Patents by Inventor Yasutaka Nawata

Yasutaka Nawata 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: 5358794
    Abstract: In order to improve the sharpness, after painting, of a steel strip and, at the same time, improve the press moldability of the steel strip, the steel strip of the present invention is characterized by having a plurality of small recessed portions transferred by means of a rolling dull roll having a protrusion composed mainly of Cr and homogeneously provided on the surface of the roll; the recessed portion having a configuration satisfying requirements of a diameter, d, of 50 to 500 .mu.m, a depth, h, of the recessed portion of 2 to 40 .mu.m and a total volume of recessed portions per mm.sup.2 of the surface of the steel strip of 0.10.times.10.sup.6 .mu.m.sup.3 or more, the center line distance, P.sub.1, between recessed portions adjacent to each other in the direction of rolling being in the range of from 1.0 d to 4.0 d, the center line distance, P.sub.2, between rows in the direction of rolling being in the range of from 1.0 d to 4.0 d.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: October 25, 1994
    Assignee: Nippon Steel Corporation
    Inventors: Takaharu Kawamoto, Yasutaka Nawata, Yasuo Hamamoto, Hiromi Toyota, Shuichi Shiozawa