Patents by Inventor Howard C. Fiedler

Howard C. Fiedler 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).

  • Method of producing silicon-iron sheet material with annealing atmospheres of nitrogen and hydrogen
    Patent number: 4338144
    Abstract: Silicon-iron sheet products having good magnetic properties can be produced from low nitrogen alloy sheet material by heating in a nitrogen-bearing hydrogen atmosphere to a temperature sufficient to effect secondary recrystallization and thereafter heating to a higher temperature in a hydrogen atmosphere to effect removal of residual carbon, nitrogen, and sulfur.
    Type: Grant
    Filed: January 12, 1981
    Date of Patent: July 6, 1982
    Assignee: General Electric Company
    Inventor: Howard C. Fiedler
  • Method of producing silicon-iron sheet material, and product
    Patent number: 4177091
    Abstract: The magnetic properties of silicon-iron containing tin and very low sulfur are improved without impairing weldability by adding from 0.002 to 0.010 percent selenium to the melt.
    Type: Grant
    Filed: August 16, 1978
    Date of Patent: December 4, 1979
    Assignee: General Electric Company
    Inventor: Howard C. Fiedler
  • Product and method of producing silicon-iron sheet material employing antimony
    Patent number: 4174235
    Abstract: The presence of antimony improves the magnetic properties of silicon-iron. Weld brittleness is reduced in addition to improving the magnetic properties by both adding antimony and lowering the sulfur content.
    Type: Grant
    Filed: January 9, 1978
    Date of Patent: November 13, 1979
    Assignee: General Electric Company
    Inventor: Howard C. Fiedler
  • Method of producing silicon-iron sheet material with boron addition, and product
    Patent number: 4173502
    Abstract: Addition of as little as six parts per million boron to the magnesia final anneal coating on silicon-iron strip containing only about 1.5 ppm insures secondary recrystallization while the addition of 70 ppm boron to the coating on a strip containing 10 to 15 ppm boron results in substantial reduction in losses without affecting permeability of the final product when the nitrogen content of the alloy is in the 80 to 90 ppm range.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: November 6, 1979
    Assignee: General Electric Company
    Inventor: Howard C. Fiedler
  • Method of producing silicon-iron sheet materal, and product
    Patent number: 4123299
    Abstract: The magnetic properties of silicon-iron are improved by adding tin, and by both adding tin and lowering the sulfur content the weld brittleness is reduced in addition to improving the magnetic properties.
    Type: Grant
    Filed: September 29, 1978
    Date of Patent: October 31, 1978
    Assignee: General Electric Company
    Inventors: Howard C. Fiedler, Joseph T. Cohen
  • Method of producing silicon-iron sheet material with copper as a partial substitute for sulfur, and product
    Patent number: 4113529
    Abstract: Weld brittleness of silicon-iron can be reduced without loss of excellent magnetic properties by limiting the sulfur content to not more than 0.018 percent and using copper as a partial substitute for sulfur as a normal grain growth inhibitor during the final texture-developing anneal.
    Type: Grant
    Filed: September 29, 1977
    Date of Patent: September 12, 1978
    Assignee: General Electric Company
    Inventor: Howard C. Fiedler
  • Method of producing oriented silicon-iron sheet material with boron and nitrogen additions
    Patent number: 3957546
    Abstract: Silicon-iron sheet products of excellent magnetic properties can be produced by providing a hot-rolled band containing a small but critical amount of boron in critical proportion to the nitrogen content of the metal in which the manganese to sulfur ratio is less than 1.8, cold rolling the band directly to final thickness, and then heat treating the cold-rolled product to cause secondary recrystallization.
    Type: Grant
    Filed: June 9, 1975
    Date of Patent: May 18, 1976
    Assignee: General Electric Company
    Inventor: Howard C. Fiedler