Patents by Inventor Sadafumi Koshino

Sadafumi Koshino 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).

  • Stamper original and its manufacturing method, stamper and its manufacturing method, and optical disk
    Publication number: 20050181089
    Abstract: An object of the present invention is to provide a stamper preform and others capable of obviating an Ni electroforming step taking a long time and readily producing a defective in production of a stamper and capable of forming an accurate and fine pattern of projections and indentations. A stamper preform 11 of the present invention has a base 1, a semi-crosslinked resist layer 2, and a prebaked resist layer 3 stacked in this order. The prebaked resist layer 3 contains a methoxymethyl melamine and bumps are readily formed therein by exposure and development (FIG. 1C).
    Type: Application
    Filed: April 15, 2003
    Publication date: August 18, 2005
    Applicant: NAGASE & CO. LTD
    Inventors: Shu Ogawa, Shojiro Yamanaka, Sadafumi Koshino, Koji Miyake, Kazuhiko Sano