Patents by Inventor Kazuto Andoh

Kazuto Andoh 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: 5064751
    Abstract: A method for processing a silver halide color photographic material including the step of developing the silver halide color photographic material with a color developing solution containing at least one aromatic primary amine developing agent and at least one hydrazide represented by the following formula (I) or (II)R.sup.1 --X.sup.1 --NHNH--R.sup.2 (I)in whichX.sup.1 represents --CO--, --SO.sub.2 -- or ##STR1## R.sup.1 represents a hydroxyl group, a hydroxyamino group, carbamoyl group, a hydrazinocarbonyl group, an amino group, or a hydrazino group; and R.sup.2 represents a hydrogen atom, an alkyl group, or an aryl group; provided that the R.sup.1 or R.sup.2 groups of at least two of the hydrazide groups may be linked to form a dimer or higher polymer of the hydrazide.R.sup.3 --X.sup.2 --NHNH--R.sup.4 (II)in whichX.sup.2 represents --CO-- or --SO.sub.2 --; R.sup.3 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, an alkoxy group, or an aryloxy group; and R.sup.
    Type: Grant
    Filed: January 23, 1991
    Date of Patent: November 12, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Kazuto Andoh, Hideaki Naruse, Hiroshi Fujimoto, Jiro Tsukahara, Morio Yagihara, Takatoshi Ishikawa
  • Patent number: 5006456
    Abstract: A method for processing a silver halide color photographic light-sensitive material comprises the steps of developing the light-sensitive material with a color developer containing an aromatic primary amine color developing agent, desilvering, washing with water and/or stabilizing the material in which at least one processing solution used in at least one step of the processing contains at least one compound selected from the group consisting of sulfinic acids and salts and precursors thereof. This method makes it possible to effectively prevent the formation of stains due to not only the components of the light-sensitive material per se but also those attributable to the processing solutions, during processing or storage with time, and to enhance the stability of processing solutions.
    Type: Grant
    Filed: June 6, 1988
    Date of Patent: April 9, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masakazu Morigaki, Takatoshi Ishikawa, Kazuto Andoh, Nobuo Seto, Toshio Koshimizu, Shinji Ueda
  • Patent number: 4960684
    Abstract: A silver halide color photographic material is processed with a color developer containing at least one compound of the following formula (I) and at least one compound of the following formula (II): ##STR1## where R.sup.1, R.sup.2 and R.sup.3 independently represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group;R.sup.4 represents a hydrogen atom, a hydroxyl group, a hydrazino group, an alkyl group, an aryl group, a heterocyclic group, an alkoxy group, an aryloxy group, a carbamoyl group or an amino group;X.sup.1 represents a divalent group;n represents 0 or 1; and when is 0, R.sup.4 represents an alkyl group, an aryl group or a heterocyclic group; and R.sup.3 and R.sup.4 may together form a heterocyclic group; ##STR2## where Z represents an atomic group necessary for completing an aromatic nucleus.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: October 2, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Hiroshi Fujimoto, Morio Yagihara, Kazuto Andoh
  • Patent number: 4956267
    Abstract: A method for forming a direct positive color image by image-wise exposing to light a light-sensitive material having at least one internal latent image type silver halide emulsion layer which is unfogged and color image-forming couplers on a support; either (1) subjecting the resulting material to fogging exposure to light and/or processing it with a nucleating agent before development, and then developing the resulting material with a surface developing solution containing an aromatic primary amine type color developing agent, or (2) developing the material after the image-wise exposure with a surface developing solution containing an aromatic primary amine type color developing agent under fogging exposure and/or in the presence of a nucleating agent; and bleach-fixing the resulting material, wherein the color developing solution contains at least one compound selected from the group consisting of compounds represented by the following general formulae (I), (II), (III) and (IV): ##STR1## wherein X represent
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: September 11, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shinji Ueda, Tatsuo Heki, Noriyuki Inoue, Takatoshi Ishikawa, Nobutaka Ohki, Morio Yagihara, Kiyoshi Morimoto, Hiroshi Fujimoto, Kazuto Andoh
  • Patent number: 4920041
    Abstract: A method for processing a silver halide color photographic material comprising a reflective support having thereon at least one light-sensitive silver halide emulsion layer containing a color coupler or color couplers, which comprises the step of, after imagewise exposing, developing said silver halide color photographic material with a color developing solution which does not substantially contain benzyl alcohol and which contains an aromatic primary amine color developing agent represented by formula (A): ##STR1## wherein X represents a compound capable of forming a salt with a primary amine; and a compound represented by formula (I): ##STR2## wherein R.sup.1 represents a hydrogen atom or a substituted or unsubstituted alkyl, aryl, alkoxy, aryloxy or amino group; and R.sup.2 represents a hydrogen atom or a substituted or unsubstituted alkyl or aryl group; or R.sup.1 and R.sup.2 may be bonded to each other to form a carbon ring or a hetero-ring.
    Type: Grant
    Filed: January 12, 1989
    Date of Patent: April 24, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Kazuto Andoh, Takatoshi Ishikawa
  • Patent number: 4897339
    Abstract: A method for processing a silver halide color photographic material including a step of developing the material with a developer containing an aromatic primary amine color developing agent and at least one compounds represented by the following general formulae (Ia) and (Ib): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which may be the same or different, each represents a hydrogen atom or an unsubstituted alkyl group; R.sup.5, R.sup.6 and R.sup.7, which may be the same or different, each represents an unsubstituted alkylene group; X.sup.1 and X.sup.2, which may be the same or different, each represents ##STR2## --O--, --S--, --CO--, --SO.sub.2 or --SO--, or a combination thereof, and R.sup.8 represents a hydrogen atom or an unsubstituted alkyl group; and m and n, which may be the same or different, each is 0, 1, 2 or 3; and ##STR3## wherein R.sup.13 represents a substituted alkylene group; and R.sup.9, R.sup.10, R.sup.11 and R.sup.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: January 30, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuto Andoh, Takatoshi Ishikawa, Morio Yagihara
  • Patent number: 4842993
    Abstract: A method for processing a silver halide color photographic material is described, which comprises treating said material after imagewise exposure with a color developer containing an aromatic primary amine developing agent and at least one compound represented by formula (I) ##STR1## in which X.sub.1 and X.sub.2 each represents a divalent organic group. In accordance with this method, the stability and color-forming capacity of the color developer are remarkably improved, the increment of fog during continuous processing of photographic material is greatly reduced, and the color developer need not substantially contain benzyl alcohol.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: June 27, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Morio Yagihara, Hiroshi Fujimoto, Takatoshi Ishikawa, Kazuto Andoh
  • Patent number: 4833068
    Abstract: A developing solution composition for a silver halide color photographic material is described, comprising an aromatic primary amine color developing agent and a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different each represents a hydrogen atom or a substituted or unsubstituted alkyl group; R.sup.3 represents a substituted or unsubstituted alkylene group; and the total number of carbon atoms contained in R.sup.1, R.sup.2 and R.sup.3 is at least 3.The color developer composition has improved stability and color forming properties and remarkably limits fog formation during continuous processing.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: May 23, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Kazuto Andoh, Hiroshi Fujimoto
  • Patent number: 4801521
    Abstract: A method for processing a silver halide color photographic material comprising the step of processing a silver halide color photographic material after imagewise exposure thereof with a color developer containing at least one aromatic primary amine developing agent and at least one hydrazine compound represented by formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, provided that R.sup.1 and R.sup.2 may be linked to form a heterocyclic ring; R.sup.3 and R.sup.4 may be linked to form a heterocyclic ring; and at least two hydrazine moieties derived from the compound represented by formula (I) may be linked to form a dimer or polymer by any of R.sup.1, R.sup.2, R.sup.3, and R.sup.4.
    Type: Grant
    Filed: July 22, 1987
    Date of Patent: January 31, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Nobuo Seto, Hideaki Naruse, Morio Yagihara, Kazuto Andoh, Takatoshi Ishikawa, Hiroshi Fujimoto
  • Patent number: H809
    Abstract: A method for processing a silver halide color photographic material containing at least one pyrazoloazole magenta coupler represented by general formula (I), which comprises processing the light-sensitive material, after imagewise exposure, with a color developer containing an aromatic primary amine color developing agent and at least one member selected from among hydrazines and hydrazides represented by general formula (II): ##STR1## wherein R.sub.11 represents a hydrogen atom or a substituent, X represents a hydrogen atom or a group capable of being eliminated by a coupling reaction with an oxidation product of an aromatic primary amine developing agent, Za, Zb and Zc each represents a methine group, a substituted methine group, .dbd.N-- or --NH--, provided that one of the Za-Zb bond and the Zb-Zc bond is a double bond and the other is a single bond and, when Zb-Zc is a carbon-to-carbon double bond, it may be a part of an aromatic ring, and a dimer or higher polymer may be formed at R.sub.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: August 7, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuto Andoh, Takatoshi Ishikawa, Hiroshi Fujimoto, Morio Yagihara