Patents by Inventor Jinya Katamachi

Jinya Katamachi 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 OF MANUFACTURING GRANULAR POLYARYLENE SULFIDE, AND GRANULAR POLYARYLENE SULFIDE
    Publication number: 20180171078
    Abstract: To provide: a method of manufacturing granular polyarylene sulfide (PAS) with improved particle strength while improving the yield of the granular PAS by introducing and recovering PAS with a moderate molecular weight in granular PAS; and granular PAS. A method of manufacturing granular PAS according to the present invention includes: a polymerizing step of subjecting a dihalo aromatic compound and at least one type of sulfur source selected from the group consisting of alkali metal sulfides and alkali metal hydrosulfides to polymerization reaction in an organic amide solvent; and a cooling step of cooling the reaction product mixture after the polymerizing step. Addition of a phase separation agent to the reaction product mixture is started at a point in time from the start of the polymerizing step to before the start of forming granular PAS in the cooling step, and when the temperature of the reaction product mixture is 245° C.
    Type: Application
    Filed: June 10, 2016
    Publication date: June 21, 2018
    Inventors: TAKAYUKI KIMURA, JINYA KATAMACHI, KENJI SUZUKI, HIROHITO KAWAMA
  • Branched polyethylene glycol and use thereof
    Patent number: 9327034
    Abstract: The present invention allows formation of covalent bonds in a bioactive compound having at least one amino group so as to efficiently provide the compound modified with PEG. The present invention thus provides a functionalized polyethylene glycol having a structure that allows reaction of two aldehyde groups with one amino group to form two covalent bonds.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: May 3, 2016
    Assignee: UNIVERSITY OF TSUKUBA, A JAPANESE NATIONAL UNIVERSITY
    Inventors: Yukio Nagasaki, Yutaka Ikeda, Hiromichi Kawasaki, Jinya Katamachi
  • NOVEL BRANCHED POLYETHYLENE GLYCOL AND USE THEREOF
    Publication number: 20140329290
    Abstract: The present invention allows formation of covalent bonds in a bioactive compound having at least one amino group so as to efficiently provide the compound modified with PEG. The present invention thus provides a functionalized polyethylene glycol having a structure that allows reaction of two aldehyde groups with one amino group to form two covalent bonds.
    Type: Application
    Filed: December 13, 2012
    Publication date: November 6, 2014
    Inventors: Yukio Nagasaki, Yutaka Ikeda, Hiromichi Kawasaki, Jinya Katamachi