Patents by Inventor Yoko Kakamu

Yoko Kakamu 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).

  • Patent number: 5985519
    Abstract: A method of manufacturing a semiconductor device for patterning a semiconductor substrate by photolithography, the semiconductor substrate having a transparent or semitransparent layer having a high transmissivity at an exposure wavelength .lambda., and the transparent or semitransparent layer being formed on an underlying structure with a surface having a high reflectivity at the exposure wavelength .lambda.. The method comprises the steps of: forming a resist layer having a refractive index n.sub.r and a thickness d.sub.r on the transparent or semitransparent layer; forming a top antireflection film having a refractive index n.sub.a and a thickness d.sub.a on the resist layer; selectively exposing the resist layer via the top antireflection film with light having the exposure wavelength .lambda.; removing the top antireflection film; and developing a latent image in the resist layer to form a resist pattern, wherein an optical thickness n.sub.a d.sub.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: November 16, 1999
    Assignee: Fujitsu Limited
    Inventors: Yoko Kakamu, Yuichiro Yanagishita