Patents by Inventor Grigory Lyudkovsky

Grigory Lyudkovsky 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).

  • Low loss electrical steel strip
    Patent number: 4772341
    Abstract: A cold-rolled steel strip having a combined silicon and aluminum content no greater than about 1.5 wt. % is subjected to processing including a continuous decarburization anneal after temper rolling. The strip is stamped into motor core laminations and stress relief annealed. The resulting lamination has magnetic properties comparable to a lamination having a much higher silicon and silicon plus aluminum content.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: September 20, 1988
    Assignee: Inland Steel Company
    Inventors: Prabhat K. Rastogi, Grigory Lyudkovsky
  • Low loss electrical steel strip and method for producing same
    Patent number: 4601766
    Abstract: A cold-rolled steel strip having a combined silicon and aluminum content no greater than about 1.5 wt. % is subjected to processing including a continuous decarburization anneal after temper rolling. The strip is stamped into motor core laminations and stress relief annealed. The resulting lamination has magnetic properties comparable to a lamination having a much higher silicon and silicon plus aluminum content.
    Type: Grant
    Filed: January 25, 1985
    Date of Patent: July 22, 1986
    Assignee: Inland Steel Company
    Inventors: Prabhat K. Rastogi, Grigory Lyudkovsky
  • Steel with antimony addition
    Patent number: 4483723
    Abstract: A cold rolled steel strip contains alloying elements, such as Al and Si, which have an affinity for oxygen greater than that of iron. During annealing of the strip, these alloying elements undergo oxidation to form an internal oxidation layer adjacent the surface of the strip. Formation of such an internal oxidation layer in the cold rolled steel strip is impeded by adding antimony to the steel, and depletion of the antimony prior to annealing the cold rolled strip is minimized by minimizing annealing and pickling of the strip before the strip attains substantially its final thickness.
    Type: Grant
    Filed: February 23, 1983
    Date of Patent: November 20, 1984
    Assignee: Inland Steel Company
    Inventor: Grigory Lyudkovsky
  • Method for suppressing internal oxidation in steel with antimony addition
    Patent number: 4421574
    Abstract: A cold rolled steel strip contains alloying elements, such as Al and Si, which have an affinity for oxygen greater than that of iron. During annealing of the strip, these alloying elements undergo oxidation to form an internal oxidation layer adjacent the surface of the strip. Formation of such an internal oxidation layer in the cold rolled steel strip is impeded by adding antimony to the steel, and depletion of the antimony prior to annealing the cold rolled strip is minimized by minimizing annealing and pickling of the strip before the strip attains substantially its final thickness.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: December 20, 1983
    Assignee: Inland Steel Company
    Inventor: Grigory Lyudkovsky