Patents by Inventor Shoki MATSUDA

Shoki MATSUDA 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).

  • Cyan toner, developer, toner accommodating unit, image forming apparatus, and image forming method
    Patent number: 11841679
    Abstract: A cyan toner is provided. The cyan toner comprises toner particles each comprising a binder resin and a colorant. From 1.0% to 20.0% by number of the toner particles have a CH rate of 7.0% or more in absolute value. The CH rate is calculated from the following formula (1): CH rate (%)=[(In?Iave)/Iave]×100??Formula (1) where, in a Raman spectrum of each toner particle, In represents an integrated intensity within a wavenumber region of from 2,600 to 3,180 cm?1 when an intensity at a wavenumber ? within a wavenumber region of from 2,600 to 2,800 cm?1 is s normalized to 1, where a total intensity of all the toner particles is maximum at the wavenumber ?; and Iave represents an average of the In.
    Type: Grant
    Filed: June 2, 2021
    Date of Patent: December 12, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiyori Fujino, Keisuke Tada, Shoki Matsuda, Fumihiko Chimoto, Ayumi Satoh
  • CYAN TONER, DEVELOPER, TONER ACCOMMODATING UNIT, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
    Publication number: 20210397105
    Abstract: A cyan toner is provided. The cyan toner comprises toner particles each comprising a binder resin and a colorant. From 1.0% to 20.0% by number of the toner particles have a CH rate of 7.0% or more in absolute value. The CH rate is calculated from the following formula (1): CH rate (%)=[(In?Iave)/Iave]×100??Formula (1) where, in a Raman spectrum of each toner particle, In represents an integrated intensity within a wavenumber region of from 2,600 to 3,180 cm?1 when an intensity at a wavenumber ? within a wavenumber region of from 2,600 to 2,800 cm?1 is s normalized to 1, where a total intensity of all the toner particles is maximum at the wavenumber ?; and Iave represents an average of the In.
    Type: Application
    Filed: June 2, 2021
    Publication date: December 23, 2021
    Inventors: Hiyori FUJINO, Keisuke TADA, Shoki MATSUDA, Fumihiko CHIMOTO, Ayumi SATOH
  • MAGENTA TONER, DEVELOPER, TONER ACCOMMODATING UNIT, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
    Publication number: 20210286279
    Abstract: A magenta toner is provided. The magenta toner comprises toner particles each comprising a binder resin and a colorant. From 1.0% to 25.0% by number of the toner particles have a CH rate of 25.0% or more in absolute value. The CH rate is calculated from the following formula (1): CH rate (%)=[(In?Iave)/Iave]×100??Formula (1) where, in a Raman spectrum of each toner particle, In represents an integrated intensity within a wavenumber region of from 2,750 to 3,250 cm?1 when an intensity at a wavenumber ? within a wavenumber region of from 1,200 to 3,250 cm?1 is s normalized to 1, where a total intensity of all the toner particles is maximum at the wavenumber ?; and Iave represents an average of the In.
    Type: Application
    Filed: February 12, 2021
    Publication date: September 16, 2021
    Inventors: Hiyori FUJINO, Keisuke TADA, Shoki MATSUDA, Fumihiko CHIMOTO, Takashi OKANO, Ayumi SATOH
  • Yellow toner, developer, process cartridge, image forming apparatus, and image forming method
    Patent number: 10859934
    Abstract: A yellow toner is provided. The yellow toner comprises toner particles each comprising a binder resin and a colorant, and 1.0% to 15.0% by number of the toner particles have a CH rate of 25.0% or more in absolute value. Here, the CH rate is calculated from the following formula (1): CH rate (%)=[(In?Iave)/Iave]×100??Formula (1) where In represents an integrated intensity within a wavenumber region of from 2,750 to 3,250 cm?1 when an intensity at a wavenumber ? within a wavenumber region of from 950 to 3,250 cm?1 is normalized to 1 in a Raman spectrum of each toner particle; and Iave represents an average of the In.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: December 8, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiyori Fujino, Shoki Matsuda, Fumihiko Chimoto, Keisuke Tada, Daisuke Misawa
  • YELLOW TONER, DEVELOPER, PROCESS CARTRIDGE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD
    Publication number: 20200209772
    Abstract: A yellow toner is provided. The yellow toner comprises toner particles each comprising a binder resin and a colorant, and 1.0% to 15.0% by number of the toner particles have a CH rate of 25.0% or more in absolute value. Here, the CH rate is calculated from the following formula (1): CH rate (%)=[(In?Iave)/Iave]×100??Formula (1) where In represents an integrated intensity within a wavenumber region of from 2,750 to 3,250 cm?1 when an intensity at a wavenumber ? within a wavenumber region of from 950 to 3,250 cm?1 is normalized to 1 in a Raman spectrum of each toner particle; and Iave represents an average of the In.
    Type: Application
    Filed: December 27, 2019
    Publication date: July 2, 2020
    Inventors: Hiyori FUJINO, Shoki MATSUDA, Fumihiko CHIMOTO, Keisuke TADA, Daisuke MISAWA