Patents by Inventor Hajime Maki

Hajime Maki 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 producing an alpha-alumina powder
    Publication number: 20060073093
    Abstract: A method for producing an ?-alumina powder is provided. T method for producing an ?-alumina powder comprising steps of: (1) pulverizing a metal compound having a full width at half maximum (Ho) of a main peak in XRD pattern to obtain a seed crystal having a full width at half maximum (H) of the main peak in XRD pattern in the presence of pulverizing agent, (2) mixing the obtained seed crystal with an aluminum salt, (3) calcining the mixture, and wherein a ratio of H/Ho is 1.06 or more.
    Type: Application
    Filed: August 26, 2005
    Publication date: April 6, 2006
    Inventors: Hajime Maki, Yoshiaki Takeuchi, Kazuhisa Kajihara
  • Method for producing an alpha - alumina powder
    Publication number: 20050276745
    Abstract: A method for producing an ?-alumina powder is provided. The method for producing an ?-alumina powder comprises steps of (1) preparing a mixture of an aluminum hydrolysate, a seed crystal and water; (2) removing the water from the mixture; and (3) calcining the resultant, wherein the aluminum hydrolysate in the step (1) is produced by hydrolyzing an aqueous aluminum chloride solution under conditions of a pH of 5 or less and a temperature of 60° C. or less.
    Type: Application
    Filed: June 9, 2005
    Publication date: December 15, 2005
    Inventors: Hajime Maki, Yoshiaki Takeuchi
  • Method for producing an alpha-alumina powder
    Publication number: 20050214201
    Abstract: The present invention provides a method for producing an ?-alumina powder. The method for producing an ?-alumina powder comprises steps of: (1) pulverizing a metal compound having a full width at half maximum (Ho) of a main peak in XRD pattern to obtain a seed crystal having a full width at half maximum (H) of the main peak in XRD pattern, (2) mixing the obtained seed crystal with an aluminum compound, (3) calcining the mixture, and wherein a ratio of H/Ho is 1.06 or more.
    Type: Application
    Filed: March 14, 2005
    Publication date: September 29, 2005
    Inventors: Shinobu Maruno, Hajime Maki, Yoshiaki Takeuchi
  • Method for producing alpha-alumina particle
    Publication number: 20050201928
    Abstract: The present invention provides a method of producing an ?-alumina particle. The method of producing an ?-alumina particle comprises steps of: (1) heating a mixture containing an amorphous alumina and a pyrolyzable salt at temperature of not less than the temperature at which the pyrolyzable salt is decomposed, and less than the temperature at which the amorphous alumina transforms to ?-alumina; and (2) calcining the resultant under a partial pressure of water vapor of about 600 Pa or less.
    Type: Application
    Filed: March 10, 2005
    Publication date: September 15, 2005
    Inventors: Hajime Maki, Yoshiaki Takeuchi
  • Method for producing alpha-alumina powder
    Publication number: 20050008565
    Abstract: A method for producing ?-alumina powder is described. The method comprises the steps of removing water from a compound containing the following (1), (2), (3) and (4), and calcining the results: (1) ?-alumina precursor, (2) seed crystal, (3) water, (4) nitrate ion in an amount of from 2.8 to 3.3 mol per mol of aluminum (Al) contained in the ?-alumina precursor and the seed crystal.
    Type: Application
    Filed: May 17, 2004
    Publication date: January 13, 2005
    Inventors: Hajime Maki, Yoshiaki Takeuchi, Kazuhisa Kajihara
  • Method for producing alpha -alumina powder
    Publication number: 20040184984
    Abstract: A method for producing an &agr;-alumina powder is described. The method for producing an &agr;-alumina powder comprises a step of calcining an aluminum salt in the presence of a seed crystal at 600-890° C.
    Type: Application
    Filed: February 24, 2004
    Publication date: September 23, 2004
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Hajime Maki, Yoshiaki Takeuchi
  • Method for producing alpha-alumina particulate
    Publication number: 20040186005
    Abstract: A method for producing an &agr;-alumina particulate is described.
    Type: Application
    Filed: February 25, 2004
    Publication date: September 23, 2004
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Hajime Maki, Yoshiaki Takeuchi