Patents by Inventor Katuya Yabuuchi

Katuya Yabuuchi 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: 5206124
    Abstract: A silver halide color photographic light-sensitive material is disclosed. The light-sensitive material is excellent in reproducibility of blue-green or green colored photographic subject. The light-sensitive material has a blue-sensitive layer, green-sensitive layer and a red-sensitive layer. The blue-sensitive layer has the maximum spectral sensitivity at a wavelength within the range of 415 to 470 nm and the spectral sensitivity at 480 nm of the blue-sensitive layer is not more than 35% of the maximum sensitivity. The green-sensitive layer has the maximum spectral sensitivity at a wavelength within the range of 530 nm to 560 nm and the spectral sensitivity at 500 nm of the green-sensitive layer is not less than 25% of the maximum sensitivity.
    Type: Grant
    Filed: February 11, 1992
    Date of Patent: April 27, 1993
    Assignee: Konica Corporation
    Inventors: Hiroshi Shimazaki, Yasushi Irie, Katuya Yabuuchi
  • Patent number: 5180657
    Abstract: A silver halide color photographic light-sensitive material which offers high chroma and excellent hue reproduction comprises a support having thereon a blue-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer and a red-sensitive silver halide emulsion layer, wherein the maximum sensitivity wavelength .lambda..sub.B of a spectral sensitivity distribution of said blue-sensitive silver halide emulsion layer is in the range of 410 nm.ltoreq..lambda..sub.B .ltoreq.470 nm; and the sensitivity of said blue-sensitive silver halide emulsion layer at 480 nm is not more than half of the sensitivity at said wavelength .lambda..sub.B. Preferably, the maximum sensitivity wavelength .lambda..sub.G of said green-sensitive layer is in the range of 530 nm.ltoreq..lambda..sub.G .ltoreq.560 nm and the sensitivity of said green-sensitive layer at the wavelength of 500 nm is not less than one-fourth of the sensitivity at SG.sub.max ; the maximum sensitivity wavelength .lambda..sub.
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: January 19, 1993
    Assignee: Konica Corporation
    Inventors: Fumie Fukazawa, Yasushi Irie, Hiroshi Shimazaki, Katuya Yabuuchi, Satoru Shimba
  • Patent number: 4994351
    Abstract: A silver halide color photographic material is described which is to be processed by a scheme including at least the step of development with a color developer having a pH of at least 11 wherein said material contains a specific pyrazoloazole based magenta coupler and a compound that react with the oxidized product of a color developing agent and which substantially lacks the ability to impart an image density. The color photographic material is improved in granularity and color reproduction and yet permits efficient desilvering.
    Type: Grant
    Filed: June 15, 1989
    Date of Patent: February 19, 1991
    Assignee: Konica Corporation
    Inventors: Yoshihiro Haga, Katuya Yabuuchi, Yasumasa Numata
  • Patent number: H1196
    Abstract: A silver halide color photographic light-sensitive material comprising a support having thereon a blue-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer and a red-sensitive silver halide emulsion layer, whereina maximum sensitivity wavelength .lambda..sub.R of a spectral sensitivity distribution of said red-sensitive silver halide emulsion layer is in a range of 595 nm.ltoreq..lambda..sub.R .ltoreq.625 nm;a maximum sensitivity wavelength .lambda..sub.G of a spectral sensitivity distribution of said green-sensitive silver halide emulsion layer is in a range of 530 nm.ltoreq..lambda..sub.G .ltoreq.560 nm; anda sensitivity of said green-sensitive silver halide emulsion layer at 500 nm is not less than one-fourth of the sensitivity at the maximum sensitivity wavelength .lambda..sub.G.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: June 1, 1993
    Assignee: Konica Corporation
    Inventors: Fumie Fukazawa, Katuya Yabuuchi, Hirofumi Ohtani
  • Patent number: H1243
    Abstract: A silver halide color photoqraphic light-sensitive material having an excellent graininess, sharpness and color reproducibility, particularly of green colors including yellowish qreen and bluish qreen is disclosed. Among silver halide emulsion layers, the blue-sensitive layer is located furthest from a support and the outside thereof, has a non-light-sensitive layer. And the optical specifications of these two layers are as specified in the claims.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: October 5, 1993
    Assignee: Konica Corporation
    Inventors: Satoru Shimba, Keisuke Tobita, Kenji Michiue, Katuya Yabuuchi