Patents by Inventor Kazutoshi Tsuji

Kazutoshi Tsuji 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).

  • DIVERTING AGENT AND METHOD OF FILLING FRACTURE IN WELL USING THE SAME
    Publication number: 20230147740
    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: December 29, 2022
    Publication date: May 11, 2023
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kazutoshi TSUJI, Norihito SAKAI, Tomoya FUJITA, Takahiro SAKA, Chizuko FURO
  • Diverting agent and method of filling fracture in well using the same
    Patent number: 11597870
    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: Grant
    Filed: February 5, 2020
    Date of Patent: March 7, 2023
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Kazutoshi Tsuji, Norihito Sakai, Tomoya Fujita, Takahiro Saka, Chizuko Furo
  • DIVERTING AGENT AND METHOD OF FILLING FRACTURE IN WELL USING THE SAME
    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
  • Polyvinyl alcohol resin composition and molded article thereof
    Patent number: 8569414
    Abstract: Disclosed is a polyvinyl alcohol resin composition capable of providing a melt-molded article with superior gas barrier properties and flex crack resistance. The resin composition comprises (A) a PVA resin having 1,2-diol unit in side chain thereof; and (B) a mixture of block copolymers each having an aromatic vinyl polymer block, and a conjugated diene polymer block and/or hydrogenated thereof, wherein the (B) mixture of block copolymers includes (B1) a block copolymer having no carboxyl group and (B2) a block copolymer modified with a carboxyl group-containing compound.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: October 29, 2013
    Assignee: The Nippon Synthetic Chemical Industry Co., Ltd.
    Inventors: Mitsuo Shibutani, Kazutoshi Tsuji, Kaoru Inoue, Norihito Sakai
  • POLYVINYL ALCOHOL RESIN COMPOSITION AND MOLDED ARTICLE THEREOF
    Publication number: 20120157627
    Abstract: Disclosed is a polyvinyl alcohol resin composition capable of providing a melt-molded article with superior gas barrier properties and flex crack resistance. The resin composition comprises (A) a PVA resin having 1,2-diol unit in side chain thereof; and (B) a mixture of block copolymers each having an aromatic vinyl polymer block, and a conjugated diene polymer block and/or hydrogenated thereof, wherein the (B) mixture of block copolymers includes (B1) a block copolymer having no carboxyl group and (B2) a block copolymer modified with a carboxyl group-containing compound.
    Type: Application
    Filed: February 28, 2012
    Publication date: June 21, 2012
    Applicant: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
    Inventors: Mitsuo SHIBUTANI, Kazutoshi TSUJI, Kaoru INOUE, Norihito SAKAI
  • Pearl Like Polyvinyl Alcohol Particles, Production Process Thereof and Temporary Vascular Embolic Agent
    Publication number: 20090246166
    Abstract: The embodiments provide a temporary vascular embolic agent temporarily blocking the blood vessel in vivo, having appropriate dissolution speed suitable for use in the blood vessel in which blood flow is fast and being more superior in the passing property of a catheter and the controllability of embolization time than conventional one. The embolization of the blood vessel led to cardiac muscle in which blood flow speed is fast is enabled by the temporary vascular embolic agent of the present invention using the pearl like polyvinyl alcohol (PVA) particles having 0.1 to 2% by mol of a 1,2-diol configuration unit and having a saponification degree of at least 99% by mol.
    Type: Application
    Filed: March 25, 2009
    Publication date: October 1, 2009
    Applicant: The Nippon Synthetic Chemical Industry CO., LTD.
    Inventors: Mitsuo Shibutani, Kazutoshi Tsuji