Patents by Inventor Takehisa Mizunuma

Takehisa Mizunuma 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).

  • Process for producing thin strip of Cr-stainless steel having high toughness
    Patent number: 5492575
    Abstract: To produce a thin strip having a high cast strip toughness from a thin cast strip of a Cr-stainless steel containing Nb, Ti, and Al in an amount of 0.05% or more, a process includes the steps of: casting a thin cast strip of a Cr-stainless steel having a thickness of 10 mm or less, the steel containing 13-25 wt % of Cr, 0.05-1 wt % of one or more of Nb, Ti, Al and V in terms of a total amount, 0.03 wt % or less of C, 0.03 wt % or less of N, and 0.3-3.0 wt % of Mo in accordance with need, and having a .gamma.p value of 0% or less; hot-rolling the thin cast strip in a temperature range of from 1150.degree. to 950.degree. C. at a reduction in thickness of 5 to 50% to form a thin strip; either slowly cooling the thin strip at a rate of 20.degree. C./sec or less or holding the thin strip for 5 sec or more, in a temperature range of from 1150.degree. to 950.degree. C.; and then coiling the thin strip at a temperature lower than 700.degree. C..gamma.p(%)=420C+470N+23Ni+9Cu+7Mn-11.5Cr-11.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: February 20, 1996
    Assignee: Nippon Steel Corporation
    Inventors: Shinichi Teraoka, Takehisa Mizunuma, Takanori Nakazawa, Yuichi Satoh
  • Metal sheet that selectively absorbs solar radiation
    Patent number: 4579606
    Abstract: In order to obtain a film having a low electric resistance and a good selective absorption property of solar radiation, good rust proofing and good weldability, a stainless steel is dipped in a chemical conversion bath, in which sodium bichromate or potassium bichromate is mixed with sulfuric acid at a predetermined proportion to one another, in accordance with the method of the present invention. The product film of the present invention comprises metal oxides or metal hydroxides with metal (Fe+Cr) finely dispersed therein.
    Type: Grant
    Filed: October 3, 1984
    Date of Patent: April 1, 1986
    Assignee: Nippon Steel Corporation
    Inventors: Takehisa Mizunuma, Seizaburo Abe, Jiro Ohno, Hisashi Kobayashi
  • Method for producing a selective absorption sheet of a solar radiation
    Patent number: 4491487
    Abstract: In order to obtain a film having a low electric resistance and a good selective absorption property of solar radiation, good rust proofing and good weldability, a stainless steel is dipped in a chemical conversion bath, in which sodium bichromate or potassium bichromate is mixed with sulfuric acid at a predetermined proportion to one another, in accordance with the method of the present invention. The product film of the present invention comprises metal oxides or metal hydroxides with metal (Fe+Cr) finely dispersed therein.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: January 1, 1985
    Assignee: Nippon Steel Corporation
    Inventors: Takehisa Mizunuma, Seizaburo Abe, Jiro Ohno, Hisashi Kobayashi