Patents by Inventor Yoshifumi Usui

Yoshifumi Usui 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).

  • Filtration concentration apparatus and method
    Patent number: 5498349
    Abstract: A filtration concentration apparatus and method by which a high operation efficiency of a filter is assured are disclosed. The filtration concentration apparatus comprises an original liquid intake path interconnecting a primary side of a pump and an original liquid storage tank, an original liquid supply path interconnecting a secondary side of the pump and an original liquid chamber of a filter, an original liquid return path interconnecting the secondary side of the pump and the storage tank, an original liquid recovery path interconnecting the original liquid chamber and the primary side of the pump, a liquid discharge path interconnecting a bottom portion of the original liquid chamber and a waste liquid tank, and a control unit for controlling the recovery path to open when the intake path and the supply path are open and controlling the intake path and the supply path to close when the recovery path and the return path are open.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: March 12, 1996
    Assignee: Kabushiki Kaisha Sanshin Seisakusho
    Inventors: Yoichi Kurahashi, Yoshifumi Usui, Kazuhiko Yagishita, Aisaburo Yagishita