Patents by Inventor Hiroaki Isago

Hiroaki Isago 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).

  • Water-soluble phthalocyanine dye
    Patent number: 8524890
    Abstract: The invention has for its object to provide a water-soluble phthalocyanine dye unlikely to lose its own properties even upon dissolved in a concentration as high as 10?5 M. The inventive water-soluble phthalocyanine dye is characterized by having a sulfuric acid group or groups as an axial ligand or ligands of an antimony/phthalocyanine complex. The sulfuric acid group or groups have been introduced by replacing a part or the whole of hydroxyl groups in the starting material with a sulfuric acid group or groups.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: September 3, 2013
    Assignee: National Institute for Materials Science
    Inventors: Hiroaki Isago, Yutaka Kagaya, Youichi Oyama, Harumi Fujita
  • WATER-SOLUBLE PHTHALOCYANINE DYE
    Publication number: 20110301344
    Abstract: The invention has for its object to provide a water-soluble phthalocyanine dye unlikely to lose its own properties even upon dissolved in a concentration as high as 10?5 M. The inventive water-soluble phthalocyanine dye is characterized by having a sulfuric acid group or groups as an axial ligand or ligands of an antimony/phthalocyanine complex. The sulfuric acid group or groups have been introduced by replacing a part or the whole of hydroxyl groups in the starting material with a sulfuric acid group or groups. See FIG. 4.
    Type: Application
    Filed: February 24, 2010
    Publication date: December 8, 2011
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Hiroaki Isago, Yutaka Kagaya, Youichi Oyama, Harumi Fujita
  • Phthalocyanine radical anions and process for producing the same
    Patent number: 6136966
    Abstract: A phthalocyanine radical anion stable in ambient atmosphere, which is formed by subjecting a salt containing dihalogeno(phthalocyaninato)antimony (V) cation to a one-electron reduction. According to the present invention, a phthalocyaninc radical stable in ambient atmosphere, which is expected to be developed as an n-type organic semiconductor, is provided.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: October 24, 2000
    Assignee: National Research Institute for Metals
    Inventors: Hiroaki Isago, Yutaka Kagaya, Md. Hasan Zahir