Patents by Inventor Hiroyuki Kawagishi

Hiroyuki Kawagishi 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).

  • Green compact of incineration ashes of sewerage sludge and its burned product
    Patent number: 4997711
    Abstract: According to the present invention, incineration ashes of sewerage sludge are compacted with pressure, but without additives, to have the bulk specific gravity of 0.9-2.5. Since the green compact has sufficient strength and reduced volume in comparison with the incineration ashes before compacting, it enables mass dumping without causing secondary pollution. Moreover, if the green compact is fired to have the bulk specific gravity of 1.4-3.5, both the volume and weight are reduced much more, realizing easy handling of the resulted burned product.
    Type: Grant
    Filed: September 29, 1989
    Date of Patent: March 5, 1991
    Assignee: Chugai Ro Co., Ltd.
    Inventors: Shiro Takahashi, Kazuki Taniguchi, Hiroyuki Kawagishi, Ryoji Kawamura