Patents by Inventor Hirotaka Takushima

Hirotaka Takushima 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).

  • Publication number: 20030131687
    Abstract: A method for preparing a highly crystallized metal powder, comprising: supplying at least one heat-decomposable metal compound powder into a reaction vessel using a carrier gas; and forming a metal powder by heating the metal compound powder in a state in which the metal compound powder is dispersed in a gas phase at a concentration of no more than 10 g/liter, at a temperature that is over the decomposition temperature of the metal compound powder and at least (Tm−200)° C. when the melting point of the metal contained in the metal compound powder is Tm° C. The method provides a high-purity, high-density, highly dispersible, fine, highly crystallized metal powder consisting of spherical particles of uniform size, which is suited to use in thick film pastes, and particularly conductor pastes and the like used in the preparation of multilayer ceramic electronic parts.
    Type: Application
    Filed: January 14, 2003
    Publication date: July 17, 2003
    Applicant: Shoei Chemical Inc.
    Inventors: Yuji Akimoto, Kazuro Nagashima, Hiroshi Yoshida, Hirotaka Takushima, Masayuki Maekawa
  • Patent number: 6530972
    Abstract: A method for preparing a highly crystallized metal powder, involving the steps of: supplying at least one heat-decomposable metal compound powder into a reaction vessel using a carrier gas; and forming a metal powder by heating the metal compound powder in a state in which the metal compound powder is dispersed in a gas phase at a concentration of no more than 10 g/liter, at a temperature that is over the decomposition temperature of the metal compound powder and at least (Tm −200)° C. when the melting point of the metal contained in the metal compound powder is Tm° C. The method provides a high-purity, high-density, highly dispersible, fine, highly crystallized metal powder consisting of spherical particles of uniform size, which is suitable for use in thick film pastes, and particularly conductor pastes and the like used in the preparation of multilayer ceramic electronic parts.
    Type: Grant
    Filed: April 17, 2001
    Date of Patent: March 11, 2003
    Assignee: Shoei Chemical Inc.
    Inventors: Yuji Akimoto, Kazuro Nagashima, Hiroshi Yoshida, Hirotaka Takushima, Masayuki Maekawa
  • Publication number: 20020000137
    Abstract: A method for preparing a highly crystallized metal powder, comprising: supplying at least one heat-decomposable metal compound powder into a reaction vessel using a carrier gas; and forming a metal powder by heating the metal compound powder in a state in which the metal compound powder is dispersed in a gas phase at a concentration of no more than 10 g/liter, at a temperature that is over the decomposition temperature of the metal compound powder and at least (Tm −200)° C. when the melting point of the metal contained in the metal compound powder is Tm° C. The method provides a high-purity, high-density, highly dispersible, fine, highly crystallized metal powder consisting of spherical particles of uniform size, which is suited to use in thick film pastes, and particularly conductor pastes and the like used in the preparation of multilayer ceramic electronic parts.
    Type: Application
    Filed: April 17, 2001
    Publication date: January 3, 2002
    Inventors: Yuji Akimoto, Kazuro Nagashima, Hiroshi Yoshida, Hirotaka Takushima, Masayuki Maekawa