Patents by Inventor Masahiro Aoi

Masahiro Aoi 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 for eluting a metal adsorbed on a chelating agent
    Patent number: 4786481
    Abstract: A method for eluting a metal adsorbed on a chelating agent with an eluent, which comprises using as the eluent an aqueous solution containing a water-soluble inorganic sulfide and a basic compound at concentrations of 0.005 to 3N and 0.1N or more, respectively.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: November 22, 1988
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yushin Kataoka, Masaaki Matsuda, Masahiro Aoi
  • Process for producing a chelate resin
    Patent number: 4605706
    Abstract: A chelate resin having a functional group of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each independently hydrogen, alkyl, aminoalkyl, phenyl or a substituted group thereof and another functional group of the formula: ##STR2## wherein R.sub.3 is amino, alkylamino, polyethylenepolyamino, hydrazo, hydrazino, hydrazono, amidino, guanidino, semicarbazide or a substituted group thereof, has an excellent adsorption capacity for metal ions.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: August 12, 1986
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yushin Kataoka, Masaaki Matsuda, Kenji Ochi, Masahiro Aoi
  • Process for eluting indium from a chelate resin containing adsorbed indium
    Patent number: 4565673
    Abstract: A process for eluting indium from a chelate resin having a phosphorus atom-containing, chelate-forming group which contains adsorbed indium, which comprises contacting said resin firstly with a primary eluent containing an acid containing no halogen atom in the molecule at a concentration of 0.1N or higher and then with an eluent for indium which is selected from the group consisting of (1) a solution of an acid containing a halogen atom in the molecule, (2) a mixed solution of (a) a metal halide, an ammonium halide or a mixture thereof and (b) an acid and (3) a mixed solution of a sulfide and a base compound.
    Type: Grant
    Filed: December 27, 1984
    Date of Patent: January 21, 1986
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yushin Kataoka, Masaaki Matsuda, Masahiro Aoi, Kunitake Chino
  • Chelate resin and process for producing the same
    Patent number: 4564659
    Abstract: A chelate resin having a functional group of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each independently hydrogen, alkyl, aminoalkyl, phenyl or a substituted group thereof and another functional group of the formula: ##STR2## wherein R.sub.3 is amino, alkylamino, polyethylenepolyamino, hydrazo, hydrazino, hydrazono, amidino, guanidino, semicarbazide or a substituted group thereof, has an excellent adsorption capacity for metal ions.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: January 14, 1986
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yushin Kataoka, Masaaki Matsuda, Kenji Ochi, Masahiro Aoi