Patents by Inventor Shohta Kobayashi

Shohta Kobayashi 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).

  • Toner, image forming method, image forming apparatus, and process cartridge
    Patent number: 11036152
    Abstract: Provided is a toner including a binder resin, a release agent, and a charge-controlling agent, wherein the toner includes toner particles having particle diameters of 3 micrometers or smaller, among the toner particles having particle diameters of 3 micrometers or smaller, a proportion of the toner particles having an average circularity of 0.70 or greater but 0.85 or less in all of the toner particles is 10% by number or greater but less than 20% by number and a proportion of the toner particles having an average circularity of less than 0.70 in all of the toner particles is 10% by number or less.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: June 15, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Shohta Kobayashi, Satoshi Ogawa, Yoshitaka Sekiguchi, Masayuki Ishii, Naoko Kitada
  • Toner, production method of toner, image forming method, image forming apparatus, and process cartridge
    Patent number: 10754270
    Abstract: Provided is a toner including a binder resin, and a charge-controlling agent, wherein a volume average particle diameter X of the toner after a stress treatment satisfies Formula (1), and an amount Y of fine toner particles having particle diameters of 3 micrometers or smaller and circularity of 0.70 or less satisfies Formula (2).
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: August 25, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoko Kitada, Satoshi Ogawa, Yoshitaka Sekiguchi, Masayuki Ishii, Shohta Kobayashi
  • TONER, PRODUCTION METHOD OF TONER, IMAGE FORMING METHOD, IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE
    Publication number: 20200174390
    Abstract: Provided is a toner including a binder resin, and a charge-controlling agent, wherein a volume average particle diameter X of the toner after a stress treatment satisfies Formula (1), and an amount Y of fine toner particles having particle diameters of 3 micrometers or smaller and circularity of 0.70 or less satisfies Formula (2).
    Type: Application
    Filed: February 15, 2018
    Publication date: June 4, 2020
    Inventors: Naoko KITADA, Satoshi OGAWA, Yoshitaka SEKIGUCHI, Masayuki ISHII, Shohta KOBAYASHI
  • TONER, TONER STORAGE UNIT, AND IMAGE FORMING APPARATUS
    Publication number: 20200026210
    Abstract: A toner is provided. The toner comprises a binder resin, a metal-containing azo dye, and a quaternary ammonium salt, has an average circularity of from 0.85 to 0.95, and is free of a tin compound having Sn—C bond.
    Type: Application
    Filed: April 30, 2019
    Publication date: January 23, 2020
    Inventors: Yu HIRAI, Masayuki Ishii, Hyo Shu, Masayuki Kakimoto, Yoshitaka Sekiguchi, Shohta Kobayashi, Shinya Hanatani, Kohtaroh Ogino, Yasuaki Iwamoto
  • TONER, IMAGE FORMING METHOD, IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE
    Publication number: 20200019076
    Abstract: Provided is a toner including a binder resin, a release agent, and a charge-controlling agent, wherein the toner includes toner particles having particle diameters of 3 micrometers or smaller, among the toner particles having particle diameters of 3 micrometers or smaller, a proportion of the toner particles having an average circularity of 0.70 or greater but 0.85 or less in all of the toner particles is 10% by number or greater but less than 20% by number and a proportion of the toner particles having an average circularity of less than 0.70 in all of the toner particles is 10% by number or less.
    Type: Application
    Filed: February 21, 2018
    Publication date: January 16, 2020
    Inventors: Shohta KOBAYASHI, Satoshi OGAWA, Yoshitaka SEKIGUCHI, Masayuki ISHII, Naoko KITADA
  • ALIPHATIC POLYESTER, METHOD OF PREPARING THE SAME, AND POLYMER ORGANIZER
    Publication number: 20150329668
    Abstract: An aliphatic polyester having a number-average molecular weight of from 500,000 to 2,000,000 includes an ester bonding site and an amide bonding site. The content of the amide bonding site is from 1×10?3% to 1×10?1% by mol based on total weight of the ester bonding site and the amide bonding site.
    Type: Application
    Filed: April 29, 2015
    Publication date: November 19, 2015
    Inventors: Kaori Miyahara, Taichi Nemoto, Yoko Arai, Susumu Chiba, Shohta Kobayashi, Yoshihito Shimada