Patents by Inventor Kiwamu Okuma

Kiwamu Okuma 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).

  • Process and apparatus for forming glass filaments
    Patent number: 5154746
    Abstract: A process for forming glass filaments by utilizing centrifugal force, in which compressed gas is injected from a position near an interior of a flame port frame of a fiberizing burner toward a throat portion of a discharge port of the burner at an acute angle relative to the direction of discharge of a flame stream from the discharge port, so that the compressed gas is mixed with combustion exhaust gas at an inlet portion of the throat portion, and the mixed gas is injected from the discharge port of the burner in a direction generally parallel to the direction of the generatrix of the outer peripheral surface of the peripheral wall, thereby forming primary filaments into fine secondary filaments.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: October 13, 1992
    Assignees: Nitto Boseiki Co., Ltd., Paramount Glass Mfg. Co., Ltd.
    Inventors: Kiwamu Okuma, Keiji Otaki, Mitsuji Yoda, Yukiyoshi Shinobu
  • Casting alloy resistant to corrosion and wear at elevated temperatures
    Patent number: 4532105
    Abstract: A high temperature corrosion-resistant and wear-resistant casting alloy used for preparing rotatory cylinder of glass fibers spinning, which consists essentially of 0.08 to 0.8% of C, 15 to 35% of Cr, 1 to 5.5% of W, 0.10 to 0.25% of Ti, 0.10 to 0.25% of Zr, about 1% of Nb, and the remainder constituted by Ni and impurities unavoidably carried into the alloy.
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: July 30, 1985
    Assignees: Shinokoku Steel Corporation, Nitto Boseki Co., Ltd., Paramount Glass Mfg., Co., Ltd.
    Inventors: Saburo Kunioka, Kiwamu Okuma, Tsunehiro Haga, Hatsuo Kawaguti
  • Glass fiber forming unit
    Patent number: 4392878
    Abstract: In a glass fiber forming unit including a hollow-cylinder-shaped rotating spinner having (a) a bottom, (b) a surrounding wall with a number of molten glass projecting orifices, and (c) an upper annular flange extending inwardly from the upper edge of the surrounding wall; and an attenuating blast burner with jet flame orifices for attenuating primary filaments formed at the tips of transition cones of molten glass projecting from the rotating spinner into secondary filaments, the improvement comprising the jet flame orifices in the attenuating blast burner being so positioned that, for each jet flame from each jet flame orifice, only an outer cone of flame is in contact with the lower portion of the outer surface of the surrounding wall of the hollow-cylinder-shaped rotating spinner where the speed of the outer cone of flame is such as to not break the transition cone of molten glass, and a heating burner disposed inside the upper annular flange of the hollow-cylinder-shaped rotating spinner for jetting a fla
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: July 12, 1983
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Kiwamu Okuma, Tsunehiro Haga, Masao Kizara, Keiji Otaki, Ayahiro Hirai