Patents by Inventor Ryota Mitamura

Ryota Mitamura 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).

  • Patent number: 4664175
    Abstract: In continuous casting of a non-ferrous metal melt by a gas-pressure impartation method, the cast skin of a large size ingot is usually impaired by the chilling effect of a mold, and it is difficult to stably produce a large size ingot. This difficulty is overcome by controlling the quantity of gas inflow in accordance with the quantity of the light emitted from a light source provided below a mold and laterally to an ingot, which light reaches a separate chamber for gas-pressure impartation.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: May 12, 1987
    Assignee: Showa Aluminum Industries K. K.
    Inventors: Shigeru Yanagimoto, Ryota Mitamura
  • Patent number: 4157728
    Abstract: A direct chill casting of metals, particularly hot top casting of aluminum and its alloy, is improved by applying a gas pressure to the metals from directly below the overhang of a feed reservoir for receiving a melt to be cast.The direct chill casting is further improved by supplying a lubricating oil from a slit for conveying the gas to the inner wall of the mold.By using the process and the apparatus according to the invention, ingots having excellent smooth surfaces and reduced segregation can be reliably produced with a reduction in the amount of the lubricating oil used.
    Type: Grant
    Filed: July 29, 1977
    Date of Patent: June 12, 1979
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Ryota Mitamura, Tadanao Itoh
  • Patent number: 4077810
    Abstract: An aluminum alloy consisting essentially of 8 to 15% by weight of silicon, 0.05 to 0.7% by weight of magnesium, 1 to 4.5% by weight of copper, the balance being aluminum, wherein a silicon crystal in eutectic structure crystallized out in an aluminum matrix has a mean grain size not larger than 5 microns and intermetallic compounds of magnesium and copper are finely precipitated in the matrix as age-hardening elements for the matrix, and the alloy has at least 40 kg/mm.sup.2 tensile strength and at least 10% elongation, good antiwearing and excellent workability.The disclosure is also concerned with a method of making the above-mentioned aluminum alloy.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: March 7, 1978
    Assignees: Hitachi, Ltd., Showa Denko K.K.
    Inventors: Yasushi Ohuchi, Takeo Tamamura, Naotatsu Asahi, Makoto Nakayama, Hisanobu Kanamaru, Arinobu Hamada, Yasuhiro Takahashi, Kozo Tabata, Ryota Mitamura