Patents by Inventor Atuo Hirai

Atuo Hirai 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).

  • Method and apparatus for dewatering screenings
    Patent number: 4373433
    Abstract: A method and an apparatus for dewatering screenings collected at a sewage treatment plant or the like continuously and effectively by preliminary and secondary dewatering processes. Any alien substance mixed in the screenings such as stone, chips of wood, etc. which cannot be dewatered can be detected automatically and extracted immediately, without suspending the operation of the apparatus.
    Type: Grant
    Filed: January 26, 1981
    Date of Patent: February 15, 1983
    Assignee: Hitachi Kiden Kogyo, Ltd.
    Inventors: Shigeki Kamei, Masamori Fushio, Atuo Hirai