Patents by Inventor Hisanao Nakahara

Hisanao Nakahara 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).

  • Grain oriented electromagnetic steel sheets having a very low iron loss and method of producing the same
    Patent number: 4963197
    Abstract: A grain oriented electromagnetic steel sheet having a very low iron loss is obtained by subjecting a surface of base metal in the sheet after finish annealing to a particular mechanical polishing and has a surface roughness having a center-line average roughness of not more than 0.3 .mu.m after the polishing and the number of abrasive grains embedded in a layer just beneath polished surface of not more than 20,000 grains/cm.sup.2.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: October 16, 1990
    Assignee: Kawasaki Steel Corp.
    Inventors: Ujihiro Nishiike, Yasuhiro Kobayashi, Hirotake Ishitobi, Shigeko Sujita, Norio Takahashi, Hisanao Nakahara, Yukio Inokuti
  • Grain oriented electromagnetic steel sheets having a very low iron loss
    Patent number: 4906530
    Abstract: A grain oriented electromagnetic steel sheet having a very low iron loss is obtained by subjecting a surface of base metal in the sheet after finish annealing to a particular mechanical polishing and has a surface roughness having a center-line average roughness of not more than 0.3 .mu.m after the polishing and the number of abrasive grains embedded in a layer just beneath polished surface of not more than 20,000 grains/cm.sup.2.
    Type: Grant
    Filed: July 28, 1988
    Date of Patent: March 6, 1990
    Assignee: Kawasaki Steel Corp.
    Inventors: Ujiihiro Nishiike, Yasuhiro Kobayashi, Hirotake Ishitobi, Shiqeko Sujita, Norio Takahashi, Hisanao Nakahara, Yukio Inokuti