Patents by Inventor Masanori Shibahara

Masanori Shibahara 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).

  • Highly corrosion-resistant rare-earth-iron magnets
    Patent number: 5154978
    Abstract: A highly corrosion-resistant rare-earth-iron magnet has a paraxylylene polymer film or a chloropara-xylylene polymer film formed thereon. The substrate magnet surface has a roughness Ra of no more than one micron. The magnet has a plasma polymer film formed beforehand or afterwards. The plasma polymer film has a protective film consists of only carbon and hydrogen, with a refractive index decreasing from the boundary surface between the film and the magnet toward the exposed surface. The protective coating has a thickness about three times the surface roughness of the substrate magnet.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: October 13, 1992
    Assignee: TDK Corporation
    Inventors: Masatoshi Nakayama, Koichi Yajima, Kenji Nakaya, Kunihiro Ueda, Masanori Shibahara, Takatoshi Ooyama, Michihiro Nemoto