Patents by Inventor Takahiro SAKA

Takahiro SAKA 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).

  • Patent number: 11230659
    Abstract: A filling material for underground treatment of the present invention contains at least one polyvinyl alcohol-based resin of a modified polyvinyl alcohol-based resin and an unmodified polyvinyl alcohol, and a swelling ratio of the polyvinyl alcohol-based resin after immersion in water at a temperature of 80° C. for 30 minutes is 250% to 900%. The filling material for underground treatment has enhanced swelling performance, is effective in preventing phenomena such as lost circulation, and has improved workability of filling a well drilled part with the filling material.
    Type: Grant
    Filed: June 24, 2020
    Date of Patent: January 25, 2022
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Takahiro Saka, Masaya Nakai
  • Publication number: 20210309909
    Abstract: An object of the present invention is to provide a diverting agent that does not completely dissolve for a certain period of time (about 5 minutes to 3 hours) and has high cohesiveness between particles. The present invention relates to a diverting agent containing a polyvinyl alcohol-based resin having a degree of saponification of 65 mol % to 95 mol %.
    Type: Application
    Filed: June 21, 2021
    Publication date: October 7, 2021
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Yasuhiro HIRANO, Takahiro SAKA, Ryosuke TANIGUCHI, Chizuko FURO
  • Publication number: 20210309911
    Abstract: An object of the present invention is to provide a diverting agent that exhibits sufficient filling properties against a fracture in a well because of swelling without completely dissolution for a certain period of time (about 30 minutes to 5 hours), and that quickly dissolves and be removed even at a low temperature of 40° C. to 60° C. after a certain period of time has passed. The present invention relates to a diverting agent containing a modified polyvinyl alcohol-based resin.
    Type: Application
    Filed: June 22, 2021
    Publication date: October 7, 2021
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yasuhiro HIRANO, Takahiro SAKA, Ryosuke TANIGUCHI, Chizuko FURO
  • Publication number: 20210309910
    Abstract: An object of the present invention is to provide a diverting agent that can exhibit sufficient filling properties against a fracture in a well in an excavation method using a hydraulic fracturing method, and that is excellent in solubility after a predetermined period of time has passed. The diverting agent of the present invention contains a polyvinyl alcohol-based resin having an average polymerization degree of 1000 or more.
    Type: Application
    Filed: June 21, 2021
    Publication date: October 7, 2021
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Yasuhiro HIRANO, Takahiro SAKA, Ryosuke TANIGUCHI, Chizuko FURO
  • Publication number: 20200325383
    Abstract: The present invention provides a filling material for underground treatment, which has excellent swelling performance, is effective in preventing phenomena such as lost circulation, and has improved workability of filling a well drilled part with the filling material. The filling material for underground treatment of the present invention contains at least one polyvinyl alcohol-based resin of a modified polyvinyl alcohol-based resin and an unmodified polyvinyl alcohol, and a swelling ratio of the polyvinyl alcohol-based resin after immersion in water at a temperature of 80° C. for 30 minutes is 250% to 900%.
    Type: Application
    Filed: June 24, 2020
    Publication date: October 15, 2020
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Takahiro SAKA, Masaya NAKAI
  • Publication number: 20200317985
    Abstract: The diverting agent of the present invention contains resin particles of polyvinyl alcohol-based resin. The resin particles of polyvinyl alcohol-based resin are a particle mixture containing two or more types of resin particles having different particle diameters, and the diverting agent contains resin particles A of polyvinyl alcohol-based resin having a particle diameter of 1,700 ?m or more in a range of 5 mass % to 95 mass % and resin particles B of polyvinyl alcohol-based resin having a particle diameter of 250 ?m to 1,000 ?m in a range of 5 mass % to 95 mass %.
    Type: Application
    Filed: June 24, 2020
    Publication date: October 8, 2020
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Tomoya FUJITA, Takahiro SAKA, Chizuko FURO
  • Publication number: 20200172796
    Abstract: A problem to be solved of the present invention is to provide a diverting agent which gradually dissolves in water. The present invention relates to a diverting agent containing a polyvinyl alcohol-based resin and a method of filling a fracture using the diverting agent.
    Type: Application
    Filed: February 5, 2020
    Publication date: June 4, 2020
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Kazutoshi TSUJI, Norihito SAKAI, Tomoya FUJITA, Takahiro SAKA, Chizuko FURO
  • Patent number: 10550038
    Abstract: A cement admixture includes a crosslinked product of a modified polyvinyl alcohol-based resin, wherein the dissolution rate of 1 g of the crosslinked product of a modified polyvinyl alcohol-based resin for 1 liter of water at 70° C. is 50% or less.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: February 4, 2020
    Assignee: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takahiro Saka, Chizuko Furo, Shusaku Mandai
  • Publication number: 20180362404
    Abstract: Conventional methods suffer from unsatisfactory performance of the dehydration-preventing agent at a high temperature, and the present invention provides a cement admixture exhibiting an excellent dehydration-preventing effect at a high temperature. The cement admixture of the present invention includes a crosslinked product of a modified polyvinyl alcohol-based resin, wherein the dissolution rate of 1 g of the crosslinked product of a modified polyvinyl alcohol-based resin for 1 liter of water at 70° C. is 50% or less.
    Type: Application
    Filed: December 6, 2016
    Publication date: December 20, 2018
    Applicant: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takahiro SAKA, Chizuko FURO, Shusaku MANDAI
  • Patent number: 10111421
    Abstract: Disclosed is a dispersing agent for agrochemicals, said dispersing agent which comprises a modified polyvinyl alcohol-based resin containing a structural unit having a nonionic hydrophilicity group in side chain, and having a saponification degree of 95 mol % or more. The dispersing agent for agrochemicals can provide a dispersion in which a hardly water-soluble agrochemical active ingredient employed for a dispersoid is dispersed in a stable state even in the case where the dispersoid has a relatively large particle size.
    Type: Grant
    Filed: February 9, 2017
    Date of Patent: October 30, 2018
    Assignee: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takahiro Saka, Chizuko Furo, Shusaku Mandai
  • Publication number: 20170150713
    Abstract: Disclosed is a dispersing agent for agrochemicals, said dispersing agent which comprises a modified polyvinyl alcohol-based resin containing a structural unit having a nonionic hydrophilicity group in side chain, and having a saponification degree of 95 mol % or more. The dispersing agent for agrochemicals can provide a dispersion in which a hardly water-soluble agrochemical active ingredient employed for a dispersoid is dispersed in a stable state even in the case where the dispersoid has a relatively large particle size.
    Type: Application
    Filed: February 9, 2017
    Publication date: June 1, 2017
    Applicant: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takahiro SAKA, Chizuko FURO, Shusaku MANDAI