Patents by Inventor Arinobu Hamada

Arinobu Hamada 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).

  • Aluminum alloys having improved mechanical properties and workability and method of making same
    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