Patents by Inventor Michihito Nakatani

Michihito Nakatani 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).

  • Bismuth compound, curable composition and cured product
    Patent number: 11186600
    Abstract: A bismuth compound which is little toxic, insoluble in a monomer, usable for optical purpose and used as a substitute for a lead compound, in which a phosphoric acid ester having a (meth)acrylic group(s) is bonded to bismuth, and a method of producing the bismuth compound by reacting bismuth (meth)acrylate or bismuth subsalicylate with a phosphoric acid ester having a (meth)acrylic group(s) and carrying out dehydration.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: November 30, 2021
    Assignee: TOKUYAMA CORPORATION
    Inventors: Takayoshi Kawasaki, Junji Momoda, Tomohiro Kawamura, Mayumi Kishi, Michihito Nakatani
  • BISMUTH COMPOUND, CURABLE COMPOSITION AND CURED PRODUCT
    Publication number: 20210070790
    Abstract: A bismuth compound which is little toxic, insoluble in a monomer, usable for optical purpose and used as a substitute for a lead compound, in which a phosphoric acid ester having a (meth)acrylic group(s) is bonded to bismuth, and a method of producing the bismuth compound by reacting bismuth (meth)acrylate or bismuth subsalicylate with a phosphoric acid ester having a (meth)acrylic group(s) and carrying out dehydration.
    Type: Application
    Filed: March 14, 2019
    Publication date: March 11, 2021
    Applicant: TOKUYAMA CORPORATION
    Inventors: Takayoshi KAWASAKI, Junji MOMODA, Tomohiro KAWAMURA, Mayumi KISHI, Michihito NAKATANI
  • Stainless steel member and production method thereof
    Patent number: 10906021
    Abstract: The purpose of the present invention is to provide a stainless steel member and a production method thereof, said stainless steel member having a passivation layer formed on a surface of a base material formed from stainless steel, wherein the film thickness of the passivation layer is 2-20 nm, and the concentration of chromium atoms in the outermost surface of the passivation layer is 0.1-2.3 by atomic percentage. Also provided are a device or container, the liquid-contact part of which in contact with a semiconductor treatment liquid is formed from the stainless steel member, a semiconductor treatment liquid production method for producing the semiconductor treatment liquid by using the device, and a semiconductor treatment liquid storage method for storing the semiconductor treatment liquid in the container.
    Type: Grant
    Filed: February 25, 2019
    Date of Patent: February 2, 2021
    Assignee: TOKUYAMA CORPORATION
    Inventors: Akira Sera, Michihito Nakatani, Yumiko Nakamura
  • STAINLESS STEEL MEMBER AND PRODUCTION METHOD THEREOF
    Publication number: 20210001303
    Abstract: The purpose of the present invention is to provide a stainless steel member and a production method thereof, said stainless steel member having a passivation layer formed on a surface of a base material formed from stainless steel, wherein the film thickness of the passivation layer is 2-20 nm, and the concentration of chromium atoms in the outermost surface of the passivation layer is 0.1-2.3 by atomic percentage. Also provided are a device or container, the liquid-contact part of which in contact with a semiconductor treatment liquid is formed from the stainless steel member, a semiconductor treatment liquid production method for producing the semiconductor treatment liquid by using the device, and a semiconductor treatment liquid storage method for storing the semiconductor treatment liquid in the container.
    Type: Application
    Filed: February 25, 2019
    Publication date: January 7, 2021
    Applicant: TOKUYAMA CORPORATION
    Inventors: Akira Sera, Michihito Nakatani, Yumiko Nakamura