Patents by Inventor Kiyoshi Kuga

Kiyoshi Kuga 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).

  • Perpendicular magnetic recording medium and method for production thereof
    Publication number: 20050037238
    Abstract: The present invention provides a method for easily obtaining a perpendicular magnetic recording medium having the desired magnetic properties by sputtering, and a magnetic recording medium obtained by this method. The perpendicular magnetic recording medium of the present invention is a perpendicular magnetic recording medium comprising at least a soft magnetic underlayer, an underlayer, a magnetic recording layer, a protective layer, and a liquid lubricant layer sequentially laminated on a nonmagnetic substrate, wherein the magnetic recording layer is a rare earth-transition metal alloy amorphous film formed by sputtering, and the formation of the magnetic recording layer by sputtering is performed using a film-forming gas incorporating 2% or more, but 60% or less of an H2 gas. The present invention also discloses a method for producing the perpendicular magnetic recording medium.
    Type: Application
    Filed: September 7, 2004
    Publication date: February 17, 2005
    Applicants: Fuji Electric Co., Ltd., Nippon Hoso Kyokai
    Inventors: Yasushi Sakai, Akihiro Ohtsuki, Keiji Ohkubo, Kazuo Enomoto, Sadayuki Watanabe, Takahiko Tamaki, Kiyoshi Kuga, Eiichi Miyashita, Ryo Taguchi
  • Perpendicular magnetic recording medium and method for production thereof
    Publication number: 20030054205
    Abstract: The present invention provides a method for easily obtaining a perpendicular magnetic recording medium having the desired magnetic properties by sputtering, and a magnetic recording medium obtained by this method. The perpendicular magnetic recording medium of the present invention is a perpendicular magnetic recording medium comprising at least a soft magnetic underlayer, an underlayer, a magnetic recording layer, a protective layer, and a liquid lubricant layer sequentially laminated on a nonmagnetic substrate, wherein the magnetic recording layer is a rare earth-transition metal alloy amorphous film formed by sputtering, and the formation of the magnetic recording layer by sputtering is performed using a film-forming gas incorporating 2% or more, but 60% or less of an H2 gas. The present invention also discloses a method for producing the perpendicular magnetic recording medium.
    Type: Application
    Filed: August 20, 2002
    Publication date: March 20, 2003
    Inventors: Yasushi Sakai, Akihiro Ohtsuki, Keiji Ohkubo, Kazuo Enomoto, Sadayuki Watanabe, Takahiko Tamaki, Kiyoshi Kuga, Eiichi Miyashita, Ryo Taguchi