Patents by Inventor Akito Masuhara

Akito Masuhara 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 concentrating nanoparticles and method of deaggregating aggregated nanoparticles
    Patent number: 8679341
    Abstract: A method of concentrating nanoparticles, having the steps of: adding and mixing an extraction solvent with a nanoparticles-dispersion liquid that nanoparticles are dispersed in a dispersion solvent, thereby concentrating and extracting the nanoparticles into a phase of the extraction solvent, and removing the dispersion solvent by filter-filtrating a liquid of concentrated extract, in which the extraction solvent is substantially incompatible with the dispersion solvent, and the extract solvent can form an interface after the extraction solvent is mixed with the dispersion solvent and left the mixture still; further a method of deaggregating aggregated nanoparticles, having the steps of: applying two or more ultrasonic waves different in frequency to a liquid containing aggregated nanoparticles, and thereby fining and dispersing the aggregated nanoparticles.
    Type: Grant
    Filed: May 8, 2006
    Date of Patent: March 25, 2014
    Assignees: FUJIFILM Corporation, Tohoku University
    Inventors: Yousuke Miyashita, Hachiro Nakanishi, Hitoshi Kasai, Akito Masuhara
  • Method of concentrating nanoparticles and method of deaggregating aggregated nanoparticles
    Publication number: 20090071908
    Abstract: A method of concentrating nanoparticles, having the steps of: adding and mixing an extraction solvent with a nanoparticles-dispersion liquid that nanoparticles are dispersed in a dispersion solvent, thereby concentrating and extracting the nanoparticles into a phase of the extraction solvent, and removing the dispersion solvent by filter-filtrating a liquid of concentrated extract, in which the extraction solvent is substantially incompatible with the dispersion solvent, and the extract solvent can form an interface after the extraction solvent is mixed with the dispersion solvent and left the mixture still; further a method of deaggregating aggregated nanoparticles, having the steps of: applying two or more ultrasonic waves different in frequency to a liquid containing aggregated nanoparticles, and thereby fining and dispersing the aggregated nanoparticles.
    Type: Application
    Filed: May 8, 2006
    Publication date: March 19, 2009
    Applicants: FUJIFILM CORPORATION, TOHOKU UNIVERSITY
    Inventors: Yousuke Miyashita, Hachiro Nakanishi, Hitoshi Kasai, Akito Masuhara
  • Method of bioimaging using nanocrystals of fluorescent dyes
    Publication number: 20070086949
    Abstract: This invention provides nanocrystals or polymer doped nanocrystals of hydrophobic organic fluorescent dyes as stable dispersions in an aqueous system. The dispersions can be prepared without stabilizers such as surfactants and the like. The aqueous dispersions of the nanocrystals or the polymer doped nanocrystals can be used for bioimaging.
    Type: Application
    Filed: June 20, 2006
    Publication date: April 19, 2007
    Inventors: Paras Prasad, Koichi Baba, Haridas Pudavar, Indrajit Roy, Tymish Ohulchanskyy, Hachiro Nakanishi, Akito Masuhara, Hitoshi Kasai