Patents by Inventor Yoshihide Urakawa

Yoshihide Urakawa 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).

  • Silver halide color negative photographic light sensitive material
    Patent number: 5437966
    Abstract: The present invention describes a silver halide color negative photographic light-sensitive material having an improved graininess and an excellent image quality even when picture-taken under various light sources each having a color temperature different from daylight. A silver halide color photographic material comprises a light-sensitive layer unit containing a red-sensitive silver halide emulsion and a cyan coupler, a light-sensitive layer unit containing a green-sensitive silver halide emulsion and a magenta coupler, and a light-sensitive layer unit containing a blue-sensitive silver halide emulsion and a yellow coupler, wherein RMS granularity of at least one of the light-sensitive layer units has the following relations;1.1 RMS.sub.0 .ltoreq.RMS.sub.1 .ltoreq.1.5 RMS.sub.0 and0.9 RMS.sub.0 .ltoreq.RMS.sub.2 .ltoreq.1.2 RMS.sub.0wherein RMS.sub.0 is an RMS value at a minimum density portion of the layer unit, RMS.sub.1 is an RMS value at a density portion of the minimum density+0.
    Type: Grant
    Filed: March 23, 1994
    Date of Patent: August 1, 1995
    Assignee: Konica Corporation
    Inventors: Hideaki Haraga, Toshihiko Yagi, Miki Kon, Hiroshi Shimazaki, Yoshihide Urakawa, Yoshitaka Yamada, Atsuo Ezaki, Syoji Matsuzaka