Patents by Inventor Kouji Takegawa

Kouji Takegawa 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).

  • Multilayer porous film, separator for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, slurry, and coating liquid
    Patent number: 10305080
    Abstract: The viscosity stability in forming a slurry of one or metal components selected from water-insoluble metal oxides and metal salts is improved, and using the resultant slurry, a coating layer is formed on a polyolefinic resin porous film to give a multilayer porous film having excellent surface smoothness. The multilayer porous film has, as layered on at least one surface of a polyolefinic resin porous film, a coating layer that contains one or more metal components selected from water-insoluble metal oxides and metal salts, and a resin binder, wherein the content of water-soluble calcium contained in the metal components is 3 ppm by mass or less.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: May 28, 2019
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Hiroto Yamada, Kouji Takegawa, Tomoyuki Nemoto
  • MULTILAYER POROUS FILM, SEPARATOR FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, SLURRY, AND COATING LIQUID
    Publication number: 20160043371
    Abstract: The viscosity stability in forming a slurry of one or metal components selected from water-insoluble metal oxides and metal salts is improved, and using the resultant slurry, a coating layer is formed on a polyolefinic resin porous film to give a multilayer porous film having excellent surface smoothness. The multilayer porous film has, as layered on at least one surface of a polyolefinic resin porous film, a coating layer that contains one or more metal components selected from water-insoluble metal oxides and metal salts, and a resin binder, wherein the content of water-soluble calcium contained in the metal components is 3 ppm by mass or less.
    Type: Application
    Filed: August 4, 2015
    Publication date: February 11, 2016
    Applicant: MITSUBISHI PLASTICS, INC.
    Inventors: Hiroto YAMADA, Kouji TAKEGAWA, Tomoyuki NEMOTO
  • POLYOLEFIN RESIN POROUS FILM
    Publication number: 20150125734
    Abstract: The purpose of the present invention is to provide a polyolefin resin porous film, which is resistant to wrinkling in a transporting step in a high-temperature environment due to a high shrinkage stress, has superior coating suitability, maintains pore interconnectivity, and thus has superior air permeability. The polyolefin resin porous film of the present invention has a 1% modulus in the flow direction at 90° C. of 4.5 MPa or more and an air permeability of 800 sec/100 ml or less.
    Type: Application
    Filed: June 5, 2013
    Publication date: May 7, 2015
    Applicant: MITSUBISHI PLASTICS, INC.
    Inventors: Takeyoshi Yamada, Yasushi Usami, Kouji Takegawa