Patents by Inventor Hitoshi Nagatani

Hitoshi Nagatani 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).

  • Magnetic recording medium
    Patent number: 5256481
    Abstract: A magnetic recording medium suitable for high density recording having improved erasing characteristics is produced by a method comprising the steps of forming an under coat layer containing an electrically conductive material on at least one surface of a substrate, applying a magnetic paint containing hexagonal system ferrite magnetic powder on the under coat layer and drying the applied magnetic paint to form a magnetic layer having a thickness of not larger than 0.7 .mu.m.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: October 26, 1993
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Akira Miyake, Mikio Kishimoto, Masaya Funahashi, Teruhisa Miyata, Hitoshi Nagatani
  • Magnetic disc
    Patent number: 4828925
    Abstract: A magnetic disc which comprises a non-magnetic support substrate and a magnetic layer thereon consisting of a magnetic coating comprising ferromagnetic powder, a binder, an aliphatic acid ester having a melting point not higher than 10.degree. C. and an aliphatic acid ester having a melting point from 15.degree. to 60.degree. C., the magnetic coating having improved lubricity and durability.
    Type: Grant
    Filed: June 18, 1986
    Date of Patent: May 9, 1989
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Akira Miyake, Hitoshi Nagatani, Tsugihiro Doi, Kunio Mizushima, Akito Sakemoto