Patents by Inventor Chung S. Lee

Chung S. Lee 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).

  • Grain oriented electrical steel sheet having superior magnetic properties, and manufacturing process thereof
    Patent number: 5401332
    Abstract: A grain oriented electrical steel having superior magnetic properties and for use in transformers and electrical generators, and a manufacturing process thereof are disclosed. Cu and P are mixedly added in the melting stage of a silicon steel containing MnS and AlN as grain growth inhibitors, and in this way, the magnetic properties are improved. The chemical composition of the steel sheet of the present invention are: 2.50-4.00% of Si, 0.03-0.15% of Mn, 0.030-0.300% of Cu, and 0.020-0.200% of P, the balance being Fe, all in weight %. The grain oriented electrical steel sheet of the present invention shows a low iron loss and a high magnetic flux density, and is cold-rolled to a thickness range of 0.15-0.27 mm.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: March 28, 1995
    Assignees: Pohang Iron & Steel Co., Ltd., Research Institute of Industrial Science & Technology
    Inventors: Chung S. Lee, Jong S. Wo
  • Vase or similar article
    Patent number: D299445
    Type: Grant
    Filed: November 9, 1987
    Date of Patent: January 17, 1989
    Assignee: Three-Ply Company, Ltd.
    Inventor: Chung S. Lee