Patents by Inventor Katsumi Kamimura

Katsumi Kamimura 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).

  • Expansion beam for shoring up sand guards
    Patent number: 4591298
    Abstract: A plug of an expansion beam for shoring up sand guards is equipped with a second non-return valve. If it should happen that the head of the plug is broken off owing to, for example, a falling rock, the second non-return valve works as a safety device to prevent the expansion and contraction of the expansion beam. Thus, the shoring up function is able to be maintained.
    Type: Grant
    Filed: November 2, 1984
    Date of Patent: May 27, 1986
    Assignee: Japan Speed Shore Co., Ltd.
    Inventors: Kenichi Fukumori, Katsumi Kamimura