Patents by Inventor Hisao Iwata

Hisao Iwata 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).

  • Grab bucket for dredging sludge
    Patent number: 3949498
    Abstract: A grab bucket particularly suitable for dredging the bottom of the sea, rivers, lakes, etc. is provided with bottom plates at the lower portion of a framework from the bottom of which pivotally hang a pair of bucket shells, whereby the bottom plates cooperate with the bucket shells to shield their upper openings when they are swung upwards about their pivotal portions to put their respective confronting edges tightly together in a conventional manner.
    Type: Grant
    Filed: October 30, 1974
    Date of Patent: April 13, 1976
    Assignee: Mitsubishi Seiko Kabushiki Kaisha
    Inventors: Hisao Iwata, Gentaro Hasewaga, Kameichi Shimizu