Patents by Inventor Takayuki Tsukahara

Takayuki Tsukahara 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).

  • Low thermal expansion cast alloy
    Patent number: 4832908
    Abstract: A novel low thermal expansion cast alloy is provided. The alloy consists of, by percents by weight, 0.02 to 0.25% of C, 30.5 to 33.3% of Ni, 4.0 to 6.0% of Co, 0.005 to 0.70% of Mn, 0.005-0.50% of Si and the balance substantially of Fe, with the proviso that % C.gtoreq.3.0285-0.0936 x % Ni (% C and % Ni are weight % of C and Ni). By such composition, micro-segregation of Ni can be reduced and the Ni content range showing the low thermal expansion coefficient can be broadened to an extent of substantially enabling mass production by a casting process in place of the conventional forging or rolling process. The average thermal expansion coefficient at the temperature range from - 50 to 120.degree. C. of the cast alloy is not more than 1.5.times.10.sup.-6 /.degree.C.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: May 23, 1989
    Assignees: NEC Corporation, Hitachi Metals Precision Ltd.
    Inventors: Katsuhisa Ishikawa, Ryoji Yamamoto, Takayuki Tsukahara