Patents by Inventor Kyu-Seung Choi

Kyu-Seung Choi 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).

  • Coating composition, and method for manufacturing high silicon electrical steel sheet using thereof
    Patent number: 7435304
    Abstract: There are provided a coating composition for siliconizing, and a method for manufacturing a high silicon electrical steel sheet using the same. The coating composition includes: a Fe—Si-based composite compound sintered powder having a grain size of ?325 mesh and containing 20-70% silicon by weight; and a colloidal silica solution containing 15-30 part by weight of silica solid matter with respect to 100 part by weight of the sintered powder.
    Type: Grant
    Filed: November 11, 2003
    Date of Patent: October 14, 2008
    Assignee: POSCO
    Inventors: Kyu-Seung Choi, Jong-Soo Woo
  • Method for manufacturing high silicon grain-oriented electrical steel sheet with superior core loss property
    Patent number: 7282102
    Abstract: A method for manufacturing a high silicon grain-oriented electrical steel sheet. In a method for manufacturing a high silicon grain-oriented electrical steel sheet, comprising the steps of: reheating and hot-rolling a steel slab to produce a hot-rolled steel sheet; annealing the hot-rolled sheet and cold rolling the annealed steel sheet so as to adjust a thickness of the steel sheet; decarburization annealing the cold rolled steel sheet; and finish-annealing the decarburization annealed steel sheet for secondary recrystallization, the improved method further comprising the step of: coating a powder coating agent for siliconization on a surface of the decarburization annealed steel sheet in a slurry state, the powder coating agent including 100 part by weight of MgO powder and 0.
    Type: Grant
    Filed: November 11, 2003
    Date of Patent: October 16, 2007
    Assignee: Posco
    Inventors: Kyu-Seung Choi, Jong-Soo Woo, Jae-Kwan Kim
  • Method for manufacturing high silicon grain-oriented electrical steel sheet with superior core loss property
    Publication number: 20050247374
    Abstract: A method for manufacturing a high silicon grain-oriented electrical steel sheet. In a method for manufacturing a high silicon grain-oriented electrical steel sheet, comprising the steps of: reheating and hot-rolling a steel slab to produce a hot-rolled steel sheet; annealing the hot-rolled sheet and cold rolling the annealed steel sheet so as to adjust a thickness of the steel sheet; decarburization annealing the cold rolled steel sheet; and finish-annealing the decarburization annealed steel sheet for secondary recrystallization, the improved method further comprising the step of: coating a powder coating agent for siliconization on a surface of the decarburization annealed steel sheet in a slurry state, the powder coating agent including 100 part by weight of MgO powder and 0.
    Type: Application
    Filed: November 11, 2003
    Publication date: November 10, 2005
    Inventors: Kyu-Seung Choi, Jong-Soo Woo, Jae-Kwan Kim
  • Coating composition, and method for manufacturing high silicon electrical steel sheet using thereof
    Publication number: 20050217762
    Abstract: There are provided a coating composition for siliconizing, and a method for manufacturing a high silicon electrical steel sheet using the same. The coating composition includes: a Fe—Si-based composite compound sintered powder having a grain size of ?325 mesh and containing 20-70% silicon by weight; and a colloidal silica solution containing 15 -30 part by weight of silica solid matter with respect to 100 part by weight of the sintered powder.
    Type: Application
    Filed: November 11, 2003
    Publication date: October 6, 2005
    Inventors: Kyu-Seung Choi, Jong-Soo Woo