Patents by Inventor Tamio Nagatsuka

Tamio Nagatsuka 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).

  • Iron oxide powder and a process of producing the same
    Publication number: 20050147820
    Abstract: Iron oxide powder for an undercoat layer of a coat-type magnetic recording medium having a multilayer structure which comprises cobalt-doped iron oxide particles having an average length of 0.02 to 0.3 ?m, an aspect ratio (length to width ratio) of 2 to 13, and a BET specific surface area of 40 to 100 m2/g and containing a cobalt compound in an amount of 0.2 to 10 atom % in terms of cobalt based on total iron.
    Type: Application
    Filed: March 5, 2003
    Publication date: July 7, 2005
    Applicant: Kanto Denka Kogyo Co., Ltd.
    Inventors: Tamio Nagatsuka, Shinji Iizuka, Takashi Saito, Yosimi Moriya, Masatomo Hayashi
  • Iron oxide powder for undercoat layer of coat-type magnetic recording medium having multilayer structure and a process of producing the same
    Publication number: 20050120918
    Abstract: Iron oxide powder for an undercoat layer of a coat-type magnetic recording medium having a multilayer structure which comprises cobalt-doped iron oxide particles having an average length of 0.02 to 0.3 ?m, an aspect ratio (length to width ratio) of 2 to 13, and a BET specific surface area of 40 to 100 m2/g, containing a cobalt compound in an amount of 0.2 to 10 atom % in terms of cobalt based on total iron, and having a pH of 6 to 8, a soluble cation content of 50 ppm or less, and a soluble anion content of 50 ppm or less.
    Type: Application
    Filed: March 5, 2003
    Publication date: June 9, 2005
    Applicant: Kanto Denka Kogyo Co., LTD.
    Inventors: Shinji Iizuka, Tamio Nagatsuka, Takashi Saito, Yosimi Moriya, Masatomo Hayashi