Patents by Inventor Naoyuki Nagashima

Naoyuki Nagashima 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: 6214448
    Abstract: Disclosed is a magnetic recording medium excellent in surface properties, good in electromagnetic characteristics, and excellent in durability, which comprises a non-magnetic support and a magnetic layer formed thereon, wherein said magnetic layer contains a ferromagnetic powder, and as binders, at least a vinyl chloride resin having a S-containing polar group and a polyurethane resin having phosphobetaine and/or phosphamine as a polar group.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: April 10, 2001
    Assignee: TDK Corporation
    Inventors: Hideki Sasaki, Naoyuki Nagashima, Masatoshi Uchida, Shigeyo Miyamori
  • Magnetic recording medium
    Patent number: 6168856
    Abstract: Disclosed is a magnetic recording medium excellent in surface properties, good in electromagnetic characteristics, and excellent in durability, which comprises a non-magnetic support and a magnetic layer formed thereon through a non-magnetic layer, in which the non-magnetic layer contains, as binders, a vinyl chloride resin having carboxylic acid and amine polar groups, and a polyurethane resin having phosphobetaine and/or phosphamine as a polar group.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: January 2, 2001
    Assignee: TDK Corporation
    Inventors: Hideki Sasaki, Naoyuki Nagashima, Masatoshi Uchida, Shigeyo Miyamori
  • Polyoxymethylene articles having printable surface method of imparting printability to polyoxymethylene
    Patent number: 5837744
    Abstract: Polyoxymethylene articles having a surface printable with an ultraviolet-curing ink are obtained by molding a polyoxymethylene and treating the molded article by ultraviolet irradiation, corona discharge, or electron-beam radiation until the surface has an X-ray photoelectron spectrum in which the ratio of the ?C--O!.sub.n bond peak at 302 eV to the C--C bond peak at 305 eV, i.e., the ?C--O!.sub.n bond peak/C--C bond peak ratio, is at least 2.5.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: November 17, 1998
    Assignee: TDK Corporation
    Inventors: Naoyuki Nagashima, Hitoshi Azegami, Yasufumi Takasugi