Patents by Inventor Masanori Arayashiki

Masanori Arayashiki 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 disk medium with circumferentially textured surfaces and varied surface roughness and method of producing the same
    Patent number: 4939614
    Abstract: A magnetic disk medium in which texture working is performed on surfaces of a substrate or on surfaces of subbing films provided on the substrate to attain circumferential worked-traces so that the contact start stop area thereof is different from the recording/reproducing area thereof in roughness of the worked surfaces.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: July 3, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Takaaki Shirakura, Shinya Matsuoka, Hiroshi Yashiki, Masanori Arayashiki, Masaki Ohura