Patents by Inventor Asako KYOBU

Asako KYOBU 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).

  • Tetracarboxylic dianhydride, polyimide precursor resin and solution thereof, and polyimide and solution thereof
    Patent number: 11525037
    Abstract: A tetracarboxylic dianhydride represented by the following general formula (1): [in the formula (1), R1, R2, and R3 each independently represent a hydrogen atom and the like, and n represents an integer of 0 to 12], wherein a ratio of a summed amount of a specific stereoisomer (A) and a specific stereoisomer (B) is 50% by mole or more relative to a total amount of stereoisomers based on three-dimensional configurations of two norbornane rings in the general formula (1), and a content ratio of the stereoisomer (A) is 30% by mole or more relative to the total amount of the stereoisomers.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: December 13, 2022
    Assignee: ENEOS CORPORATION
    Inventors: Shinichi Komatsu, Asako Kyobu
  • TETRACARBOXYLIC DIANHYDRIDE, CARBONYL COMPOUND, POLYIMIDE PRECURSOR RESIN, AND POLYIMIDE
    Publication number: 20210122724
    Abstract: A tetracarboxylic dianhydride which is a compound represented by the following general formula (1): [in the formula (1), A represents one selected from the group consisting of optionally substituted divalent aromatic groups in each of which the number of carbon atoms forming an aromatic ring is 6 to 30, and Ras each independently represent a hydrogen atom or the like], wherein 60% by mass or more of a stereoisomer contained in the compound is an exo/exo type stereoisomer represented by a specific general formula.
    Type: Application
    Filed: July 4, 2019
    Publication date: April 29, 2021
    Applicant: ENEOS Corporation
    Inventors: Daisuke WATANABE, Takahiro HASEGAWA, Asako KYOBU
  • TETRACARBOXYLIC DIANHYDRIDE, POLYIMIDE PRECURSOR RESIN AND SOLUTION THEREOF, AND POLYIMIDE AND SOLUTION THEREOF
    Publication number: 20200239636
    Abstract: A tetracarboxylic dianhydride represented by the following general formula (1): [in the formula (1), R1, R2, and R3 each independently represent a hydrogen atom and the like, and n represents an integer of 0 to 12], wherein a ratio of a summed amount of a specific stereoisomer (A) and a specific stereoisomer (B) is 50% by mole or more relative to a total amount of stereoisomers based on three-dimensional configurations of two norbornane rings in the general formula (1), and a content ratio of the stereoisomer (A) is 30% by mole or more relative to the total amount of the stereoisomers.
    Type: Application
    Filed: April 23, 2018
    Publication date: July 30, 2020
    Applicant: JXTG NIPPON OIL & ENERGY CORPORATION
    Inventors: Shinichi KOMATSU, Asako KYOBU
  • POLYIMIDE, POLYAMIC ACID, SOLUTIONS THEREOF, AND FILM USING POLYIMIDE
    Publication number: 20190322807
    Abstract: A polyimide, comprising at least one repeating unit selected from the group consisting of a repeating unit (A1) represented by a particular general formula, a repeating unit (B1) represented by a particular general formula, and a repeating unit (C1) represented by a particular general formula.
    Type: Application
    Filed: September 7, 2017
    Publication date: October 24, 2019
    Applicant: JXTG NIPPON OIL & ENERGY CORPORATION
    Inventors: Daisuke WATANABE, Rieko FUJISHIRO, Takahiro HASEGAWA, Asako KYOBU