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: 5466563
    Abstract: A method of processing silver halide photographic material comprises the steps of passing a belt for conveying an imagewise exposed silver halide photographic material through the processing tanks, carrying the silver halide photographic material on the belt and processing the silver halide photographic material conveyed by the belt in the processing tanks while replenishing the tanks with constant amounts of replenishing solutions respectively, wherein the method comprises detecting a level of developing solution in development tank and supplying the development tank with an additional fresh developing tank solution or overflow solution from the development tank when said level of developing solution in the tank falls to a predetermined level. This method makes it possible to reduce an amount of the processing solution waste to be drained from the processing machine.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: November 14, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Bryan A. I. Snelling
  • Patent number: 5432583
    Abstract: A replenisher supplying apparatus includes a plurality of cartridges, a plurality of stock tanks, a plurality of supply devices for supplying the component agents stored in the stock tanks to a processing tank, communication devices for supplying the component agents filled in the cartridges to the stock tanks, detection devices for detecting whether the quantity of each of the component agents stored in the stock tanks has decreased to be equal to or less than a predetermined level, and a control device for operating, at a time when it is judged by the detection devices that the quantity of a component agent stored in one of the stock tanks has decreased to be equal to or less than the predetermined level, and operating one of said supply devices so as to reduce the quantity of a component agent stored in another stock tank to a level equal to or less than the predetermined level, and operating said communication devices so as to supply the component agents to the stock tanks.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: July 11, 1995
    Assignee: Fuji photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Ken Kawada
  • Patent number: 5422698
    Abstract: A photosensitive material processing apparatus having a processing tank in which a processing solution for processing a photosensitive material is stored, and rollers or the like for conveying the photosensitive material along a predetermined path within the processing tank. By maintaining a humidity of upper portion spaces of the processing tank at greater than or equal to 80%RH, dirtying of machinery due to crystal deposition of processing chemicals and non-uniformity of the processing solution are prevented. In order to maintain the humidity of the upper portion spaces of the processing tank at greater than or equal to 80%RH, a cover having an opening ratio of less than or equal to 40% is disposed at an upper portion of the processing tank, and spaces enclosed by the cover are not ventilated by fans. Further, it is preferable that a ratio of a volume of the upper portion spaces of the processing tank enclosed by a cover to an area of an exposed surface of the solution within the processing tank is 0.5 cm.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: June 6, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Ken Kawada, Takatoshi Ishikawa
  • Patent number: 5416551
    Abstract: A replenisher supply apparatus for photosensitive material processor is provided, which includes a cartridge, a replenisher stock tank, a sensor for detecting a solution level of the replenisher in the replenisher stock tank, and a flow means for causing the replenisher to flow from the cartridge mounted on the mount portion to the replenisher stock tank when the sensor detects that the solution level is at a predetermined value or below. As a result, even if the replenisher in the replenisher stock tank runs short during the process, the process can be continued without immediate replacement of the cartridge.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: May 16, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Ken Kawada
  • Patent number: 5380624
    Abstract: A novel process is provided for processing a silver halide color photographic material with a color developing solution containing at least one aromatic primary amine color developing agent, wherein said silver halide color photographic material contains at least one of anti-bacterial agents represented by the general formulas (I), (II), (III), (IV) and (V) and that the processing is effected while said color developing solution is supplied in an amount of 20 to 120 ml per 1 m.sup.2 of said silver halide color photographic material.
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: January 10, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuaki Yoshida, Takatoshi Ishikawa, Yoshihiro Fujita, Genichi Furusawa
  • Patent number: 5356759
    Abstract: A color reversal image forming process using a color reversal photographic material is disclosed. The process comprises an exposure step, a black and white development step, a reversal step, a color development step and a desilvering step. The color reversal photographic material comprises a support and one or more silver halide emulsion layers. According to one embodiment of the present invention, at least one silver halide emulsion layer comprises silver halide containing chloride of not less than 90 mole %, iodide of 0 mole % and bromide of not more than 10 mole %. According to another embodiment, at least one silver halide emulsion layer comprises silver halide containing chloride of not less than 88 mole %, iodide of 0.1 to 2 mole % and bromide of not more than 10 mole %. The silver halide emulsion layer further contains a compound represented by the formula (Ia) or (Ib): ##STR1## wherein R.sup.11 is an alkyl group, an alkenyl group, a heterocyclic group or an aryl group; X.sup.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: October 18, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akio Mitsui, Takatoshi Ishikawa
  • Patent number: 5342740
    Abstract: A method of processing an imagewise exposed silver halide color photographic material is disclosed, wherein the photographic material comprises a support having thereon a photosensitive silver halide emulsion layer containing a silver halide emulsion having a silver chloride content of at least 80 mol %. The processing method comprises the steps of color developing the photographic material in a color developing solution, and then bleach-fixing in a bleach-fixing solution, further comprising replenishing the bleach-fixing solution as the photographic material is processed by adding thereto a regenerated bleach-fixing replenisher and collecting the resulting overflow solution from the bleach-fixing tank, the regenerated bleach-fixing replenisher comprising a regenerating agent and the overflow solution from the bleach-fixing tank, and wherein the solids content of the regenerating agent is at least 70 wt % of the total weight of the regenerating agent.
    Type: Grant
    Filed: October 2, 1991
    Date of Patent: August 30, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masatoshi Goto, Takatoshi Ishikawa
  • Patent number: 5310633
    Abstract: Disclosed is a powdery bleach-fixing composition which is substantially not caked during storage. The bleach-fixing composition for color photographic materials comprises a thiosulfate, an iron (III) complex compound or a salt thereof, and a sulfite, bisulfite or pyrosulfite, at least 50 molar % (in terms of sulfite ion equivalent) thereof being potassium salt.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: May 10, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuaki Yoshida, Takatoshi Ishikawa
  • Patent number: 5273864
    Abstract: This invention provides a processing method for an exposed silver halide color photographic material, which enables cut-down of the times required for bleaching-and-fixing and for washing and yet affords a stable image excellent in color reproduction. The processing method of this invention is characterized in that the silver halide color photographic material is developed with a color developing solution substantially free of benzyl alcohol, and that the thus developed photographic material is subjected to bleaching-and-fixing for a time of not more than 70 seconds and then subjected to washing for a time of not more than 70 seconds. Another important aspect of the invention resides in the use of a magenta coupler in the processing method with a merit that a stable colored image having excellent hue is developed without the fear of formation of stains although the times for the bleaching-and-fixing and for the washing are shortened remarkedly.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: December 28, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Nobuo Sakai, Minoru Sakai
  • Patent number: 5266448
    Abstract: A method for color reversal processing of an imagewise exposed silver halide color photographic material comprising first developing in a black-and-white developing bath, next color developing in a color developing bath, and then desilvering in a bath having a bleaching ability. The black-and-white developing bath has a bromide concentration in the range of 0.025 to 0.1 mol/l and is used for the black-and-white development. Furthermore, in a preferred embodiment, the photographic material comprises at least one silver halide emulsion layer containing a silver halide emulsion comprising silver halide grains having an average grain size of 0.3 .mu.m or less. In accordance with the invention, the maximum densities of the developed color images are increased without lowering of the sensitivity and contrast.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: November 30, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Sadanobu Shuto, Takatoshi Ishikawa
  • Patent number: 5264330
    Abstract: There is disclosed a method for processing a silver halide color photographic material containing a yellow coupler represented by formula (Y) with a color developer containing an aromatic primary amine color developing agent and a polymer of vinyl alcohol or vinyl pyrrolidone series. The disclosure described provides a method for development processing wherein yellow stain and processing nonuniformity in a running processing can be prevented effectively.
    Type: Grant
    Filed: March 13, 1991
    Date of Patent: November 23, 1993
    Assignee: Fuji Photo Film Co. Ltd.
    Inventors: Kazuaki Yoshida, Takatoshi Ishikawa
  • Patent number: 5250396
    Abstract: A method of continuously processing an imagewise exposed silver halide photographic material using an automatic processor which has a color development bath, comprising the steps of a) developing with a color developer containing an organic preservative, and b) adding to the color developer during the continuous processing (i) a replenisher for the color developer containing a development agent and other components for the development in an amount of from 20 ml to 600 ml per m.sup.2 of the photographic material processed, and (ii) a water solution in an amount of from 0.1 to 1.2 times the amount of the developer which has evaporated from the bath at a frequency of about once per week or more often.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: October 5, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shinji Ueda, Takatoshi Ishikawa, Hiroshi Fujimoto
  • Patent number: 5246819
    Abstract: In accordance with the present invention a method for continuously processing a silver halide color photographic material with a color developer containing at least one aromatic primary amine color-developing agent is disclosed. The silver halide color photographic material at least one of the layers of which contains a silver halide emulsion of a high chloride comprising 80 mol % or over of silver chloride is processed, after exposure to light, with the replenishing amount of the color developer being 20 to 120 ml per m.sup.2 of the silver halide photographic material. The silver halide photographic material contains at least one of pyrazoloazole magenta couplers.
    Type: Grant
    Filed: July 25, 1991
    Date of Patent: September 21, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazuaki Yoshida, Takatoshi Ishikawa
  • Patent number: 5234801
    Abstract: A method for continuously processing an image-wise exposed silver halide color photographic material comprising the steps of color developing, bleach-fixing and at least one of washing with water and stabilizing. A replenisher is supplied to the bleach-fix bath to result in an overflow of from 30 to 500 ml/m.sup.2 of the photographic material processed. The bleach-fixing step further comprises collecting the bleach-fix overflow, regenerating the collected bleach-fix bath overflow by adding thereto a regenerant to produce a regenerated bleach-fix bath, and reusing the regenerated bleach-fix bath as a replenisher to the bleach-fix bath. The regeneration rate defined as the amount of bleach-fix overflow used for regeneration divided by the total amount of overflow multiplied by 100% is more than 80%. The photographic layers of the silver halide color photographic material have a degree of swelling of from about 2.5 to 4.0.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: August 10, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5221597
    Abstract: Disclosed is a method of processing a silver halide color photographic material where an imagewise exposed silver halide color photographic material is, after color-developed, processed with a bleaching solution contains (1,3-diamino-propanetetraacetato)iron (III) complex and that, when the material is processed with the said processing solution having a fixing ability, a jet stream of the said processing solution is run against the emulsion surface of the said photographic material. By the method, rapid desilvering is possible, and the material processed is not stained.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: June 22, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Fujita, Shinji Ueda, Takatoshi Ishikawa, Akira Abe, Shigeru Nakamura
  • Patent number: 5194368
    Abstract: The present invention relates to a method for processing a silver halide photographic light-sensitive material having at least one silver halide emulsion layer containing silver iodide with a processing solution having fixing ability after developing the light-sensitive material. The object of the present invention is to speed up the fixing process in the foregoing method and to reduce the amount of waste liquor from the fixing process. The present invention is characterized in that the processing with the processing solution having fixing ability is performed while the processing solution is brought into contact with an anion-exchange resin and that 20 to 2,000 l of the processing solution per liter of the anion-exchange resin is brought into contact with the resin.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: March 16, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shinji Ueda, Tetsuro Kojima, Tohru Kitahara, Tomokazu Yasuda, Yoshihiro Fujita, Takatoshi Ishikawa
  • Patent number: 5187051
    Abstract: There is disclosed a method for processing a silver halide photographic material comprising processing the silver halide color photographic material containing a prescribed amount of titanium oxide in an water-resistant resin layer on the silver halide color photographic material, with a color developer containing a prescribed amount of chloride ions. The disclosure described provides a method of developing processing wherein edge stain due to penetration of a developing solution from the cut end of the base is prevented and the sharpness of image is excellent.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: February 16, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5182574
    Abstract: A thermal head for a thermal-transfer or heat-sensitive printer has a silicon substrate having a projection. A porous silicon layer having a small thermal conductivity is formed on the silicon substrate so as to cover at least the projection on the silicon substrate. A heat-generating resistor layer is formed on the porous silicon oxide layer in a region above the projection of the silicon substrate. A conductor layer is formed on the heat-generating layer so as to expose the portion of the heat-generating resistor layer which is right above the projection of the silicon substrate and which serves as a heat-generating portion. The heat-generating portion and the conductor layer are covered by a protective layer.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: January 26, 1993
    Assignee: Alps Electric Co., Ltd.
    Inventors: Masakazu Kato, Takatoshi Ishikawa, Tetsuo Ishikawa
  • Patent number: 5169743
    Abstract: A method for processing a silver halide color photographic photosensitive material which comprises subjecting an imagewise exposed silver halide color photographic photosensitive material to color development process followed by bleach-fixing process and water washing and/or stabilization process. This method is characterized in that pH of the bleach-fixing solution ranges from 3.5 to 5.5 and the amount of replenished liquid for washing water and/or stabilization solution is 3 to 50 times the volume of liquid carried over from the bath preceding the water washing and/or the stabilization bath.
    Type: Grant
    Filed: May 26, 1988
    Date of Patent: December 8, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5156896
    Abstract: In the silicon substrate having porous oxidized silicon layers of this invention, which consists of a silicon substrate the one surface of which is dotted with porous oxidized silicon dots, the residual internal stress (compression stress) is dispersedly distributed in the porous oxidized silicon dots. Therefore, the entire silicon substrate having porous oxidized silicon dots of this invention is only minimally warped.Adopting a method for producing the silicon substrate of this invention which consists of covering with a mask the surface of a silicon substrate except its dotting areas to be treated, subjecting the silicon substrate to anodic formation in an aqueous hydrofluoric acid solution to form porous silicon layers in the areas to be treated and not covered with the mask and then oxidizing the formed porous silicon layers enables secured production of a silicon substrate provided with a plurality of polygonal shaped dots of porous oxidized silicon.
    Type: Grant
    Filed: July 24, 1990
    Date of Patent: October 20, 1992
    Assignee: Alps Electric Co., Ltd.
    Inventors: Masakazu Katoh, Takatoshi Ishikawa