Patents by Inventor Tateo Yuchi

Tateo Yuchi 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).

  • Lead material for ceramic package IC
    Patent number: 4687633
    Abstract: A lead material for ceramic package ICs which comprises Ni 1.0-5.0 wt %, Co 0.2-1.0 wt %, Si 0.2-1.5 wt %, Zn 0.1-5.0 wt %, Cr 0.001-0.1 wt %, and Mn 0.02-1.0 wt %, with the remainder being Cu and inevitable impurities. It does not cause cracking to the ceramic substrate in the cooling step after silver soldering at 800.degree. to 950.degree. C., even though its coefficient of thermal expansion differs from that of ceramics. Moreover, it retains its high strength and conductivity after brazing.
    Type: Grant
    Filed: January 7, 1986
    Date of Patent: August 18, 1987
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Motohisa Miyafuji, Tateo Yuchi, Riichi Tsuno