Patents by Inventor Takao Migaki

Takao Migaki 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).

  • Composite hollow fiber type separation membranes processes for the preparation thereof and their use
    Patent number: 4938778
    Abstract: A composite hollow fiber type separation membrane which has three layers comprising a selective separation layer, an ultra-microporous layer and a porous layer, said selective separation layer, said ultra-microporous layer, said porous layer being arranged in said order commencing from the inner surface of said hollow fiber membrane;wherein said selective separation layer is formed on said ultra-microporous layer without penetrating into said ultra-microporous layer and has a non-porous, dense structure, the average thickness of said layer being 0.01-2.mu., and the coefficient of variation in thickness thereof being less than or equal to 25%;wherein said ultra-microporous layer has a surface in which the presence of pores cannot be confirmed by 24,000x scanning electron microscopy, but which has fluid permeability at least 10 times that of said selective separation layer, the thickness of said layer being less than or equal to 0.08.mu.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: July 3, 1990
    Assignee: Kuraray Co., Ltd.
    Inventors: Shuzo Ohyabu, Syuji Kawai, Takehiko Okamoto, Takao Migaki
  • Fluid treating apparatus and method of using it
    Patent number: 4911846
    Abstract: Disclosed is a fluid treating apparatus of hollow fiber type. The apparatus can prevent channeling or stagnation of the fluid which flows inside it by specifying the densities of the hollow fibers and the warps forming a hollow fiber sheet and the laminating conditions for laminating the hollow fiber sheets to form a laminate which is to be housed in a housing.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: March 27, 1990
    Assignee: Kuraray Co., Ltd.
    Inventors: Hiroyuki Akasu, Rishichi Mimura, Takao Migaki, Takashi Yamauchi, Michio Kusachi
  • Composite hollow fiber-type separation membranes, processes for the preparation thereof and their use
    Patent number: 4664669
    Abstract: A composite hollow fiber type separation membrane which has three layers comprising a selective separation layer, an ultra-microporous layer and a porous layer, said selective separation layer, said ultra-microporous layer, said porous layer being arranged in said order commencing from the inner surface of said hollow fiber membrane;wherein said selective separation layer is formed on said ultra-microporous layer without penetrating into said ultra-microporous layer and has a non-porous, dense structure, the average thickness of said layer being 0.01-2.mu., and the coefficient of variation in thickness thereof being less than or equal to 25%;wherein said ultra-microporous layer has a surface in which the presence of pores cannot be confirmed by 24,000 .times. scanning electron microscopy, but which has a fluid permeability at least 10 times that of said selective separation layer, the thickness of said layer being less than or equal to 0.08.mu.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: May 12, 1987
    Assignee: Kuraray Co. Ltd.
    Inventors: Shuzo Ohyabu, Syuji Kawai, Takehiko Okamoto, Takao Migaki