Patents by Inventor Shigehisa Naka

Shigehisa Naka 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).

  • Titanium aluminide which can be used at high temperature
    Patent number: 6176949
    Abstract: Alloy of the Ti2AlX type composed at least essentially of the elements Ti, Al, Nb, Ta and Mo and in which the relative amounts as atoms of said elements and of silicon are substantially within the following intervals: Al: 20 to 25% Nb: 10 to 15% Ta: 1.4 to 5%   Mo: 2 to 4% Ti: remainder to 100%. This alloy exhibits properties superior to those of the known titanium alloys.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: January 23, 2001
    Assignee: Onera (Office National D'Etudes et de Recherches Aerospatiales)
    Inventors: Marc Thomas, Michel Marty, Shigehisa Naka
  • Intermetallic alloy based on titanium aluminide for casting
    Patent number: 5846345
    Abstract: In an alloy having a Ti/Al ratio close to 52/48, good castability, by virtue of initial solidification in the .beta. phase, together with a sufficiently low density and a good oxidation resistance are obtained by introducing approximately 2 atom. % of rhenium and/or tungsten. These alloys can be used especially for the production of aeronautical turbomachine components.
    Type: Grant
    Filed: March 26, 1996
    Date of Patent: December 8, 1998
    Assignee: Office National D'Etudes et de Recherches Aerospatiales
    Inventors: Shigehisa Naka, Marc Thomas, Agnes Bachelier-Locq, Tasadduq Khan
  • Niobium or tantalum based high specific strength inter metallic compounds and alloys
    Patent number: 5486242
    Abstract: Tantalum-based and niobium-based alloys made up entirely of a crystalline medium exhibiting a substantially continuous centered cubic structure, comprising an intermetallic compound of formula Ti.sub.2 AlMo, and having the following compositions on an atomic basis:______________________________________ Ta + Cr 20 to 35% Cr 0 to 5% Ti 20 to 40% Al 8 to 20% Mo 8 to 20%, ______________________________________wherein the concentration of Ta is less than 30%; and ______________________________________ Nb + Cr 20 to 60% Cr 0 to 5% Ti 20 to 40% Al 8 to 20% Mo 8 to 20%. ______________________________________ .
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: January 23, 1996
    Assignee: Office National d'Etudes et de Recherches Aerospatiales
    Inventors: Shigehisa Naka, Tasadduq Khan, Andre Walder, Michel Marty, Christophe Delaunay, Pierre Thevenin