Patents by Inventor Chizuru Hongo

Chizuru Hongo 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).

  • High-strength polypropylene fiber and method for producing the same
    Patent number: 9057148
    Abstract: A method for producing a polypropylene fiber, which can produce a high strength polypropylene fiber without using a special raw material and/or means is provided. The method for producing a polypropylene fiber includes the step of spinning a melt extruded fiber, the step of keeping cold, and the step of drawing, in which a ratio of a take-off speed with respect to an extrusion speed in the step of spinning the melt-extruded fiber is 50 to 750.
    Type: Grant
    Filed: May 30, 2011
    Date of Patent: June 16, 2015
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, THE UNIVERSITY OF TOKYO
    Inventors: Tatsuya Kitagawa, Tadahisa Iwata, Chizuru Hongo
  • HIGH-STRENGTH POLYPROPYLENE FIBER AND METHOD FOR PRODUCING THE SAME
    Publication number: 20140163169
    Abstract: A method for producing a polypropylene fiber, which can produce a high strength polypropylene fiber without using a special raw material and/or means is provided. The method for producing a polypropylene fiber includes the step of spinning a melt extruded fiber, the step of keeping cold, and the step of drawing, in which a ratio of a take-off speed with respect to an extrusion speed in the step of spinning the melt-extruded fiber is 50 to 750.
    Type: Application
    Filed: May 30, 2011
    Publication date: June 12, 2014
    Applicants: THE UNIVERSITY OF TOKYO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuya Kitagawa, Tadahisa Iwata, Chizuru Hongo
  • BIODEGRADABLE POLYESTER FIBER HAVING EXCELLENT THERMAL STABILITY AND STRENGTH, AND METHOD FOR PRODUCING SAME
    Publication number: 20140088288
    Abstract: The present invention aims to provide biodegradable polyester fibers excellent in thermal stability and fiber strength. Another aim is to provide a method for producing biodegradable polyester fibers excellent in mechanical properties, particularly in thermal stability. The present invention relates to biodegradable polyester fibers comprising a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) that has a 3HH molar fraction of 2 to 9 mol %. The present invention also relates to a method for producing the biodegradable polyester fibers, comprising a fiber forming step of melt-extruding a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) to form fibers at a temperature higher than or equal to the glass transition temperature of the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) but not higher than 70° C.
    Type: Application
    Filed: March 23, 2012
    Publication date: March 27, 2014
    Applicants: KANEKA CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Tadahisa Iwata, Chizuru Hongo, Masanobu Tamura