Patents by Inventor Mutsuko Endou

Mutsuko Endou 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 for measuring the number of fine particles in ultrapure water and method for manufacturing a filtration device for measuring the number of fine particles in ultrapure water
    Patent number: 7805983
    Abstract: A method for measuring the number of fine particles in ultrapure water includes subjecting the ultrapure water to internal pressure filtration through a hollow fiber membrane having a skin layer capable of trapping the fine particles in the ultrapure water at least on an inner surface thereof, exposing the inner surface of the hollow fiber membrane, and measuring the number of fine particles on the exposed inner surface.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: October 5, 2010
    Assignees: Nomura Micro Science Co., Ltd., Asahi Kasei Chemicals Corp.
    Inventors: Mutsuko Endou, Tooru Kusano, Kazunari Akahira, Takashi Ito
  • Method For Measuring Number of Fine Particles in Ultrapure Water, Filtration Device For Measuring Number of Fine Particles, Method For Manufacturing Thereof, and Hollow Fiber Membrane Unit For Use in the Device
    Publication number: 20080168828
    Abstract: A method for measuring the number of fine particles in ultrapure water includes subjecting the ultrapure water to internal pressure filtration through a hollow fiber membrane having a skin layer capable of trapping the fine particles in the ultrapure water at least on an inner surface thereof, exposing the inner surface of the hollow fiber membrane, and measuring the number of fine particles on the exposed inner surface.
    Type: Application
    Filed: January 18, 2006
    Publication date: July 17, 2008
    Inventors: Mutsuko Endou, Tooru Kusano, Kazunari Akahira, Takashi Ito
  • Method and device for measuring fine particles in ultrapure water
    Patent number: 7043394
    Abstract: A novel measuring method which allows measurement of fine particles which are extremely fine and contained in a very small amount in ultrapure water is provided. The number frequency with respect to the fine particles having a particle diameter of 0.1 ?m or more is measured based on the finding that the fine particles contained in the ultrapure water at the use point of an ultrapure water production system exhibits a logarithmic normal distribution to determine the logarithmic normal distribution of the fine particles contained in the ultrapure water, and the number of the fine particles having a particle diameter of less than those of the measured particles contained in the ultrapure water is obtained from the distribution.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: May 9, 2006
    Assignee: Nomura Micro Science Co., Ltd.
    Inventors: Yasuo Kousaka, Mutsuko Endou, Seiichi Inagaki, Takazou Hirose, Motonori Yanagi
  • Method and device for measuring fine particles in ultrapure water
    Publication number: 20050228610
    Abstract: A novel measuring method which allows measurement of fine particles which are extremely fine and contained in a very small amount in ultrapure water is provided. The number frequency with respect to the fine particles having a particle diameter of 0.1 ?m or more is measured based on the finding that the fine particles contained in the ultrapure water at the use point of an ultrapure water production system exhibits a logarithmic normal distribution to determine the logarithmic normal distribution of the fine particles contained in the ultrapure water, and the number of the fine particles having a particle diameter of less than those of the measured particles contained in the ultrapure water is obtained from the distribution.
    Type: Application
    Filed: April 25, 2003
    Publication date: October 13, 2005
    Inventors: Yasuo Kousaka, Mutsuko Endou, Seiichi Inagaki, Takazou Hirose, Motonori Yanagi