Patents by Inventor Fumihiro HATAKEYAMA

Fumihiro HATAKEYAMA 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).

  • Method for producing dihydroxynaphthalene condensate and dihydroxynaphthalene condensate
    Patent number: 11267937
    Abstract: The invention provides: a dihydroxynaphthalene condensate which suppresses soft particle generation and is suitably usable for a composition excellent in filterability; and a method for producing the dihydroxynaphthalene condensate. In the method for producing a dihydroxynaphthalene condensate, dihydroxynaphthalene to be used has a sulfur element content of 100 ppm or less in terms of mass among constituent elements. The dihydroxynaphthalene and a condensation agent are condensed in presence of an acid or a base to produce the dihydroxynaphthalene condensate.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: March 8, 2022
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Daisuke Kori, Seiichiro Tachibana, Tsutomu Ogihara, Satoru Kitano, Yukio Abe, Fumihiro Hatakeyama, Taiki Kobayashi
  • METHOD FOR PRODUCING DIHYDROXYNAPHTHALENE CONDENSATE AND DIHYDROXYNAPHTHALENE CONDENSATE
    Publication number: 20190194391
    Abstract: The invention provides: a dihydroxynaphthalene condensate which suppresses soft particle generation and is suitably usable for a composition excellent in filterability; and a method for producing the dihydroxynaphthalene condensate, in the method for producing a dihydroxynaphthalene condensate, dihydroxynaphthalene to be used has a sulfur element content of 100 ppm or less in terms of mass among constituent elements. The dihydroxynaphthalene and a condensation agent are condensed in presence of an acid or a base to produce the dihydroxynaphthalene condensate.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 27, 2019
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Daisuke KORI, Seiichiro TACHIBANA, Tsutomu OGIHARA, Satoru KITANO, Yukio ABE, Fumihiro HATAKEYAMA, Taiki KOBAYASHI
  • METHOD FOR PURIFYING DIHYDROXYNAPHTHALENE
    Publication number: 20190194102
    Abstract: The invention provides a method for purifying dihydroxynaphthalene, which is capable of suppressing soft particle generation and obtaining dihydroxynaphthalene serving as a raw material of a resin and composition excellent in filterability. The method for purifying dihydroxynaphthalene includes the step of removing a sulfur content in the dihydroxynaphthalene with an adsorbent, and neutral alumina is used as the adsorbent.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 27, 2019
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Seiichiro TACHIBANA, Daisuke KORI, Tsutomu OGIHARA, Satoru KITANO, Yukio ABE, Fumihiro HATAKEYAMA, Taiki KOBAYASHI