Patents by Inventor Kazusa HITOUJI

Kazusa HITOUJI 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).

  • Composite semipermeable membrane and spiral wound separation membrane element
    Patent number: 11207645
    Abstract: The purpose of the present invention is to provide: a composite semipermeable membrane which has three excellent properties, namely, excellent ionic substance rejecting property, excellent nonionic substance rejecting property and excellent water permeability in a practically balanced manner, and a spiral wound separation membrane element which comprises this composite semipermeable membrane. A composite semipermeable membrane according to the present invention is obtained by forming a skin layer that contains a polyamide-based resin on a surface of a porous support, and is configured such that: the polyamide-based resin is obtained by polymerizing a polyfunctional acid halide component and a polyfunctional amine component; the polyfunctional amine component contains m-phenylenediamine and at least one diamine compound represented by general formula (1); and a ratio (mol %) of a segment (A) derived from m-phenylenediamine and a segment (B) derived from the diamine compound in the polyamide-based resin is 99.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: December 28, 2021
    Assignee: NITTO DENKO CORPORATION
    Inventors: Tomotsugu Miyabe, Masashi Echizen, Kazusa Hitouji
  • COMPOSITE SEMIPERMEABLE MEMBRANE AND SPIRAL WOUND SEPARATION MEMBRANE ELEMENT
    Publication number: 20200061548
    Abstract: The purpose of the present invention is to provide: a composite semipermeable membrane which has three excellent properties, namely, excellent ionic substance rejecting property, excellent nonionic substance rejecting property and excellent water permeability in a practically balanced manner, and a spiral wound separation membrane element which comprises this composite semipermeable membrane. A composite semipermeable membrane according to the present invention is obtained by forming a skin layer that contains a polyamide-based resin on a surface of a porous support, and is configured such that: the polyamide-based resin is obtained by polymerizing a polyfunctional acid halide component and a polyfunctional amine component; the polyfunctional amine component contains m-phenylenediamine and at least one diamine compound represented by general formula (1); and a ratio (mol %) of a segment (A) derived from m-phenylenediamine and a segment (B) derived from the diamine compound in the polyamide-based resin is 99.
    Type: Application
    Filed: October 25, 2017
    Publication date: February 27, 2020
    Applicant: NITTO Denko Corporation
    Inventors: Tomotsugu MIYABE, Masashi ECHIZEN, Kazusa HITOUJI