Patents by Inventor Takeo Iga

Takeo Iga 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 production of needlelike crystalline particles
    Patent number: 5286687
    Abstract: Needlelike single crystal particles of .alpha.- alumina, .theta.-alumina, mullite, sillimanite, etc. are produced by adding a silicon-containing substance to needlelike alumina precursor particles and heating the resultant product of addition.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: February 15, 1994
    Assignees: Agency of Industrial Science and Technology, Ministry of International Trade & Industry
    Inventors: Yoshio Murase, Takeo Iga
  • Method for manufacture of high-strength sintered article of substances having .beta.-silicon nitride type crystal structure
    Patent number: 4365022
    Abstract: A high-strength sintered article of chemical substances having the .beta.-silicon nitride type crystal structure is produced by blending 50 to 99.9 weight percent of a .beta.-silicon nitride and/or .beta.'-Sialon and 50 to 0.1 weight percent of a mixture, as a sintering aid, consisting of BeO, Ga.sub.2 O.sub.3, and Al.sub.2 O.sub.3 in respective amounts such as to have a Ga.sub.2 O.sub.3 /BeO ratio in the range of from 2.8 to 9.4, an Al.sub.2 O.sub.3 /BeO ratio in the range of from 0.0 to 2.6, and an Al.sub.2 O.sub.3 /Ga.sub.2 O.sub.3 ratio in the range of from 0.0 to 1.1, all ratios being ratios by weight and sintering the resultant blend.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: December 21, 1982
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Hideyo Tabata, Yoshitaka Kuwahara, Michihide Machida, Shyoichi Kume, Takeo Iga, Kazuo Saitoh, Shinji Tomura
  • Method for manufacture of sintered alumina from ammonium aluminum carbonate hydroxide
    Patent number: 4053579
    Abstract: Aluminum carbonate hydroxide ammonium, a new compound, is produced by causing a solution of ammonium hydrogencarbonate to be reacted upon by a soluble aluminum salt. .alpha.-Alumina is obtained by thermal decomposition of this ammonium aluminum carbonate hydroxide. By sintering said .alpha.-alumina, there is obtained sintered .alpha.-alumina.
    Type: Grant
    Filed: October 17, 1975
    Date of Patent: October 11, 1977
    Assignee: Agency of Industrial Science & Technology
    Inventors: Shuzo Kato, Takeo Iga, Shogo Hatano, Yuichi Isawa