Patents by Inventor Hirofumi Kurosawa

Hirofumi Kurosawa 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).

  • Optical disk stamper examination machine, optical disk stamper examination method, and optical disk stamper
    Patent number: 6635896
    Abstract: A glass substrate is affixed through an UV-hardening resin to the signal face of an optical stamper and is examined using an optical head having optical constants equivalent to those of a disk examination machine, thus making it possible to obtain characteristic playback examination results equivalent to those obtained from disks manufactured using the optical stamper, wherefore optical stamper quality can be easily assessed.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: October 21, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Kimio Hirono, Hirofumi Kurosawa, Noboru Furuya