244236
    Abstract: The invention relates to a corrosion-preventive sleeve for preventing corrosion of a drilled hole in a metal pipe, and also to a mounting tool for mounting this corrosion-preventive sleeve in such drilled hole. The corrosion-preventive sleeve comprises an elastic sleeve and a corrosion-resistant metal sleeve to be inserted into the elastic sleeve. The elastic sleeve with the corrosion-resistant metal sleeve inserted therein in its diametrically contracted state is inserted into the drilled hole. Subsequently, the tapered member of the mounting tool is passed through the metal sleeve, whereby the latter is diametrically expanded. Then, with this, the elastic sleeve is also diametrically expanded and is intimately contacted with the inner surface of the drilled hole.
    Type: Grant
    Filed: April 17, 1991
    Date of Patent: September 14, 1993
    Assignee: Kubota Corporation
    Inventor: Hajime Ninomiya