Patents by Inventor Prabhat K. Rastogi

Prabhat K. Rastogi 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).

  • Steel spring and method for producing same
    Patent number: 5368656
    Abstract: A hot rolled steel bar is subjected to controlled hot roll finishing and cooling conditions which, together with the composition of the steel and controlled subsequent heat treating and quenching conditions, enable the formation of a steel spring having both relatively high hardness and high toughness.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: November 29, 1994
    Assignee: Inland Steel Company
    Inventors: William E. Heitmann, Prabhat K. Rastogi, Thomas G. Oakwood
  • Steel bar and method for producing same
    Patent number: 5282906
    Abstract: A hot rolled steel bar is subjected to controlled hot roll finishing and cooling conditions which, together with the composition of the steel and controlled subsequent heat treating and quenching conditions, enable the formation of a steel spring having both relatively high hardness and high toughness.
    Type: Grant
    Filed: January 16, 1992
    Date of Patent: February 1, 1994
    Assignee: Inland Steel Company
    Inventors: William E. Heitmann, Prabhat K. Rastogi, Thomas G. Oakwood
  • 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
  • Low silicon steel electrical lamination strip
    Patent number: 4545827
    Abstract: The chemical composition and processing of a cold rolled steel strip are controlled. Laminations for the core of an electric motor are stamped from the strip and decarburized to produce a lamination having a 1.5 T (15 kG) average core loss value less than about 5.70 W/kg (2.60 W/lb.) and average peak permeability substantially more than about 2000 G/Oe. for a sample thickness of about 0.018 in. (0.46 mm.).
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: October 8, 1985
    Assignee: Inland Steel Company
    Inventor: Prabhat K. Rastogi
  • Method for producing low silicon steel electrical lamination strip
    Patent number: 4394192
    Abstract: The chemical composition and processing of a cold rolled steel strip are controlled. Laminations for the core of an electric motor are stamped from the strip and decarburized to produce a lamination having a 1.5 T (15 kG) average core loss value less than about 5.70 W/kg (2.60 W/lb.) and average peak permeability substantially more than about 2000 G/Oe. for a sample thickness of about 0.018 in. (0.46 mm.).
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: July 19, 1983
    Assignee: Inland Steel Company
    Inventor: Prabhat K. Rastogi