Patents by Inventor Makiko Yokoi

Makiko Yokoi 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 photographic light-sensitive material, photographic emulsion, and mercapto group-containing polymer compound used for them
    Patent number: 7439309
    Abstract: Disclosed is a silver halide photographic light-sensitive material, which has at least one polymer compound having a nitrogen-containing aromatic ring having a mercapto group represented by the formula Z-SH wherein Z represents a nitrogen-containing aromatic ring as a partial structure. This silver halide photographic light-sensitive material can stably contain silver halide grains of a high aspect ratio showing high sensitivity and superior planarity, shows superior pressure resistance and can be stably prepared.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: October 21, 2008
    Assignee: Fujifilm Corporation
    Inventors: Terukazu Yanagi, Makiko Yokoi, Mamoru Sakurazawa, Yoshihisa Tsukada, Seiji Hatano
  • Azo dye
    Patent number: 7358344
    Abstract: An azo dye represented by formula (I): A-N?N—B??formula (I) wherein, A represents a group having a substituent required for inducing an intramolecular nucleophilic substitution reaction with a nitrogen atom of a reduced azo group as a nucleophilic species when the azo group is reductively decomposed, the group forming a compound containing the nitrogen atom in a ring structure, and B represents an aromatic or hetero ring which is bound to the azo group through a carbon atom.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: April 15, 2008
    Assignee: Fujifilm Corporation
    Inventors: Yasuhiro Shimada, Yasuhiro Ishiwata, Makiko Yokoi
  • Silver halide photographic light-sensitive material, photographic emulsion, and mercapto group-containing polymer compound used for them
    Publication number: 20050171296
    Abstract: Disclosed is a silver halide photographic light-sensitive material, which has at least one polymer compound having a nitrogen-containing aromatic ring having a mercapto group represented by the formula Z-SH wherein Z represents a nitrogen-containing aromatic ring as a partial structure. This silver halide photographic light-sensitive material can stably contain silver halide grains of a high aspect ratio showing high sensitivity and superior planarity, shows superior pressure resistance and can be stably prepared.
    Type: Application
    Filed: March 22, 2005
    Publication date: August 4, 2005
    Inventors: Terukazu Yanagi, Makiko Yokoi, Mamoru Sakurazawa, Yoshihisa Tsukada, Seiji Hatano
  • Azo dye
    Publication number: 20050119467
    Abstract: An azo dye represented by formula (I): A-N?N—B??formula (I) wherein, A represents a group having a substituent required for inducing an intramolecular nucleophilic substitution reaction with a nitrogen atom of a reduced azo group as a nucleophilic species when the azo group is reductively decomposed, the group forming a compound containing the nitrogen atom in a ring structure, and B represents an aromatic or hetero ring which is bound to the azo group through a carbon atom.
    Type: Application
    Filed: November 4, 2004
    Publication date: June 2, 2005
    Applicant: Fuji Photo Film Co., Ltd.
    Inventors: Yasuhiro Shimada, Yasuhiro Ishiwata, Makiko Yokoi
  • Silver halide photographic light-sensitive material, photographic emulsion, and mercapto group-containing polymer compound used for them
    Patent number: 6897014
    Abstract: Disclosed is a silver halide photographic light-sensitive material, which comprises at least one polymer compound having a nitrogen-containing aromatic ring having a mercapto group represented by the formula Z—SH wherein Z represents a nitrogen-containing aromatic ring as a partial structure. This silver halide photographic light-sensitive material can stably contain silver halide grains of a high aspect ratio showing high sensitivity and superior planarity, shows superior pressure resistance and can be stably prepared.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: May 24, 2005
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Terukazu Yanagi, Makiko Yokoi, Mamoru Sakurazawa, Yoshihisa Tsukada, Seiji Hatano
  • Silver halide photographic light-sensitive material, photographic emulsion, and mercapto group-containing polymer compound used for them
    Publication number: 20040038160
    Abstract: Disclosed is a silver halide photographic light-sensitive material, which comprises at least one polymer compound having a nitrogen-containing aromatic ring having a mercapto group represented by the formula Z—SH wherein Z represents a nitrogen-containing aromatic ring as a partial structure. This silver halide photographic light-sensitive material can stably contain silver halide grains of a high aspect ratio showing high sensitivity and superior planarity, shows superior pressure resistance and can be stably prepared.
    Type: Application
    Filed: February 14, 2003
    Publication date: February 26, 2004
    Inventors: Terukazu Yanagi, Makiko Yokoi, Mamoru Sakurazawa, Yoshihisa Tsukada, Seiji Hatano