Patents by Inventor Yasuhiro Saitoh

Yasuhiro Saitoh 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).

  • Particulate matter washing method
    Patent number: 6382221
    Abstract: In a method of washing contaminated particulate matter, a screw conveyor is disposed in a cleaning tank for rotation around a substantially vertical axis so that the lower part of the screw conveyor is positioned under the surface of the cleaning water and the upper part of the screw conveyor is positioned above the surface of the cleaning water. Under the surface of the water, the grains of the particulate matter are contacted with each other with sludge being interposed therebetween to remove at least a part of contamination substances from the surface of the grains of the particulate matter and to wash off the substances into the water.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: May 7, 2002
    Assignee: Nihon Genryo Co., Ltd.
    Inventor: Yasuhiro Saitoh
  • Particulate matter washing method
    Publication number: 20010018921
    Abstract: In a method of washing contaminated particulate matter, a screw conveyor is disposed in a cleaning tank for rotation around a substantially vertical axis so that the lower part of the screw conveyor is positioned under the surface of the cleaning water and the upper part of the screw conveyor is positioned above the surface of the cleaning water. Under the surface of the water, the grains of the particulate matter are contacted with each other with sludge being interposed therebetween to remove at least a part of contamination substances from the surface of the grains of the particulate matter and to wash off the substances into the water.
    Type: Application
    Filed: April 10, 2001
    Publication date: September 6, 2001
    Applicant: Nihon Genryo Co., Ltd.
    Inventor: Yasuhiro Saitoh
  • Particulate matter washing apparatus and method
    Patent number: 6273106
    Abstract: In a method of washing contaminated particulate matter, a screw conveyor is disposed in a cleaning tank for rotation around a substantially vertical axis so that the lower part of the screw conveyor is positioned under the surface of the cleaning water and the upper part of the screw conveyor is positioned above the surface of the cleaning water. Under the surface of the water, the grains of the particulate matter are contacted with each other with sludge being interposed therebetween to remove at least a part of contamination substances from the surface of the grains of the particulate matter and to wash off the substances into the water.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: August 14, 2001
    Assignee: Nihon Genryo Co., Ltd.
    Inventor: Yasuhiro Saitoh