Patents by Inventor Tadahisa Sato

Tadahisa Sato 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: 4774172
    Abstract: Silver halide color photographic materials are described, which comprise at least one silver halide emulsion layer coated on a support and which are characterized by the incorporation of a pyrazoloazole type coupler of the following general formula (I) into the silver halide emulsion layer(s) or the adjacent layer(s) thereto: ##STR1## wherein Za and Zb each may represent ##STR2## R.sup.1 and R.sup.2 each may represent a hydrogen atom or a substituent; X represents a hydrogen atom or a group capable of being removed upon a coupling reaction with an oxidized form of an aromatic primary amine type developing agent; when Za.dbd.Zb is a carbon-carbon double bond, this may be a part of the aromatic ring in the formula: with the proviso that at least one of R.sup.1 and R.sup.2 is a group represented by general formulae (II) or (III): ##STR3## wherein R.sup.3 represents a hydrogen atom or a substituted or unsubstituted alkyl group; R.sup.4 represents a hydrogen atom or a substituent; R.sup.
    Type: Grant
    Filed: November 28, 1986
    Date of Patent: September 27, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshio Kawagishi, Takayoshi Kamio, Keizo Kimura, Tadahisa Sato, Nobuo Furutachi
  • Patent number: 4770987
    Abstract: A silver halide color photographic material is disclosed, comprising a support having provided thereon at least one silver halide emulsion layer having dispersed therein lipophilic fine particles containing an image dye forming lipophilic coupler, wherein the lipophilic fine particles further contain at least one lipophilic compound having a water-solubility of not more than 1% by weight at 25.degree. C. and represented by formula (I):R.sub.0 SO.sub.2 X (I)wherein R.sub.0 represents a substituted or unsubstituted alkyl, aryl or heterocyclic group having 8 or more total carbon atoms; and X represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, a nitrogen-containing organic base, ammonium or a group represented by formula (A): ##STR1## wherein R.sub.1 represents a hydrogen atom or a substituted or unsubstituted alkyl, aryl or heterocyclic group; R.sub.2 represents a hydrogen atom, a halogen atom or a substituted or unsubstituted alkyl, aryl, acyloxy or sulfonyl group; and R.sub.
    Type: Grant
    Filed: December 17, 1986
    Date of Patent: September 13, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Osamu Takahashi, Hideaki Naruse, Masakazu Morigaki, Nobutaka Ohki, Tadahisa Sato
  • Patent number: 4721667
    Abstract: A color light-sensitive material is provided, having at least one image forming compound of the following formula (I) on support.(Dye-X).sub.q -Y (I)wherein Dye represents a yellow dye residue represented by the following formula (II) or a dye precursor residue; X represents a bond or a binding group; Y represents a group capable of yielding a difference of diffusibility of a dye component before and after the reaction with a photographic silver salt imagewise having a latent image, corresponding to or reversely corresponding to said photographic silver salt; q is 1 or 2, and when q is 2, Dye-X may be the same or different; ##STR1## wherein R.sup.1, R.sup.2 and R.sup.
    Type: Grant
    Filed: May 16, 1986
    Date of Patent: January 26, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Sato, Tadahisa Sato, Takeshi Shibata
  • Patent number: 4705863
    Abstract: Pyrazolo[1,5-b][1,2,4]triazole derivatives are produced by ring closure of an amidoxime compound having a pyrazolyl group. The product can be used as a photographic magenta coupler as such. It is also useful as an intermediate for the magenta coupler, as a dye developer for diffusion transfer process, as an intermediate for the dye releasing agent, and as an intermediate for the photographic sensitizing dye.
    Type: Grant
    Filed: March 20, 1985
    Date of Patent: November 10, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadahisa Sato, Toshio Kawagishi, Nobuo Furutachi
  • Patent number: 4621046
    Abstract: A novel pyrazolo[1,5-b]-1,2,4-triazole derivative represented by the general formula (I) is described. ##STR1## wherein R.sub.1 and R.sub.2 which may be the same or different, each represents a hydrogen atom or a substituent; X represents a hydrogen atom or a group capable of being released upon coupling; and Y represents a hydrogen atom or an aralkyl group.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: November 4, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadahisa Sato, Toshio Kawagishi, Nobuo Furutachi
  • Patent number: 4607003
    Abstract: A photographic element comprising a support and at least one silver halide emulsion layer. The photographic element contains at least one layer containing at least one of the dyes represented by the following formula (I), (II), (III), (IV), (V), (VI), (VII) or (VIII): ##STR1## wherein Z.sub.1 to Z.sub.10 ; R.sub.1 to R.sub.24 ; L.sub.1 to L.sub.18 ; Y.sub.1 to Y.sub.8 ; Q.sub.1 to Q.sub.4 ; X.sub.1 to X.sub.3 ; Ar; h, m, p and r; and t.sub.1 to t.sub.3 are described in the specification.
    Type: Grant
    Filed: April 9, 1985
    Date of Patent: August 19, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshinao Ukai, Tadahisa Sato, Toshio Kawagishi, Haruo Takei
  • Patent number: 4540654
    Abstract: A method of forming a color image comprising developing a silver halide photographic light-sensitive material with a developing solution containing an aromatic primary amine is disclosed. The developing is carried out in the presence of a coupler represented by the general formula (I) described below and/or a polymer coupler which is a polymer or copolymer having a repeating unit derived from a vinyl monomer containing a part represented by the general formula (I) described below in its molecule: ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a hydrogen atom or a substituent; and X represents a hydrogen atom or a group capable of being released upon coupling.
    Type: Grant
    Filed: March 19, 1984
    Date of Patent: September 10, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadahisa Sato, Toshio Kawagishi, Nobuo Furutachi
  • Patent number: 4500630
    Abstract: A silver halide photosensitive material is developed with a developing solution containing an aromatic primary amine in the presence of a coupler represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represents a hydrogen atom or a certain substituent group, and X represents a hydrogen atom or a coupling eliminable group; to provide magenta color image having high color purity.
    Type: Grant
    Filed: February 15, 1984
    Date of Patent: February 19, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadahisa Sato, Toshio Kawagishi, Nobuo Furutachi
  • Patent number: H131
    Abstract: Silver halide color photographic materials contain pyrazoloazole type magenta couplers having at least one hydroxyphenyl group bonded thereto. The silver halide color photographic materials are improved in color developability and color image light fastness. The pyrazoloazole type magenta couplers are 5-membered ring/5-membered ring condensed nitrogen heterocyclic type couplers.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: September 2, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuo Furutachi, Tadahisa Sato, Toshio Kawagishi, Kiyoshi Nakazyo