Patents by Inventor Hiroshi Iihoshi

Hiroshi Iihoshi 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).

  • Powder for lower layer of application type of layered magnetic recording medium and magnetic recording medium using the same
    Publication number: 20060166040
    Abstract: An underlayer powder for a coating-type double-layer magnetic recording medium is a powder composed of acicular nonmagnetic iron oxide particles whose average major axis length of the particles is 20-200 nm, and specific surface area calculated by BET method is 30-100 m2/g, which has a phosphorus content in the particulate powder of 0.1-5 wt %, and soluble phosphorus compound of not greater than 100 ppm based on P, and which preferably has a powder pH of less than 8, a soluble sodium content of not greater than 100 ppm based on Na and soluble sulfate of not greater than 100 ppm based on SO4.
    Type: Application
    Filed: July 1, 2004
    Publication date: July 27, 2006
    Inventors: Shinichi Konno, Kenichi Inoue, Ken Inoue, Hiroshi Iihoshi, Toshihiko Ueyamaa