Patents by Inventor Toshio Nagahisa

Toshio Nagahisa 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).

  • Apparatus for improving characteristics of sand
    Patent number: 4832853
    Abstract: In apparatus for removing water and impurity components from sand, there are provided a rotary member having an opening at one end for charging and discharging sand and a filter for passing water. The rotary member is supported by a support and driven by a variable speed motor. Piston-cylinders or the like are provided for tilting the support. In a modified embodiment, two of the rotary bodies are juxtaposed with their openings faced each other. A peripheral wall of the rotary member is provided with a member of perforations for discharging water separated from sand.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: May 23, 1989
    Assignee: Kitagawa Iron Works Co., Ltd.
    Inventors: Hisashi Shiraki, Toshio Nagahisa, Kiyonori Takeda, Takeshi Harada
  • Apparatus for improving characteristics of sand
    Patent number: 4717478
    Abstract: In apparatus for removing water and impurity components from sand, there are provided a rotary member having an opening at one end for charging and discharging sand and a filter for passing water. The rotary member is supported by a support and driven by a variable speed motor. Piston-cylinders or the like are provided for tilting the support. In a modified embodiment, two of the rotary bodies are juxtaposed with their openings faced each other. A peripheral wall of the rotary member is provided with a member of perforations for discharging water separated from sand.
    Type: Grant
    Filed: June 12, 1986
    Date of Patent: January 5, 1988
    Assignee: Kitagawa Iron Works Co., Ltd.
    Inventors: Hisashi Shiraki, Toshio Nagahisa, Kiyonori Takeda, Takeshi Harada