Patents by Inventor Kenkichi Matsunaga

Kenkichi Matsunaga 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).

  • Alloys for exhaust valve
    Patent number: 4871512
    Abstract: An alloy for use in an exhaust valve of an automotive vehicle is disclosed, which consists of C: 0.01-0.15%, Si.ltoreq.2.0%, Mn.ltoreq.0.5%; Cr: 15-25%, Mo: 0.4-3.1% and W: 0.2-3.8% so that (Mo+1/2W) is 0.5 to 5.0%, Nb+Ta: 0.3-3.0%, Ti: 1.5-3.5%, Al: 0.5-2.5%, B: 0.001-0.02%, Fe.ltoreq.5% and the balance of Ni or Ni+Co.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: October 3, 1989
    Assignees: Daido Tokushuko K.K., Honda Giken Kogyo K.K.
    Inventors: Yoshiaki Takagi, Susumu Isobe, Kenkichi Matsunaga
  • Heat-resisting steels
    Patent number: 4650645
    Abstract: A heat-resisting steel suitable for use in valve parts of internal combustion engine is disclosed, which consists essentially by weight percentage of 0.3-0.5% of C, more than 1.0% to 2.5% of Si, 0.1-2.0% of Mn, 0.5-7.0% of Cr, 0.3-2.0% of Mo and 0.1-1.0% of V as basic ingredients, at least one of 0.3-2.0% of Cu and 0.001-0.05% of REM as sub-ingredients and if necessary, at least one of 0.1 to less than 2.0% of Ni, 0.1-1.5% of W and 0.03-1.0% of Nb+Ta, and the balance of Fe and inevitable impurities.
    Type: Grant
    Filed: December 3, 1984
    Date of Patent: March 17, 1987
    Assignee: Daido Steel Company Limited
    Inventors: Tetsuo Kato, Susumu Isobe, Kenkichi Matsunaga
  • Alloys for exhaust valves
    Patent number: 4631169
    Abstract: An alloy for use in exhaust valves is disclosed, which consists by weight percentage of 0.01.about.0.15% of C, not more than 2.0% of Si, not more than 2.5% of Mn, 53.about.65% of Ni, 15.about.25% of Cr, 0.3.about.3.0% of Nb, 2.0.about.3.5% of Ti, 0.2.about.1.5% of Al, 0.0010.about.0.020% of B, and the remainder being substantially Fe. If necessary, the alloy further contains at least one element selected from 0.001.about.0.030% of Mg, 0.001.about.0.030% of Ca and 0.001.about.0.050% of REM.
    Type: Grant
    Filed: April 2, 1985
    Date of Patent: December 23, 1986
    Assignees: Daido Tokushuko Kabushiki Kaisha, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Susumu Isobe, Kenkichi Matsunaga, Yoshiaki Takagi, Norikatsu Sato