Patents by Inventor Takatoshi Ishikawa

Takatoshi Ishikawa 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: 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: 4914007
    Abstract: An image forming process is disclosed, which comprises, in the photographic processing of silver halide color photographic materials, processing the color photographic material having a swelling degree of the photographic layer(s) of from 1.5 to 4.0 in the water washing step for the total water washing processing time of from 30 to 90 seconds. According to the process of the invention, the storage stability of color images obtained after processing and/or after lapsing a time does not reduce even when the water washing processing time is shortened.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: April 3, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Fujita, Takatoshi Ishikawa
  • Patent number: 4900651
    Abstract: A method for processing a silver halide color photographic material is disclosed, which comprises developing a silver halide color photographic material with a color developer comprising:(a) an aromatic primary amine color developing agent;(b) at least one brightening agent represented by formula (I) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydroxyl group, an alkoxy group, an amino group, an alkylamino group, an aryloxy group or an arylamino group; provided that R.sub.1 is not the same as R.sub.3 when R.sub.2 is the same as R.sub.4, and R.sub.1 is not the same as R.sub.4 when R.sub.2 is the same as R.sub.3 ; and M represents a monovalent cation; and(c) at least one organic phosphonic acid series chelating agent.
    Type: Grant
    Filed: February 22, 1988
    Date of Patent: February 13, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Hiroshi Fujimoto
  • 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: 4880728
    Abstract: The present invention relates to a processing method for a silver halide color photographic material, which makes it possible to substantially reduce the amount of waste liquor and the pollution of the environments. In the process, the color photosensitive material is continuously developed, and the process is characterized in that all or a part of the overflow of a color developer being substantially free from benzyl alcohol is used as a part of a processing solution used in a process other than the color development process.
    Type: Grant
    Filed: March 26, 1987
    Date of Patent: November 14, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Junya Nakajima
  • Patent number: 4876174
    Abstract: The present invention relates to a method of processing a silver halide color photosensitive material. In particular, to a rapid processing method capable of reducing the development time. In the processing method, an exposed silver halide color photosensitive material having at least one emulsion layer containing a silver halide having a chlorine content of at least 80 molar % based on the total halogens is processed with a color developer containing an aromatic primary amine color developing agent and a dialkylhydroxylamine of the following general formula (I) but substantially free of benzyl alcohol: ##STR1## wherein R.sup.1 and R.sup.2 each represent an unsubstituted or substituted alkyl group or an unsubstituted or substituted alkenyl group or R.sup.1 and R.sup.2 may form a hetero ring together with nitrogen atom.
    Type: Grant
    Filed: June 18, 1987
    Date of Patent: October 24, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Morio Yagihara
  • Patent number: 4863836
    Abstract: There is provided a method for processing a silver halide color photographic material which comprises processing the silver halide color photographic material with a color developer containing an aromatic primary amine color developing agent and a specific amino compound. According to this method the stability and color forming property of a color developer are improved so that the increased fogging problem in continuous processing is lessened and the processing time is shortened. There is also provided a color developer composition which can be used as the developer, as it is or after adjusting its composition.
    Type: Grant
    Filed: February 22, 1988
    Date of Patent: September 5, 1989
    Assignee: Fuji Photo Film, Co., Inc.
    Inventors: Takatoshi Ishikawa, Nobutaka Ohki, Morio Yagihara
  • Patent number: 4853318
    Abstract: A process for processing color photographic papers using a color developer substantially free from benzyl alcohol and containing a compound represented by formula (I) ##STR1## wherein Z represents an atomic group forming an aromatic nucleus is disclosed. In the process, the formation of color stains is greatly reduced even in the case of shortening the processing times for the blix step and the wash and/or stabilization step after color development.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: August 1, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Fujita, Hiroshi Fujimoto, Takatoshi Ishikawa, Shinzo Kishimoto
  • Patent number: 4851326
    Abstract: A silver halide color photographic material having at least one silver halide emulsion layer on a reflective support is, after having been imagewise exposed, subjected to color development with a color developer which does not substantially contain benzyl alcohol and which contains a bromide ion in an amount of 4.times.10.sup.-3 mol/liter or less, for a period of time of 2 minutes or less, to obtain a color images with a high colored density. The silver halide color photographic material specifically has at least one silver chlorobromide emulsion layer which does not substantially contain silver iodide and which contains silver chloride in an amount of 50 mol % or more.In the color images thus formed by the present process, the colored density is high and the fog is less.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: July 25, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Junya Nakajima
  • Patent number: 4845016
    Abstract: A process for processing a silver halide color photographic material is described, which comprises processing by treatment with a color developer containing an aromatic primary amine developing agent but substantially free from benzyl alcohol, for a time shorter than 2 min and 30 sec, a silver halide color photographic material having on a support at least one photograph-constituting layer containing a compound represented by formula (I) ##STR1## wherein R.sub.0 represents a substituted or unsubstituted aryl group; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group; and Z represents a hydrogen atom or a substituted or unsubstituted acetyl group.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: July 4, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Nobuo Sakai
  • 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: 4837132
    Abstract: A method is described for processing a silver halide color photographic material after imagewise exposure, comprising color developing, desilvering, and at least one of washing and stabilizing a silver halide color photographic material, wherein a color developer which does not substantially contain benzyl alcohol but comprises at least one compound represented by formula (I) ##STR1## wherein M.sup.1, M.sup.2, M.sup.3 and M.sup.4 each represents a hydrogen atom, an alkali metal ion, an ammonium ion, or 1/n of an n-valent cation is used for the color development.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: June 6, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Fujimoto, Takatoshi Ishikawa
  • Patent number: 4835092
    Abstract: A novel method for processing a silver halide color photographic material is provided, which comprises processing a silver halide color photographic material having at least one silver halide emulsion layer on a reflective support with a color-developing solution substantially free of benzyl alcohol and containing at least one compound represented by formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom, --CH.sub.2 COOH, or ##STR2## R.sub.2 represents a hydrogen atom or --COOH; n represents an integer of 0 or 1; and Z represents atoms necessary for the formation of an aromatic ring.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: May 30, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Toshio Koshimizu, Yoshihiro Fujita, Hiroshi Fujimoto
  • Patent number: 4830948
    Abstract: A method of forming color photographic images where a silver halide color photographic material containing a coupler which forms a dye by reaction with the oxidation product of an aromatic primary amine developing agent and containing an acid-processed gelatin in an amount of 25% by weight or more of the amount of the total gelatin coated is color developed, desilvered and then rinsed in water and/or stabilized. The total of the processing time of said desilvering, rinsing-in-water and stabilization steps is controlled to be 3 minutes or less, and/or the amount of replenisher added to the rinsing-in-water bath and stabilization bath is controlled to be from 0.5 to 50 times of the amount of the processing solution which is brought into the rinsing-in-water bath and stabilization bath from the desilvering bath together with the material which is being processed.
    Type: Grant
    Filed: March 17, 1988
    Date of Patent: May 16, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Genichi Furusawa, Takeshi Hirose
  • 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: 4801516
    Abstract: There is provided a method of processing a silver halide color photographic material which comprises processing the silver halide color photographic material with a color developer containing an aromatic primary amine color developing agent and a specific hydroxylamine compound. According to this method the stability of a color developer is improved so that the increased fogging problem in continuous processing is lessened and the processing time is shortened.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: January 31, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Morio Yagihara
  • Patent number: 4800153
    Abstract: There is provided a method for processing a silver halide color photographic material which comprises processing the silver halide color photographic material with a color developer containing an aromatic primary amine color developing agent and a specific amino compound. According to this method the stability and color forming property of a color developer are improved so that the increased fogging problem in continuous processing is lessened and the processing time is shortened. There is also provided a color developer composition which can be used as the developer, as it is or after adjusting its composition.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: January 24, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kiyoshi Morimoto, Takatoshi Ishikawa
  • Patent number: 4798783
    Abstract: A method of processing a silver halide color photographic material in which the color developer used comprises an aromatic primary amine color developing agent and a compound of formula: ##STR1## wherein X represents a trivalent group necessary to complete a condensed ring;R.sup.1 and R.sup.2 each represents an alkylene group, an arylene group, an alkenylene group, or an aralkylene group;and, if desired, does not contain a substantial amount of benzyl alcohol to achieve improved stability and color developability of the color developer and a reduction of fog generation in the running development process.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: January 17, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Hiroshi Fujimoto, Nobutaka Ohki, Morio Yagihara
  • Patent number: 4774167
    Abstract: A method for processing a silver halide color photographic material is provided, which comprises subjecting an imagewise exposed silver halide color photographic material having at least one silver halide emulsion layer on a reflective support to color development for a period not exceeding 2 minutes and 30 seconds using a color-developing solution containing substantially no benzyl alcohol, a sulfite in a concentration of 8.times.10.sup.-3 mol/liter or less, and a hydroxylamine in a concentration of 1.5.times.10.sup.-2 mol/liter or less, thereby achieving high color densities of the developed images and reduced fog. The effects of this method are particularly significant in photographic paper containing a pyrazoloazole type magenta coupler.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: September 27, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshio Koshimizu, Takatoshi Ishikawa, Shinji Ueda
  • Patent number: 4764455
    Abstract: A color image-forming process is described, for a silver halide color photographic material comprising a support having provided thereon at least one red-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer, and at least one blue-sensitive silver halide emulsion layer, which process comprises incorporating in the photographic material a yellow dye represented by formula (I) and processing the photographic material using a bleach-fixing solution containing a ferric complex of aminopolycarboxylic acid and a thiosulfate ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxy group, a carboxy group, a substituted amino group, a carbamoyl group, a sulfamoyl group, a nitro group or an alkoxycarbonyl group;R.sub.3 and R.sub.
    Type: Grant
    Filed: August 6, 1986
    Date of Patent: August 16, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Jun Arakawa, Masahiro Okada, Takatoshi Ishikawa