Patents by Inventor Masaaki Hama

Masaaki Hama 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 .alpha.-form silicon nitride fine powders
    Patent number: 4590053
    Abstract: A method for producing a high-grade fine powder of .alpha.-form silicon nitride (.alpha.-Si.sub.3 N.sub.4) for use as sintered bodies excellent in heat-stability and mechanical strength which comprises heat-treating, in an atmosphere containing nitrogen, a mixture prepared by adding additive:a mixture of at least one of Mg, Ca, and compounds thereof with 0.01-1 part by weight of silicon nitride powder,in a total amount of 0.001-0.1 part by weight calculated in terms of elemental weight(s) of Mg or/and Ca, and 1 part or less by weight of silicon nitride powder, to 1 part by weight of silicon oxide powder and 0.4-4 parts by weight of carbon powder.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: May 20, 1986
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Tadanori Hashimoto, Kazuhiko Nakano, Masaaki Hama, Norio Matsuda
  • Adhesive composition
    Patent number: 4144113
    Abstract: An adhesive composition comprising (1) a polyolefin having therein at least one repeating unit containing a carbonyl group and (2) at least one of calcium chloride, magnesium chloride or a mixture thereof.
    Type: Grant
    Filed: June 17, 1977
    Date of Patent: March 13, 1979
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Atsuo Mori, Taisuke Okita, Shuji Kitamura, Kozo Kotani, Masaaki Hama