Patents by Inventor Yuki NARUKAWA

Yuki NARUKAWA 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).

  • Electrostatic charge image developing toner
    Patent number: 11194261
    Abstract: The present invention relates to an electrostatic charge image developing toner having a ratio of TP2/TP1 of 1.47 to 2.35, wherein a first measurement value of a tan ? maximal value measured in 40° C. to 80° C. by a rheometer is set as the TP1, and a second measurement value of a tan ? maximal value measured in 40° C. to 80° C. by the rheometer is set as the TP2.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: December 7, 2021
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masaya Ota, Tomoko Nakagawa, Yuki Narukawa, Masaaki Okamoto
  • Electrostatic charge image developing toner
    Patent number: 10725392
    Abstract: The present invention relates to an electrostatic charge image developing toner, wherein when a tan ? measurement is performed twice by a rheometer, in the first measurement, a tan ? value measured at 130° C. is set as TP1 (130° C.), and a tan ? value measured at 140° C. is set as TP1 (140° C.), in the second measurement, a tan ? value measured at 140° C. is set as TP2 (140° C.), TP2 (140° C.)/TP1(140° C.) is equal to or smaller than 0.95, and TP1 (130° C.) is equal to or greater than 2.5.
    Type: Grant
    Filed: July 19, 2019
    Date of Patent: July 28, 2020
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Kumiko Kameya, Tomoko Nakagawa, Yuki Narukawa, Masaya Ota, Tetsuharu Yuge
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER
    Publication number: 20200117108
    Abstract: The present invention relates to an electrostatic charge image developing toner having a ratio of TP2/TP1 of 1.47 to 2.35, wherein a first measurement value of a tan ? maximal value measured in 40° C. to 80° C. by a rheometer is set as the TP1, and a second measurement value of a tan ? maximal value measured in 40° C. to 80° C. by the rheometer is set as the TP2.
    Type: Application
    Filed: December 16, 2019
    Publication date: April 16, 2020
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Masaya OTA, Tomoko NAKAGAWA, Yuki NARUKAWA, Masaaki OKAMOTO
  • Electrostatic charge image developing toner
    Patent number: 10551755
    Abstract: The present invention relates to an electrostatic charge image developing toner having a ratio of TP2/TP1 of 1.47 to 2.35, wherein a first measurement value of a tan ? maximal value measured in 40° C. to 80° C. by a rheometer is set as the TP1, and a second measurement value of a tan ? maximal value measured in 40° C. to 80° C. by the rheometer is set as the TP2.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: February 4, 2020
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masaya Ota, Tomoko Nakagawa, Yuki Narukawa, Masaaki Okamoto
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER
    Publication number: 20190339630
    Abstract: The present invention relates to an electrostatic charge image developing toner, wherein when a tan ? measurement is performed twice by a rheometer, in the first measurement, a tan ? value measured at 130° C. is set as TP1 (130° C.), and a tan ? value measured at 140° C. is set as TP1 (140° C.), in the second measurement, a tan ? value measured at 140° C. is set as TP2 (140° C.), TP2 (140° C.)/TP1(140° C.) is equal to or smaller than 0.95, and TP1 (130° C.) is equal to or greater than 2.5.
    Type: Application
    Filed: July 19, 2019
    Publication date: November 7, 2019
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Kumiko KAMEYA, Tomoko Nakagawa, Yuki Narukawa, Masaya Ota, Tetsuharu Yuge
  • ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER
    Publication number: 20180299800
    Abstract: The present invention relates to an electrostatic charge image developing toner having a ratio of TP2/TP1 of 1.47 to 2.35, wherein a first measurement value of a tan ? maximal value measured in 40° C. to 80° C. by a rheometer is set as the TP1, and a second measurement value of a tan ? maximal value measured in 40° C. to 80° C. by the rheometer is set as the TP2.
    Type: Application
    Filed: June 26, 2018
    Publication date: October 18, 2018
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Masaya OTA, Tomoko NAKAGAWA, Yuki NARUKAWA, Masaaki OKAMOTO