Patents by Inventor Hiromu KUMAGAI

Hiromu KUMAGAI 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).

  • POLYETHER ETHER KETONE, COMPOSITION, AND SHEET
    Publication number: 20240026077
    Abstract: Provided is a polyether ether ketone, comprising a repeating unit represented by the following formula (1), satisfying one or both of the following conditions (A) and (B), and having a hydroxy group at one terminal or both terminals of a main chain of the polyether ether ketone: (A) a fluorine atom content a is less than 2 mg/kg; and (B) a chlorine atom content b is 2 mg/kg or more.
    Type: Application
    Filed: September 2, 2021
    Publication date: January 25, 2024
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Koichi SUGA, Minoru SENGA, Hiromu KUMAGAI, Yuko MURAKAMI
  • POLYETHER ETHER KETONE AND METHOD FOR PRODUCING POLYETHER ETHER KETONE
    Publication number: 20230265244
    Abstract: Provided is a polyether ether ketone, comprising a repeating unit represented by the following formula (1), the polyether ether ketone having a crystallization temperature Tc of 255° C. or more, and satisfying one or both of the following conditions (A) and (B): (A) a fluorine atom content a is less than 2 mg/kg; and (B) a chlorine atom content b is 2 mg/kg or more.
    Type: Application
    Filed: September 2, 2021
    Publication date: August 24, 2023
    Applicant: IDEMITSU KOSAN CO.,LTD.
    Inventors: Koichi SUGA, Minoru SENGA, Hiromu KUMAGAI, Yuko MURAKAMI
  • METHOD FOR PRODUCING AROMATIC POLYETHER, AND POTASSIUM CARBONATE USED IN SAME
    Publication number: 20230265245
    Abstract: Provided is a method for producing an aromatic polyether, comprising reacting 4,4?-dichlorobenzophenone and hydroquinone in the presence of a potassium carbonate satisfying at least one of the following conditions (A) and (B): (A) the potassium carbonate has a bulk density of 1.2 g/ml or less; and (B) an average particle diameter D (µm) and a specific surface area S (m2/g) of the potassium carbonate satisfy D/S?600.
    Type: Application
    Filed: September 2, 2021
    Publication date: August 24, 2023
    Applicant: IDEMITSU KOSAN CO.,LTD.
    Inventors: Koichi SUGA, Minoru SENGA, Hiromu KUMAGAI, Yuko MURAKAMI
  • Grease composition, mechanism component, and production method for grease composition
    Patent number: 11542453
    Abstract: The present invention addresses a problem of providing a grease composition that uses hydrophilic nanofibers but still has excellent water resistance and does not readily experience oil separation. The grease composition contains a base oil, hydrophilic nanofibers having a thickness (d) of 1 to 500 nm, and an organic bentonite.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: January 3, 2023
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Yusuke Nakanishi, Hiromu Kumagai
  • GREASE COMPOSITION, MECHANISM COMPONENT, AND PRODUCTION METHOD FOR GREASE COMPOSITION
    Publication number: 20210009916
    Abstract: The present invention addresses a problem of providing a grease composition that uses hydrophilic nanofibers but still has excellent water resistance and does not readily experience oil separation. The grease composition contains a base oil, hydrophilic nanofibers having a thickness (d) of 1 to 500 nm, and an organic bentonite.
    Type: Application
    Filed: March 26, 2019
    Publication date: January 14, 2021
    Applicant: IDEMITSU KOSAN CO.,LTD.
    Inventors: Yusuke NAKANISHI, Hiromu KUMAGAI
  • Grease, mechanical component, and method for producing grease
    Patent number: 10829711
    Abstract: Provided is a grease containing a base oil and a hydrophilic nanofiber, the hydrophilic nanofiber having a thickness (d) of 0.01 to 500 nm being dispersed therein. The grease is low in an environmental load and excellent in safety on the human body and also has an appropriate worked penetration and has a high dropping point, and therefore, it is also excellent in heat resistance.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: November 10, 2020
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Yusuke Nakanishi, Hiromu Kumagai
  • Grease and method for manufacturing grease
    Patent number: 10704010
    Abstract: A grease of the invention contains a base oil and a thickener, where, when the volumetric-based arithmetic mean particle size of particles contained in the grease measured using laser diffraction/scattering method is A (unit: ?m), a formula A?3 (1) is satisfied.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: July 7, 2020
    Assignee: IDEMITSU KOSAN CO., LTD.
    Inventors: Yoshiyuki Suetsugu, Hiromu Kumagai
  • GREASE, MECHANICAL COMPONENT, AND METHOD FOR PRODUCING GREASE
    Publication number: 20180079983
    Abstract: Provided is a grease containing a base oil and a hydrophilic nanofiber, the hydrophilic nanofiber having a thickness (d) of 0.01 to 500 nm being dispersed therein. The grease is low in an environmental load and excellent in safety on the human body and also has an appropriate worked penetration and has a high dropping point, and therefore, it is also excellent in heat resistance.
    Type: Application
    Filed: April 27, 2016
    Publication date: March 22, 2018
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Yusuke NAKANISHI, Hiromu KUMAGAI
  • GREASE AND METHOD FOR MANUFACTURING GREASE
    Publication number: 20180037842
    Abstract: A grease of the invention contains a base oil and a thickener, where, when the volumetric-based arithmetic mean particle size of particles contained in the grease measured using laser diffraction/scattering method is A (unit: ?m), a formula A?3 (1) is satisfied.
    Type: Application
    Filed: February 4, 2016
    Publication date: February 8, 2018
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventors: Yoshiyuki SUETSUGU, Hiromu KUMAGAI