Patents by Inventor Riku SAWAI

Riku SAWAI 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).

  • Glass composition, glass fiber, glass cloth, and method for producing glass fiber
    Patent number: 11840477
    Abstract: The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40?SiO2?60, 25?B2O3?45, 0<Al2O3?18, 0<R2O?5, and 0?RO?12, and satisfies at least one of: i) SiO2+B2O3?80 and SiO2+B2O3+Al2O3?99.9; and ii) SiO2+B2O3?78, SiO2+B2O3+Al2O3?99.9, and 0<RO<10. Another glass composition provided includes SiO2, B2O3, Al2O3, R2O, and 3<RO<8 at the same contents as the above, and satisfies SiO2+B2O3?75 and SiO2+B2O3+Al2O3<97, where R2O=Li2O+Na2O+K2O and RO=MgO+CaO+SrO.
    Type: Grant
    Filed: August 3, 2022
    Date of Patent: December 12, 2023
    Assignees: NIPPON SHEET GLASS COMPANY, LIMITED, UNITIKA LTD., UNITIKA GLASS FIBER CO., LTD.
    Inventors: Aya Nakamura, Hidetoshi Fukuchi, Junji Kurachi, Riku Sawai, Takaharu Miyazaki, Yoshito Nawa, Kohji Hattori
  • Glass composition, glass fiber, glass cloth, and method for producing glass fiber
    Patent number: 11773009
    Abstract: The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40?SiO2?60, 25?B2O3?45, 0<Al2O3?18, 0<R2O?5, and 0?RO?12, and satisfies at least one of: i) SiO2+B2O3?80 and SiO2+B2O3+Al2O3?99.9; and ii) SiO2+B2O3?78, SiO2+B2O3+Al2O3?99.9, and 0<RO<10. Another glass composition provided includes SiO2, B2O3, Al2O3, R2O, and 3<RO<8 at the same contents as the above, and satisfies SiO2+B2O3?75 and SiO2+B2O3+Al2O3<97, where R2O?Li2O+Na2O+K2O and RO?MgO+CaO+SrO.
    Type: Grant
    Filed: August 3, 2022
    Date of Patent: October 3, 2023
    Assignees: NIPPON SHEET GLASS COMPANY, LIMITED, UNITIKA LTD., UNITIKA GLASS FIBER CO., LTD.
    Inventors: Aya Nakamura, Hidetoshi Fukuchi, Junji Kurachi, Riku Sawai, Takaharu Miyazaki, Yoshito Nawa, Kohji Hattori
  • GLASS COMPOSITION, GLASS FIBER, GLASS CLOTH, AND METHOD FOR PRODUCING GLASS FIBER
    Publication number: 20220402811
    Abstract: The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40?SiO2?60, 25?B2O3?45, 0<Al2O3?18, 0<R2O?5, and 0?RO?12, and satisfies at least one of: i) SiO2+B2O3?80 and SiO2+B2O3+Al2O3?99.9; and ii) SiO2+B2O3?78, SiO2+B2O3+Al2O3?99.9, and 0<RO<10. Another glass composition provided includes SiO2, B2O3, Al2O3, R2O, and 3<RO<8 at the same contents as the above, and satisfies SiO2+B2O3?75 and SiO2+B2O3+Al2O3<97, where R2O=Li2O+Na2O+K2O and RO=MgO+CaO+SrO.
    Type: Application
    Filed: August 3, 2022
    Publication date: December 22, 2022
    Inventors: Aya NAKAMURA, Hidetoshi FUKUCHI, Junji KURACHI, Riku SAWAI, Takaharu MIYAZAKI, Yoshito NAWA, Kohji HATTORI
  • GLASS COMPOSITION, GLASS FIBER, GLASS CLOTH, AND METHOD FOR PRODUCING GLASS FIBER
    Publication number: 20220371945
    Abstract: The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40?SiO2?60, 25?B2O3?45, 0<Al2O3?18, 0<R2O?5, and 0?RO?12, and satisfies at least one of: i) SiO2+B2O3?80 and SiO2+B2O3+Al2O3?99.9; and ii) SiO2+B2O3?78, SiO2+B2O3+Al2O3?99.9, and 0<RO<10. Another glass composition provided includes SiO2, B2O3, Al2O3, R2O, and 3<RO<8 at the same contents as the above, and satisfies SiO2+B2O3?75 and SiO2+B2O3+Al2O3<97, where R2O=Li2O+Na2O+K2O and RO=MgO+CaO+SrO.
    Type: Application
    Filed: August 3, 2022
    Publication date: November 24, 2022
    Inventors: Aya NAKAMURA, Hidetoshi FUKUCHI, Junji KURACHI, Riku SAWAI, Takaharu MIYAZAKI, Yoshito NAWA, Kohji HATTORI
  • GLASS COMPOSITION, GLASS FIBER, GLASS CLOTH, AND METHOD FOR PRODUCING GLASS FIBER
    Publication number: 20220324751
    Abstract: The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40?SiO2?60, 25?B2O3?45, 0?Al2O3?18, 0<R2O?5, and 0?RO?12, and satisfies at least one of: i) SiO2+B2O3?80 and SiO2+B2O3+Al2O3?99.9; and ii) SiO2+B2O3?78, SiO2+B2O3+Al2O3?99.9, and 0<RO<10. Another glass composition provided includes SiO2, B2O3, Al2O3, R2O, and 3<RO<8 at the same contents as the above, and satisfies SiO2+B2O3?75 and SiO2+B2O3+Al2O3<97, where R2O?Li2O+Na2O+K2O and RO?MgO+CaO+SrO.
    Type: Application
    Filed: June 19, 2020
    Publication date: October 13, 2022
    Inventors: Aya NAKAMURA, Hidetoshi FUKUCHI, Junji KURACHI, Riku SAWAI, Takaharu MIYAZAKI, Yoshito NAWA, Kohji HATTORI
  • Glass composition, glass fibers, glass cloth, and method for producing glass fibers
    Patent number: 11174191
    Abstract: A glass composition of the present disclosure includes, in wt %, 50?SiO2?56, 20?B2O3?30, 10?Al2O3?20, 3.5?MgO+CaO?10, and 0?R2O?1.0, further includes Fe2O3, and has a permittivity of less than 5.0 at a frequency of 1 MHz. R is at least one element selected from Li, Na, and K. The glass composition of the present disclosure is a low-permittivity glass composition with which the occurrence of fiber breakage during fiber forming can be reduced even when glass fibers to be formed have a small fiber diameter, and the occurrence of defects such as fiber breakage and fluffing during processing of the glass fibers can be reduced.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: November 16, 2021
    Assignees: NIPPON SHEET GLASS COMPANY, LIMITED, UNITIKA LTD., UNITIKA GLASS FIBER CO., LTD.
    Inventors: Yoshiyuki Inaka, Takaharu Miyazaki, Koji Hayashi, Riku Sawai, Yoshito Nawa, Daisuke Nishinaka, Tomoki Sekida
  • GLASS COMPOSITION, GLASS FIBERS, GLASS CLOTH, AND METHOD FOR PRODUCING GLASS FIBERS
    Publication number: 20200087196
    Abstract: A glass composition of the present disclosure includes, in wt %, 50?SiO2?56, 20?B2O3?30, 10?Al2O3?20, 3.5?MgO+CaO?10, and 0?R2O?1.0, further includes Fe2O3, and has a permittivity of less than 5.0 at a frequency of 1 MHz. R is at least one element selected from Li, Na, and K. The glass composition of the present disclosure is a low-permittivity glass composition with which the occurrence of fiber breakage during fiber forming can be reduced even when glass fibers to be formed have a small fiber diameter, and the occurrence of defects such as fiber breakage and fluffing during processing of the glass fibers can be reduced.
    Type: Application
    Filed: May 18, 2018
    Publication date: March 19, 2020
    Inventors: Yoshiyuki INAKA, Takaharu MIYAZAKI, Koji HAYASHI, Riku SAWAI, Yoshito NAWA, Daisuke NISHINAKA, Tomoki SEKIDA