Patents by Inventor Yutaka Niida

Yutaka Niida 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 disinfecting drainage
    Patent number: 6562244
    Abstract: A method and an apparatus for disinfecting drainage are provided. A bromine-based or iodine-based disinfectant is added to water to obtain disinfecting water, and the disinfecting water is added to predetermined drainage. The apparatus has a device for producing disinfecting water from a disinfectant and drainage, a sand basin, and a channel for introducing the disinfecting water into the sand basin, and the drainage is disinfected while the drainage is dwelling in the sand basin.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: May 13, 2003
    Assignee: Ebara Corporation
    Inventors: Yoshiharu Yasuhara, Kazuhiro Hasegawa, Kazunari Tanaka, Yuichi Fuchu, Yutaka Niida, Hideyuki Yoshida, Hiromasa Kaihatsu, Hiroshi Toriumi, Hiroshi Takasu, Tadashi Nagawa, Sumio Komine
  • Solid-liquid separator
    Patent number: 6482320
    Abstract: A solid-liquid separator including a separation tank, a treated water outlet (16) at the top of the tank, a sludge outlet (17) at the bottom of the tank, a draft tube (3) near the center in an upper inner zone of the tank and connected to a raw water inlet pipe (2), horizontally rotatable multistage stirring blades A (5) in the draft tube, horizontally rotatable multistage stirring blades B (6) immediately below the draft tube, a horizontal baffle (8) below the stirring blades B, a floating filter medium layer (10) around the outside of the draft tube above the stirring blades B, and a screen (12) fixed below the water level above the filter medium layer, and optionally, a filter medium-receiving screen (13) around the lower outside of the tube in combination with stirring rods (14) above the screen or aeration nozzles.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: November 19, 2002
    Assignee: Ebara Corporation
    Inventors: Sakae Kosanda, Yuichi Fuchu, Yutaka Niida, Koichi Masuda, Seiichi Tsuda
  • Solid-liquid separator
    Publication number: 20010019027
    Abstract: An object of the present invention is to provide a compact solid-liquid separator having a high water surface loading which can limit pollutant's outflow even when flocs are insufficiently pelletized.
    Type: Application
    Filed: February 27, 2001
    Publication date: September 6, 2001
    Inventors: Sakae Kosanda, Yuichi Fuchu, Yutaka Niida, Koichi Masuda, Seiichi Tsuda
  • Wristwatch structure
    Patent number: 4038814
    Abstract: An electronic watch in a watch case comprising a crystal oscillator, an integrated circuit chip having at least an oscillator circuit and display device, a battery, at least two magnetically operated switches for controlling the watch functions, and one or more magnets movably coupled to the watch case for operating the switches. The magnets and the switches are arranged such that the switches are operated by manually moving the magnet to magnetize any of the switches, thereby increasing the water-proof competency with easier handling.
    Type: Grant
    Filed: February 18, 1976
    Date of Patent: August 2, 1977
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Yutaka Niida