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: 6144476
    Abstract: An image display device having a scanning device for scanning light from a light source and for projecting a virtual image on a pupil of a viewer. The scanning device has a first mirror and a second mirror that scan the light in a same direction.
    Type: Grant
    Filed: October 27, 1998
    Date of Patent: November 7, 2000
    Assignee: Minolta Co., Ltd.
    Inventors: Yasushi Tanijiri, Takatoshi Ishikawa, Kenji Ishibashi
  • Patent number: 6096488
    Abstract: Processing a silver halide color photographic material comprising color developing, desilvering and water washing and/or stabilizing. In this process, a photographic material which has at least one emulsion layer containing a high silver chloride content, and at least one emulsion layer containing a monodisperse emulsion, is continuously processed with a color developing solution containing a water-soluble high polymer compound. The coated amount of silver in the photographic material is preferably 0.75 g/m.sup.2 or less. The color developing solution preferably has a chloride ion content of 0.035 mol/l or more. The water soluble high polymer compound can be a polyester, polyamide, polyurethane, polyether, polycarbonate or a natural high polymer compound, or their derivatives. It is obtained by polymerizing or copolymerizing a monomer containing a copolymerizable ethylene type unsaturated group. The high polymer compound is preferably added in the amount of 0.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: August 1, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Kazuaki Yoshida, Hiroshi Fujimoto, Junichi Yamanouchi, Tomokazu Yasuda
  • Patent number: 5922519
    Abstract: A method for processing a silver halide color photographic photosensitive material comprises the steps of desilverizing a photosensitive silver halide material having at least one red-sensitive layer, green-sensitive layer and blue-sensitive layer respectively on one side of a transparent support and a magnetic recording layer containing magnetic grains on the other side after the color development and then washing it with water and/or stabilizing it, wherein a bath having fixing function used in the desilverization step contains the following compound or analogue thereof. ##STR1## This method does not impair the S/N ratio of the magnetically recorded information and excellent desilverization effect can be obtained.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: July 13, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Masaru Yoshikawa, Tetsuro Kojima
  • Patent number: 5911490
    Abstract: An overhead projector provides an unobstructed view of projected images by minimizing the vertical dimension of the projector and provides sufficient brightness of projected images by minimizing the loss of light. The light emitted from a light source housed in the body of the projector is reflected by a first reflection mirror and directed, through a transparent stage on which a transparent original is placed, to a second reflection mirror. Meanwhile, on the transparent stage, the principal ray axis of the light beam forms an angle .theta. with respect to the center axis of the surface of the transparent original. After reaching the second reflection mirror and being reflected thereby, the light is condensed into a projection lens unit, and is projected therefrom onto a screen to form thereon an image of the transparent original.
    Type: Grant
    Filed: August 29, 1997
    Date of Patent: June 15, 1999
    Assignee: Minolta Co., Ltd.
    Inventors: Takatoshi Ishikawa, Soh Ohzawa
  • Patent number: 5814436
    Abstract: The present invention provides a processing method which allows a silver halide color photographic material to be sufficiently desilvered and minimizes the rise in the formation of bleaching fog or stain even when it is processed in a short period of time. A novel process for the processing of a silver halide color photographic material comprising at least silver halide emulsion layer on a support which comprises subjecting the silver halide color photographic material to color development, and then processing the silver halide color photographic material with a processing solution having a bleaching capacity is provided, characterized in that said emulsion layer comprises tabular silver halide grains having ?100! major faces and a silver chloride content of 50 to 100 mol % and said processing solution having a bleaching capacity contains at least one ferric complex salt of a compound represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: September 29, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5795703
    Abstract: A method for processing silver halide photosensitive photographic material comprises the steps of developing an image-exposed silver halide photosensitive material and desilvering it with a processing solution having fixing function which contains a thiosulfate radical and a specified meso-ionic compound or a specified thiourea, an amount of ammonium ion in the solution being 0 to 50% based on the total counter cations in the solution. This method can provide processed silver halide photosensitive photographic material having excellent photographic properties while keeping a low stain concentration with even a small amount of a replenisher.
    Type: Grant
    Filed: December 10, 1996
    Date of Patent: August 18, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5753424
    Abstract: In a process for processing a silver halide color photosensitive material having a transparent substrate each possessing at least one red-sensitive layer, at least one green-sensitive layer, and at least one blue-sensitive layer and containing ferromagnetic fine powder, when a salt content in the final bath is not more than 7000 ppm in the processing stages of water washing and/or stabilization after the color development and desilvering, the deterioration in an S/N ratio of a magnetically recorded information can be drastically improved.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: May 19, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5752122
    Abstract: A color photographic processing apparatus in which a color film processing apparatus, a printer and a color paper processing apparatus are installed in a casing is provided. The sum of a length of a path from an entrance of a developing tank to a discharge port of a drying station of the color film processing apparatus and a length of a path from an entrance of a developing tank to a discharge port of a drying station of the color paper processing apparatus is in the range of 950 mm to 10,000 mm. The time from insertion of a film into the color film processing apparatus to discharge of 25th print is less than 10 minutes. The values of the ratio given by the following equation are from 120 to 330 for the color film, and from 20 to 120 for the color paper;length of path (mm)/conveying speed (mm/sec.).
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: May 12, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5683161
    Abstract: A projecting optical device which simultaneously projects one object onto two or more different screens has a first screen, a second screen, a first projecting optical system which projects the object onto the first screen, and a second projecting optical system which projects the object onto the second screen and does not share an optical element with the first projecting optical system. A first base line connecting the center of the object to the center of the image projected on the first screen by the first optical system and a second base line connecting the center of the object to the center of the image projected on the second screen by the second optical system are not parallel to each other.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: November 4, 1997
    Assignee: Minolta Co., Ltd.
    Inventors: Takatoshi Ishikawa, Soh Ohzawa, Katsuhiro Takamoto
  • Patent number: 5669031
    Abstract: An apparatus for processing a photographic sensitive material capable of accurately controlling photographic characteristics and processing solutions. If exposures of images recorded on a negative film have been integrated, for a predetermined number of frames a mean exposure is calculated and a result of comparison thereof with a reference exposure is supplied to the film processor. The result of the comparison is used to control the processing performance of the film processor. A density meter measures the densities of an exposed portion and a non-exposed portion of a color paper processed in a processor portion. As physical quantities affecting the photographic characteristics, the throughput of color paper per unit period, temperature, pH, specific gravity and electric conductivity of processing solutions, quantity of replenishment of replenisher to be replenished to the processing solutions and quantity of water to be added to the processing solutions are detected.
    Type: Grant
    Filed: June 11, 1996
    Date of Patent: September 16, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Fumio Mogi
  • Patent number: 5660973
    Abstract: A developing machine having a high durability at a high temperature even in the presence of a high concentration of the developing agent is provided. The developing machine has means for keeping the temperature of a color developer having a concentration of an aromatic primary amine developing agent of 0.15 to 0.50 mol/l in the range of 40.degree. to 50.degree. C., and the material for at least one of the developing tanks and the racks is a resin selected from the group consisting of polyphenylene sulfide resin, polyphenylene oxide resin, polymethylpentene resin, polyether ether ketone resin, polyalkylene terephthalate resin, polyether imide resin, polyether sulfone resin and polysulfone resin.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: August 26, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Fumio Mogi
  • Patent number: 5619742
    Abstract: A photographic processing condition managing method applied to an image forming device equipped with a function for immersing a photosensitive material for photographing into a processing solution for photosensitive materials for photographing so as to process the photosensitive material for photographing.
    Type: Grant
    Filed: November 15, 1995
    Date of Patent: April 8, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuo Matsumoto, Takaaki Terashita, Fumio Mogi, Noboru Sasaki, Takatoshi Ishikawa
  • Patent number: 5619743
    Abstract: A photographic processing apparatus efficiently processes color photographic film and color printing paper. Intermediate portions of pipes for circulating processing solutions which communicate with a bleaching tank, first and second fixing tanks, a wash tank and first and second stabilizing bath tanks of a film processing section, and a bleaching/fixing tank and first through third rinsing tanks of a printing paper processing section penetrate a metal block of a cast heater so that the pipes are coupled together by the metal block for efficient heat transmission. A heater is provided inside the metal block to uniformly heat the processing solutions which flow through the pipes.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 8, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Fumio Mogi, Takatoshi Ishikawa
  • Patent number: 5611077
    Abstract: A processing apparatus for color photographic photosensitive materials comprises (a) processing tanks comprising a color developing tank, a desilvering tank, a washing tank and/or a stabilizing tank, (b) means for replenishing respective processing tanks, (c) means for controlling an amount of replenishing color developing solution to be charged into the color developing tank in such that an amount of overflow liquid from the color developing tank is at most 400 ml per m.sup.2 of the processed color photographic photosensitive materials, (d) one storage tank for collecting overflow liquids from all of the processing tanks and (e) means for introducing all overflow liquids from the processing tanks into the storage tank. This apparatus is small-size and has only one waste liquid tank with a low cost and a stable capacity without reducing efficiency of recovering silver and generating ammonia gas.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: March 11, 1997
    Assignee: Fuji Photo FIlm Co., Ltd.
    Inventors: Takatoshi Ishikawa, Fumio Mogi
  • Patent number: 5607819
    Abstract: There is disclosed a color developer and a method for processing a silver halide color photographic material using said color developer. The color developer comprises a thiourea compound represented by the formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted cycloalkylene group, provided that two or more of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each do not represent a hydrogen atom at the same time; at least one pair of R.sub.1 and R.sub.3, and R.sub.2 and R.sub.4, together may bond to form a nitrogen-containing heterocyclic ring; or at least one pair of R.sub.1 and R.sub.2, and R.sub.3 and R.sub.4, together may bond to form a ring.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: March 4, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5595860
    Abstract: A process for processing a silver halide color photographic material, which comprises developing in a color developer substantially free of sulfite ion and containing an aromatic primary amine color developing agent and at least one phosphorus compound selected from the group consisting of compounds represented by formula (I), formula (I-a) and formula (I-b) and internal salts thereof: ##STR1## wherein R, R' and R" each represents an aliphatic hydrocarbon group or an aryl group; A represents a divalent or trivalent linking group; M, M' and M" each represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium or a quaternary ammonium; and m represents 2 when M, M' or M" is monovalent and m is 1 when M, M' and M" is divalent.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: January 21, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Masakazu Yoneyama
  • Patent number: 5573893
    Abstract: There is disclosed a method for processing a silver halide color photographic material. The method comprises processing a silver halide color photographic material having a photographic layer, the degree of swelling of which is 1.2 to 3.0, by a color developer containing at least one compound represented by formula (I) in an amount of 0.01 to 10 g per liter of said color developer. ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represent a hydrogen atom, or an alkyl group, an alkoxy group, or an alkenyl group, which may be substituted, n is an integer of 1 to 3, and M represents a hydrogen atom or a counter cation.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: November 12, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Fujimoto, Takatoshi Ishikawa, Kazuaki Yoshida
  • Patent number: 5574016
    Abstract: The present invention concerns glycoprotein IIa/IIIb antagonists and platelet aggregation inhibitors of the formula (I): ##STR1## wherein R.sup.1 is aryl which may have one or more suitable substituent(s),R.sup.2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl,R.sup.3 is carboxy or protected carboxy,A.sup.1 is alkylene which may have one or more suitable substituent(s),A.sup.2 is a group of the formula: ##STR2## (wherein R is lower alkyl), or a group of the formula:--NHCH.sub.2 CH.sub.2 CO--,A.sup.3 is lower alkylene which may have one or more suitable substituent(s),l, m and n are each the same or different an integer of 0 or 1,with proviso that A.sup.2 is not a group of the formula:--NHCH.sub.2 CH.sub.2 CO--,when l is an integer of 0.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: November 12, 1996
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Hisashi Takasugi, Akito Tanaka, Hiroyoshi Sakai, Takatoshi Ishikawa
  • Patent number: 5534394
    Abstract: A method for processing a silver halide color photographic material with which edge staining and the occurrence of staining on aging after processing can be prevented, and with which the stability of the bleach-fixer can be improved, comprising color developing and bleach-fixing the photographic material, wherein the bleach-fixer contains (1) thiosulfate, (2) at least one type of compound selected from among the group of compounds represented by formulae (I) and (II): ##STR1## wherein Ra, Rb, R.sup.1 through R.sup.4, X.sup.1 and n are as defined in the specification, and (3) an adduct of bisulfite with at least one type of compound selected from among the group of compounds represented by formulae (A), (B), (C) and (D): ##STR2## wherein R.sub.1 through R.sub.11, X, Y, Z, m and n are as defined in the specification.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: July 9, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Shinji Ueda, Hirotomo Sasaki, Tetsuro Kojima
  • Patent number: 5480628
    Abstract: There is disclosed a color developer and a method for processing a silver halide color photographic material with said color developer. The color developer comprises a water-soluble silicone compound, preferably at least one water-soluble silicone compound represented by the following formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, which may be the same or different, each represent a substituent or a linking group; at least one of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 represents a water-soluble group; A represents a bivalent group; and n is an integer of 0 to 10.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: January 2, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Masakazu Yoneyama