Patents by Inventor Emi TSUTSUMI

Emi TSUTSUMI 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).

  • Publication number: 20240124774
    Abstract: A Cd-free blue fluorescent quantum dot with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHM is 25 nm or less. The quantum dot is preferably a nanocrystal containing zinc and selenium or zinc and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Application
    Filed: November 3, 2023
    Publication date: April 18, 2024
    Applicant: NS MATERIALS INC.
    Inventors: Yuko OGURA, Yuka TAKAMIZUMA, Kazunori IIDA, Emi TSUTSUMI, Masanori TANAKA, Soichiro NIKATA
  • Patent number: 11905443
    Abstract: To provide a quantum dot-containing resin sheet or film, a method for producing the same, and a wavelength conversion member that can, in particular, solve the problem of aggregation of the quantum dots and the problem with the use of a scattering agent, suppress a decrease in light conversion efficiency, and improve the light conversion efficiency of a resin molded product containing quantum dots. The quantum dot-containing resin sheet or film of the present invention includes a stack of a plurality of resin layers, at least one of the resin layers containing quantum dots, and the plurality of resin layers is integrally molded through co-extrusion.
    Type: Grant
    Filed: March 1, 2023
    Date of Patent: February 20, 2024
    Assignee: NS MATERIALS INC.
    Inventors: Kazunori Iida, Emi Tsutsumi, Mika Niwaki, Jun Kaneno, Soichiro Nikata, Hidetoshi Tanaka
  • Patent number: 11845890
    Abstract: Provided is a Cd-free blue fluorescent quantum dot with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHM is 25 nm or less. The quantum dot is preferably a nanocrystal containing zinc and selenium or zinc and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Grant
    Filed: August 18, 2021
    Date of Patent: December 19, 2023
    Assignee: NS MATERIALS INC.
    Inventors: Yuko Ogura, Yuka Takamizuma, Kazunori Iida, Emi Tsutsumi, Masanori Tanaka, Soichiro Nikata
  • Publication number: 20230203366
    Abstract: To provide a quantum dot-containing resin sheet or film, a method for producing the same, and a wavelength conversion member that can, in particular, solve the problem of aggregation of the quantum dots and the problem with the use of a scattering agent, suppress a decrease in light conversion efficiency, and improve the light conversion efficiency of a resin molded product containing quantum dots. The quantum dot-containing resin sheet or film of the present invention includes a stack of a plurality of resin layers, at least one of the resin layers containing quantum dots, and the plurality of resin layers is integrally molded through co-extrusion.
    Type: Application
    Filed: March 1, 2023
    Publication date: June 29, 2023
    Applicant: NS MATERIALS INC.
    Inventors: Kazunori IIDA, Emi TSUTSUMI, Mika NIWAKI, Jun KANENO, Soichiro NIKATA, Hidetoshi TANAKA
  • Patent number: 11629288
    Abstract: To provide a quantum dot-containing resin sheet or film, a method for producing the same, and a wavelength conversion member that can, in particular, solve the problem of aggregation of the quantum dots and the problem with the use of a scattering agent, suppress a decrease in light conversion efficiency, and improve the light conversion efficiency of a resin molded product containing quantum dots. The quantum dot-containing resin sheet or film of the present invention includes a stack of a plurality of resin layers, at least one of the resin layers containing quantum dots, and the plurality of resin layers is integrally molded through co-extrusion.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: April 18, 2023
    Assignee: NS MATERIALS INC.
    Inventors: Kazunori Iida, Emi Tsutsumi, Mika Niwaki, Jun Kaneno, Soichiro Nikata, Hidetoshi Tanaka
  • Patent number: 11257981
    Abstract: The present invention seeks to provide cadmium-free quantum dots with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHM is 30 nm or less. The quantum dot is preferably a nanocrystal containing zinc and tellurium or zinc and tellurium and sulfur or zinc and tellurium and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: February 22, 2022
    Assignee: NS MATERIALS INC.
    Inventors: Kazunori Iida, Emi Tsutsumi, Yuko Ogura, Masanori Tanaka, Soichiro Nikata, Yuka Takamizuma
  • Publication number: 20210388263
    Abstract: Provided is a Cd-free blue fluorescent quantum dot with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHM is 25 nm or less. The quantum dot is preferably a nanocrystal containing zinc and selenium or zinc and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Application
    Filed: August 18, 2021
    Publication date: December 16, 2021
    Applicant: NS MATERIALS INC.
    Inventors: Yuko OGURA, Yuka TAKAMIZUMA, Kazunori IIDA, Emi TSUTSUMI, Masanori TANAKA, Soichiro NIKATA
  • Patent number: 11124703
    Abstract: Provided is a Cd-free blue fluorescent quantum dot with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHIM is 25 nm or less. The quantum dot is preferably a na.nocrystal containing zinc and selenium or zinc and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Grant
    Filed: October 12, 2018
    Date of Patent: September 21, 2021
    Assignee: NS MATERIALS INC.
    Inventors: Yuko Ogura, Yuka Takamizuma, Kazunori Iida, Emi Tsutsumi, Masanori Tanaka, Soichiro Nikata
  • Publication number: 20210189230
    Abstract: To provide a quantum dot-containing resin sheet or film, a method for producing the same, and a wavelength conversion member that can, in particular, solve the problem of aggregation of the quantum dots and the problem with the use of a scattering agent, suppress a decrease in light conversion efficiency, and improve the light conversion efficiency of a resin molded product containing quantum dots. The quantum dot-containing resin sheet or film of the present invention includes a stack of a plurality of resin layers, at least one of the resin layers containing quantum dots, and the plurality of resin layers is integrally molded through co-extrusion.
    Type: Application
    Filed: October 15, 2018
    Publication date: June 24, 2021
    Applicant: NS MATERIALS Inc.
    Inventors: Kazunori IIDA, Emi TSUTSUMI, Mika NIWAKI, Jun KANENO, Soichiro NIKATA, Hidetoshi TANAKA
  • Publication number: 20200347296
    Abstract: Provided is a Cd-free blue fluorescent quantum dot with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHIM is 25 nm or less. The quantum dot is preferably a na.nocrystal containing zinc and selenium or zinc and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Application
    Filed: October 12, 2018
    Publication date: November 5, 2020
    Applicant: NS MATERIALS INC.
    Inventors: Yuko OGURA, Yuka TAKAMIZUMA, Kazunori IIDA, Emi TSUTSUMI, Masanori TANAKA, Soichiro NIKATA
  • Publication number: 20200347289
    Abstract: To provide a resin molded product, a method for producing the same, and a wavelength conversion member that can suppress a decrease in the light conversion efficiency. The resin molded product of the present invention contains quantum dots and resin, the resin includes two or more components and is molded through extrusion molding or injection molding. In the present invention, the two or more components of the resin are preferably amorphous transparent resin that are incompatible. In the present invention, the quantum dots preferably include two or more types of quantum dots with different fluorescence wavelengths, and the respective types of quantum dots are dispersed in different resin phases.
    Type: Application
    Filed: October 16, 2018
    Publication date: November 5, 2020
    Applicant: NS MATERIALS INC.
    Inventors: Kazunori IIDA, Emi TSUTSUMI, Hidetoshi TANAKA
  • Publication number: 20200212256
    Abstract: The present invention seeks to provide cadmium-free quantum dots with a narrow fluorescence FWHM. The quantum dot does not contain cadmium and its fluorescence FWHM is 30 nm or less. The quantum dot is preferably a nanocrystal containing zinc and tellurium or zinc and tellurium and sulfur or zinc and tellurium and selenium and sulfur. Further, the quantum dot preferably has a core-shell structure in which the nanocrystal serves as a core and the surface of the core is coated with a shell.
    Type: Application
    Filed: July 27, 2018
    Publication date: July 2, 2020
    Applicant: NS MATERIALS INC.
    Inventors: Kazunori IIDA, Emi TSUTSUMI, Yuko OGURA, Masanori TANAKA, Soichiro NIKATA, Yuka TAKAMIZUMA