Patents by Inventor Ryo Maruta

Ryo Maruta 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).

  • High-strength steel sheet having excellent formality and resistance to softening of the heat affected zone after welding
    Patent number: 6428631
    Abstract: A high-strength steel sheet having excellent fatigue property, excellent formability and resistance to softening of the heat affected zone after welding, comprising: 0.01 to 0.15 mass % of C, 0.005 to 1.0 mass % of Si, 0.1 to 2.2 mass % of Mn, 0.001 to 0.06 mass % of P, 0.001 to 0.01 mass % of S, 0.0005 to 0.01 mass % of N, 0.001 to 0.1 mass % of Al, 0.005 to 0.05 mass % of Nb, 0.05 to 0.5 mass % of Mo, when necessary, 0.001 to 0.02 mass % of Ti, 0.2 to 2.0 mass % of Cu and 0.05 to 2.0 mass % of Ni, and the remainder of Fe, wherein the components satisfy the following expression (A). 0.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: August 6, 2002
    Assignee: Nippon Steel Corporation
    Inventors: Toshimasa Tomokiyo, Hirokazu Taniguchi, Ryo Maruta