Direct Positive Material Patents (Class 430/940)
  • Patent number: 4749644
    Abstract: In a light-sensitive direct posi silver halide color photographic material having photographic constituent layers comprising at least one silver halide emulsion layer containing latent image type silver halide grains not previously fogged, which is capable of giving a direct posi image by subjecting the whole surface to exposure or effecting surface development in the presence of a fogging agent, after image exposure, the improvement wherein said internal latent image type silver halide grains are composed of at least two groups of internal latent image type silver halide grains having average grain sizes different from each other, and at least one compound capable of releasing a development inhibiting substance or its precursor through the reaction with the oxidized product of a color developing agent is contained in at least one layer of said photographic constituent layers.
    Type: Grant
    Filed: June 18, 1986
    Date of Patent: June 7, 1988
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yasuo Tosaka, Keiji Ogi, Atsushi Kamitakahara
  • Patent number: 4704349
    Abstract: Photographic direct-positive emulsions with silver halide crystals of layered structure are prepared.The silver halide crystals of these emulsions can form a latent internal image and are superficially converted to silver iodide. Normal surface developers are suitable for developing.
    Type: Grant
    Filed: March 18, 1987
    Date of Patent: November 3, 1987
    Assignee: Ciba-Geigy AG
    Inventor: Arnd Kriebel
  • Patent number: 4670375
    Abstract: Disclosed is a light-sensitive silver halide color photographic material comprising a support and a plurality of silver halide emulsion layers on the support, the emulsion layers being substantially identical in color sensitivity but different in sensitivity and containing at least one of a dye image-forming coupler, characterized in that silver halide grains contained in at least one layer of the plurality of silver halide emulsion layers consist substantially of monodispersed silver halide grains, a color concentration of the emulsion layer comprising the monodispersed silver halide grains being within the range of 60 to 98% of the total color concentration of the plurality of silver halide emulsion layers.The employment of the monodispersed silver halide grains of this invention and the increase in a concentration of the grains in the emulsion layers permit the improvement of graininess, the enlargment of exposure range and better of stability to processing and stability with time.
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: June 2, 1987
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Kenji Michiue, Toshihiko Yagi, Katsumasa Yamazaki, Sohei Goto, Yoshiharu Mochizuki
  • Patent number: 4643965
    Abstract: A direct positive photographic light-sensitive material is described, comprising a support and at least one internal latent image type silver halide emulsion layer containing core/shell type silver halide grains which are composed of a silver halide core subjected to at least one of doping with metal ions and chemical sensitization, and a silver halide shell covering at least sensitivity sites of said core, and a binder, wherein said core/shell type silver halide grains consist of two or more kinds of grains each having a different average grain size, and the core of the core/shell type silver halide grains having a larger average grain size is doped with a larger amount of lead ions, cadmium ions, or Group VIII metal ions.
    Type: Grant
    Filed: May 24, 1984
    Date of Patent: February 17, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Satosi Kubota, Tetsuo Yoshida, Hideki Ohmatsu
  • Patent number: 4639416
    Abstract: An internal latent image-type silver halide emulsion containing core/shell type silver halide grains with a mean grain size of about 0.4 .mu.m or less, the grains comprising a core of chemically sensitized silver halide and a shell of silver halide covering at least the light-sensitive sites of the core and the surface of the grains being chemically sensitized wherein the core is chemically sensitized to such an extent that the difference between fog density F.sub.1 and fog density F.sub.2 as defined herein (i.e., internal fog density) is at least 0.10. This emulsion permits the formation of good reversal images in which D.sub.max is high and D.sub.min is low and, furthermore, has a superior storage stability.
    Type: Grant
    Filed: May 11, 1984
    Date of Patent: January 27, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tetsuo Yoshida, Tadayoshi Kokubo
  • Patent number: 4636457
    Abstract: Direct positive photographic elements are disclosed employing internal latent image silver halide emulsions associated with developer autoxidation promoter agents constituted by 5 or 6 membered nucleus-containing heterocyclic compounds comprising an azomethine group, whose methine group is substituted with a 5-amino-1,2,4-triazolyl group, and/or copper complex compounds thereof.Preferably said direct positive photographic elements are multi-layer elements comprising internal latent image type type silver halide emulsion layers sensitized to different regions of the visible light and associated with image-dye providing compounds (photographic color couplers).
    Type: Grant
    Filed: July 15, 1985
    Date of Patent: January 13, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Luigi Valbusa, Enzo Coraluppi, Andrea Quaglia, Mario Tavella
  • Patent number: 4629678
    Abstract: An internal latent image-type direct positive silver halide light-sensitive material is described, comprising a support having at least one photographic emulsion layer thereon, wherein said layer contains internal latent image-type direct positive silver halide grains, the surfaces of which are chemically sensitized, wherein a compound of the general formula (I) is added as a finish additive to the photographic emulsion layer or at least one hydrophilic colloid layer adjacent to the photographic emulsion layer.General Formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are defined as herein. The light-sensitive material exhibits a very satisfactory reversal performance and is greatly improved in stability over the course of time.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: December 16, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Ashita Murai
  • Patent number: 4613563
    Abstract: A silver halide photographic light-sensitive material comprising a support having provided thereon at least one internal latent image type direct positive silver halide emulsion layer is disclosed, wherein(1) said internal latent image type direct positive silver halide emulsion layer comprises at least two layers having substantially the same color sensitivity, or(2) at least said internal latent image type direct positive silver halide emulsion and a solid pigment-containing layer contiguous thereto, which is positioned on the side opposite to the side of the silver halide emulsion layer to be exposed, are provided,and wherein at least one internal latent image type direct positive silver halide emulsion in (1) or (2) has a binder/silver halide (calculated as silver) ratio by weight of more than 1.25.
    Type: Grant
    Filed: January 29, 1985
    Date of Patent: September 23, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Ashita Murai
  • Patent number: 4610959
    Abstract: A direct positive silver halide photographic material is described, comprising a support having thereon at least an internal latent image-type direct positive silver halide emulsion layer containing a hydrazine series nucleating agent, wherein said silver halide emulsion layer or a layer adjacent to the silver halide emulsion layer contains a non-dye image-forming compound represented by following general formula (I) in an amount sufficient for accelerating nucleation; ##STR1## wherein Z.sub.1 and Z.sub.2, which may be the same or different, each represents an atomic group necessary for forming a benzene ring or a naphthalene ring; G.sub.1 and G.sub.2, which may be the same or different, each represents hydrogen or a substituent which does not adversely influence the image; A.sub.1, A.sub.2 and A.sub.3, which may be the same or different, each represents hydrogen or a substituent which does not adversely influence the image; B.sub.1, B.sub.2 and B.sub.
    Type: Grant
    Filed: February 20, 1985
    Date of Patent: September 9, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigetoshi Ono, Shigeru Nakamura, Kazuhiko Matsumoto
  • Patent number: 4591549
    Abstract: Improved process for preparing silver chlorobromide or silver chloroiodobromide emulsion wherein first silver ion solution and second halide ion solution are mixed by double jet method and mole % of silver bromide, silver chloride and silver iodide are in specified range, characterized in that molar ratio of Br.sup.- :Cl.sup.- :I.sup.- in second solution is within specified range and further step is included to produce silver halide with control of silver ion concentration by using third solution containing Br.sup.- and Cl.sup.-. Such emulsions have sufficiently narrow grain diameter distribution and silver halide composition distribution, with constant productivity.
    Type: Grant
    Filed: September 14, 1984
    Date of Patent: May 27, 1986
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Syoji Matsuzaka, Makoto Kajiwara, Masanobu Miyoshi, Kiyoshi Yamashita
  • Patent number: 4582779
    Abstract: A previously unfogged internal latent image-type direct positive silver halide emulsion and a photographic material incorporating such emulsion are described, wherein the emulsion contains at least one sensitizing dye represented by formula (I): ##STR1## wherein one of R.sup.1 and R.sup.2 represents a sulfoalkyl group and the other thereof represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, or a pyridyl group; X represents a sulfur atom or an oxygen atom; Y represents a sulfur atom, an oxygen atom, or ##STR2## wherein R represents a lower alkyl group or --CH.sub.2).sub.n.sbsb.1 O--CH.sub.2).sub.n.sbsb.2 OH, wherein n.sub.1 and n.sub.2 each represents an integer of 1 to 4; and W represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, or an unsubstituted or substituted phenyl group.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: April 15, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Satosi Kubota, Tadao Sugimoto
  • Patent number: 4581328
    Abstract: An internal latent image core/shell silver halide photographic emulsion containing core/shell silver halide grains is disclosed, the grains comprising a silver halide core which is doped with a metal ion or chemically sensitized or is both doped with a metal ion and chemically sensitized, and a silver halide shell which covers at least a sensitivity speck of the core, wherein both added iodine ion and a polymer having a specific repeating unit described in the specification are present on the surface of the core/shell silver halide grains. The emulsion has a high sensitivity even without chemical sensitization of the surface of core/shell silver halide grains.
    Type: Grant
    Filed: November 16, 1984
    Date of Patent: April 8, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Junichi Matsuyama
  • Patent number: 4576905
    Abstract: Compounds containing an aromatic ring portion fused with a tellurazolium or derivative tellurazole, tellurazoline (including tellurazolinylidene), or tellurazolinium ring portion are disclosed together with processes and intermediates for their preparation. With properly selected pendant groups these tellurazolium and derivative compounds can be usefully employed as dyes, antifoggants or stabilizers, nucleating agents, latent image keeping addenda, or speed or contrast altering addenda in silver halide photographic systems.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: March 18, 1986
    Assignee: Eastman Kodak Company
    Inventors: Wolfgang H. H. Gunther, Ronald E. Leone, Rosemary Przyklek
  • Patent number: 4572892
    Abstract: A black and white direct positive photographic element intended for the formation of a viewable silver image is disclosed. One or more silver halide emulsion layers are present containing internal latent image forming silver halide grains. A maximum density enhancing antifoggant is located in an undercoat between the emulsion layer or layers and the support to impart an increase in photographic speed, an extended overexposure margin before encountering rereversal, a decrease in minimum density, and an increase in the covering power of developed silver.
    Type: Grant
    Filed: June 6, 1985
    Date of Patent: February 25, 1986
    Assignee: Eastman Kodak Company
    Inventor: Harry A. Hoyen
  • Patent number: 4571380
    Abstract: An inner latent image type silver halide photographic emulsion which is spectrally sensitized by adding at least one cyanine dye represented by general formula (II) to a direct positive inner latent image type silver halide photographic emulsion and thereafter adding additionally at least one cyanine dye represented by general formula (I) to said emulsion ##STR1## (the symbols are as defined in the appended claims). A remarkable increase of spectral sensitivity, an increase of maximum density and a decrease of minimum density can be obtained by this silver halide photographic emulsion.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: February 18, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuhiro Noguchi, Yuji Mihara
  • Patent number: 4550070
    Abstract: Direct positive silver halide photographic light-sensitive materials are described in which at least one layer of light-sensitive silver halide photographic emulsion layers and other hydrophilic colloid layers applied on a base contains a mercapto compound represented by the following general formula (I) or (II) as a nucleating agent: ##STR1## wherein Z, L.sub.1, L.sub.2, L.sub.3, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and m are as defined in the specification. The nucleating agents can also be added to processing solutions.
    Type: Grant
    Filed: April 27, 1984
    Date of Patent: October 29, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tsutomu Miyasaka, Hidetoshi Kobayashi, Isamu Itoh, Shigeo Hirano
  • Patent number: 4539291
    Abstract: A direct positive silver halide material is disclosed. The material is comprised of a support base having a silver halide emulsion layer thereon which contains at least one phenazine series compound represented by the general formula (I), (II) or (III) and at least one compound represented by the general formula (IV), (V) or (VI). The structural formulae are shown within the specification wherein their substituents are defined. By including one compound of each of these groups within the material the resulting material provides images with a reduced minimum density without reducing the contrast of the images formed.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: September 3, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuaki Inoue, Hiroyuki Mifune, Koki Nakamura
  • Patent number: 4529689
    Abstract: Improved heat developable silver films are produced upon coating and drying a binder composition containing (a) a substantially light-insensitive silver sulfinate, (b) a silver halide photocatalyst, and (c) a developer. A preferred film contains (a) silver hexadecylsulfinate, (b) a separately sensitized silver halide emulsion and (c) a Phenidone or Dimezone moiety in a coalesced latex binder.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: July 16, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ross A. Lee
  • Patent number: 4521508
    Abstract: A silver halide photographic light-sensitive material is disclosed. The material is comprised of a support base having thereon a silver halide emulsion layer and a protective layer. The material contains a photosensitive silver halide emulsion and inside fogged silver halide emulsion as well as a disulfide compound. The disulfide compound is a compound represented by the general formula (I):A--S--S--B (I)wherein A and B independently represent an alkyl group, an aralkyl group, an aryl group, a heterocyclic group or ##STR1## wherein R represents an alkyl group, an aryl group, an aralkyl group, a heterocyclic group or an amino group. The material can form images having high contrast and a high maximum density. Further, the material has high sensitivity to light and can be developed at a low temperature in a reduced amount of time.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: June 4, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadao Sugimoto, Hideo Ikeda, Hiroyuki Mifune, Koki Nakamura
  • Patent number: 4518689
    Abstract: An inner latent image type silver halide photographic emulsion which is spectrally sensitized by adding at least one monomethine cyanine dye represented by general formula (II) to a direct positive inner latent image type silver halide photographic emulsion and thereafter adding additionally at least one monomethine cyanine dye represented by general formula (I) to said emulsion ##STR1## (the symbols are as defined in the appended claims). A remarkable increase of spectral sensitivity, an increase of maximum density and a decrease of minimum density can be obtained by this silver halide photographic emulsion.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: May 21, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuhiro Noguchi, Yuji Mihara
  • Patent number: 4504570
    Abstract: High aspect ratio tabular grain direct reversal silver halide emulsions are disclosed. The emulsions can be incorporated in photographic elements, such as multicolor photographic elements. Image transfer film units incorporating these direct reversal emulsions are specifically disclosed.
    Type: Grant
    Filed: December 23, 1983
    Date of Patent: March 12, 1985
    Assignee: Eastman Kodak Company
    Inventors: Francis J. Evans, Richard L. Daubendiek, Ronald G. Raleigh
  • Patent number: 4495274
    Abstract: Direct positive silver halide photographic materials comprising a support, a silver halide emulsion layer comprising fogged silver halide particles prepared in the presence of a water soluble iridium salt or a water soluble rhodium salt, and a hydrophilic colloidal layer comprising (a) a compound selected from Formula I and II and (b) at least one compound selected from the group consisting of Formula III and a gold compound, said Formula I being ##STR1## wherein R.sub.1 is hydrogen, alkyl, --SO.sub.3 M, or --COOM, wherein M is selected from hydrogen, alkali metals, and ammonium, and R.sub.2 is selected from hydrogen and lower alkyls, said Formula II being ##STR2## wherein R.sub.3 is selected from hydrogen, alkyl, --SO.sub.3 M, and --COOM, and R.sub.4 is selected from hydrogen, alkyl, and --CH.sub.2 --S--(CH.sub.2).sub.n --Y', wherein n is an integer of from 1 to 3, and Y' is selected from hydrogen and --SO.sub.3 M, and said Formula III beingH.sub.2 N--Y--NH--Y].sub.m NH.sub.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: January 22, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventor: Kazuhiro Yoshida
  • Patent number: 4482627
    Abstract: A direct positive silver halide sensitive material and a method of treating the material are disclosed. The method of treatment comprises providing an exposed direct positive silver halide sensitive material comprised of a base having thereon a compound represented by the general formula (I) and a sensitive silver halide photographic emulsion layer. The material is then developed in the presence of a compound represented by the general formula (II). ##STR1## the substituents within the general formula are defined in the specification. ##STR2## the substituents within this general formula are also defined in the specification. The use of the compounds represented by the general formulae (I) and (II) provide an image with improved sharpness and edge effect. Furthermore, the process can be carried out without substantial variations in the reversal property due to variations in the bromine ion concentration of the developing solution or the pH thereof.
    Type: Grant
    Filed: April 14, 1983
    Date of Patent: November 13, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Takagi, Shigeo Hirano, Tadao Sugimoto
  • Patent number: 4481285
    Abstract: A method of treating a direct positive silver halide sensitive material is disclosed. The material is comprised of a base having thereon a compound represented by the general formula (I), a sensitive silver halide photographic emulsion layer and a hydrophilic colloid layer. The exposed material is developed in the presence of the compound represented by the general formula (II) ##STR1## wherein R.sup.1 and R.sup.2 independently represent a hydrogen atom, an aliphatic residue, an aromatic residue or a heterocyclic residue, R.sup.3 represents a hydrogen atom or an aliphatic residue, R.sup.4 represents a hydrogen atom, an aliphatic residue or an aromatic residue, and X represents a divalent aromatic residue; ##STR2## wherein R.sup.1 and R.sup.2 represent each a hydrogen atom or an aliphatic residue, and R.sup.1 and R.sup.2 may form a ring by linking together, R.sup.
    Type: Grant
    Filed: April 14, 1983
    Date of Patent: November 6, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Takagi, Shigeo Hirano, Tadao Sugimoto
  • Patent number: 4444871
    Abstract: Method for forming a direct positive-color image in which an imagewise exposure is applied to a direct positive silver halide color photosensitive material comprising a support and at least one light-sensitive silver halide emulsion layer which contain internal latent image type silver halide grains whose surfaces are not fogged, said method including applying a fogging exposure and color development wherein said fogging exposure is applied in a wet condition with a solution containing at least one fluorescent whitening agent.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: April 24, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Kazuyoshi Miyaoka, Shigeharu Koboshi
  • Patent number: 4444874
    Abstract: Photographic elements particularly adapted for forming direct-positive images are disclosed in which a radiation-sensitive core-shell emulsion layer and a silver halide emulsion layer incapable of forming a surface latent image within the direct-positive exposure latitude of the first emulsion layer and containing a grain population capable of internally trapping photolytically generated electrons are both present. The photographic elements are capable of exhibiting increased covering power, greater maximum density, and increased speed.
    Type: Grant
    Filed: September 15, 1982
    Date of Patent: April 24, 1984
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Silverman, Harry A. Hoyen
  • Patent number: 4444865
    Abstract: Blended emulsions for use in forming a direct-positive image are disclosed. The emulsions are comprised of a first, radiation-sensitive core-shell grain population having a relatively low coefficient of variation and a second, substantially smaller size grain population capable of internally trapping photolytically generated electrons. Photographic elements incorporating the blended emulsions exhibit improved covering power and can exhibit enhanced speed.
    Type: Grant
    Filed: September 15, 1982
    Date of Patent: April 24, 1984
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Silverman, Harry A. Hoyen
  • Patent number: 4440851
    Abstract: A method for obtaining direct positive images wherein a photographic material having a support and at least two silver halide emulsion layers coated thereon, each layer having a different spectral sensitivity, said emulsions being of the internal latent image type and containing unfogged silver halide crystals, is imagewise exposed and then subjected to an overall area exposure prior to or during the development thereof to form the image. The overall area exposure is such that the photographic intensity ratios between various layers are not more than 6 and the intensity of such overall exposure has a value between light intensities which give 0.8 times the maximum image density of the particular emulsion layer and 10 times that light intensity value.
    Type: Grant
    Filed: October 12, 1982
    Date of Patent: April 3, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yasuo Tosaka, Keiji Ogi
  • Patent number: 4435491
    Abstract: A process for the production of lithographic printing plates, and a light-sensitive material for use in the process are described. The light-sensitive material comprises an electrically conductive support having a hydrophilic surface, and a positive type light-sensitive layer and a photoconductive insulative layer on the support, wherein the positive type light-sensitive layer and the photoconductive insulative layer are provided on the support as a unit layer or individually in that order, and the photoconductive insulative layer can be charged either positively or negatively. The desired lithographic printing plate can be prepared by treating the light-sensitive material by the simple process of the invention.
    Type: Grant
    Filed: November 25, 1981
    Date of Patent: March 6, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takashi Kitamura, Hiroshi Kokado
  • Patent number: 4433050
    Abstract: A direct positive type light sensitive silver halide photographic material is disclosed. At least one layer containing an unfogged internal latent image type silver halide emulsion, is provided on a support, and an internal latent image type silver halide emulsion having fog centers in silver halide grains, is incorporated in said layer or in another constituent layer of the photographic material. A dye image forming substance may be incorporated in the same layer or in a separate layer to form a color diffusion transfer type light sensitive photograhic material. The photographic materials present a positive image having a high maximum density and a low minimum density.
    Type: Grant
    Filed: September 9, 1981
    Date of Patent: February 21, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Takao Abe, Satoru Hohnishi
  • Patent number: 4433047
    Abstract: Photographic elements particularly adapted for forming direct-positive images are disclosed in which a radiation-sensitive core-shell emulsion layer and a silver halide emulsion layer incapable of forming a surface latent image within the direct-positive exposure latitude of the first emulsion layer and containing a grain population capable of internally trapping photolytically generated electrons are both present. The photographic elements are capable of exhibiting increased covering power, greater maximum density, and increased speed.
    Type: Grant
    Filed: September 15, 1982
    Date of Patent: February 21, 1984
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Silverman, Harry A. Hoyen
  • Patent number: 4431730
    Abstract: A process for the preparation of an internal latent image type silver halide emulsion containing silver halide grains comprising a central core of silver halide doped with metal ions, chemically sensitized or a combination thereof and an outer shell of silver halide covering at least light-sensitive sites of the central core characterized in that the surface of the silver halide grains are chemically sensitized in the presence of a polymer containing the repeating unit represented by general formula (I) ##STR1## wherein symbols R.sup.1 and Q are defined in the specification.
    Type: Grant
    Filed: February 17, 1982
    Date of Patent: February 14, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeharu Urabe, Shinji Sakaguchi, Ichizo Toya, Tadao Sugimoto
  • Patent number: 4431731
    Abstract: An internal latent image silver halide emulsion is disclosed comprising core/shell silver halide particles having a chemically sensitized surface which are composed of a core of silver halide doped with metal ions and/or subjected to chemical sensitization and a shell which covers said core as far as to do at least the sensitive sites of said core and a binder, wherein said silver halide emulsions contain a polymer containing a repeating unit represented by the following general formula (I) in an amount of 2 mg to 1000 mg per mole of silver as the weight of said repeating units in said polymer: ##STR1## wherein R.sup.1 represents a hydrogen atom or an alkyl group and Q represents a group selected from the group consisting of the following (1)-(4): ##STR2## wherein q represents an integer of 2 to 4, ##STR3## wherein R.sup.2 and R.sup.3 each represents a hydrogen atom or an alkyl group, ##STR4## wherein Z.sup.
    Type: Grant
    Filed: February 17, 1982
    Date of Patent: February 14, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadao Sugimoto, Ichizo Toya, Shigeharu Urabe, Shinji Sakaguchi
  • Patent number: 4401754
    Abstract: A silver halide photographic emulsion characterized in that it comprises silver halide grains which are reduction-sensitized during the process of growing said grains and containing a compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group and a cycloalkyl group and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an acyl group, a carboxyl group, an aldehyde group, an amino group, a sulfo group, an alkylthio group, an acylamino group, an aryloxy group, an arylthio group, an alkylamino group, an alkoxycabonyl group and a sulfonamide group. The emulsion exhibits both high sensitivity and improved stability as compared with prior art compositions.
    Type: Grant
    Filed: October 30, 1981
    Date of Patent: August 30, 1983
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Akio Suzuki, Hiroaki Shiozawa, Takeo Koitabashi, Hideki Takiguchi
  • Patent number: 4395478
    Abstract: A radiation-sensitive emulsion for use in forming a direct-positive image is disclosed. The emulsion is comprised of core-shell silver halide grains. The shell portions of the grains contain polyvalent metal ions to reduce rereversal.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: July 26, 1983
    Assignee: Eastman Kodak Company
    Inventor: Harry A. Hoyen
  • Patent number: 4276369
    Abstract: The present invention relates to a method for forming ultra fine patterns on films of polymethyl isopropenyl ketone or a mixture of polymethyl isopropenyl ketone and a benzophenone compound by exposing such films to ultra violet rays in the range of from 1,000 to 3,500 A. The present invention is particularly useful for providing semiconductors having ultra fine patterns and ultra LSI's. The electric or electronic circuits for electronic or electric apparatus and equipment have been produced by wiring resistors, condensers, coils, vacuum tubes and the like necessary components. However, because of various disadvantages such as assembly requiring much time, complication of work, necessity of using large equipment, reasons or causes for errors, limitation of productivity, impossibility of reducing price or cost and the like, the present invention has been developed for printed circuit boards.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: June 30, 1981
    Assignee: Tokyo Ohka Kogyo Kabushiki Kaisha
    Inventors: Minoru Tsuda, Yoichi Nakamura
  • Patent number: RE32097
    Abstract: Blended emulsions for use in forming a direct-positive image are disclosed. The emulsions are comprised of a first, radiation-sensitive core-shell grain population having a relatively low coefficient of variation and a second, substantially smaller size grain population capable of .Iadd.internally forming a latent image by .Iaddend.internally trapping photolytically generated electrons. Photographic elements incorporating the blended emulsions exhibit improved covering power and can exhibit enhanced speed.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: March 25, 1986
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Silverman, Harry A. Hoyen
  • Patent number: RE32149
    Abstract: Photographic elements particularly adapted for forming direct-positive images are disclosed in which a radiation-sensitive core-shell emulsion layer and a silver halide emulsion layer incapable of forming a surface latent image within the direct-positive exposure latitude of the first emulsion layer and containing a grain population capable of internally .Iadd.forming a latent image by internally .Iaddend.trapping photolytically generated electrons are both present. The photographic elements are capable of exhibiting increased covering power, greater maximum density, and increased speed.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: May 20, 1986
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Silverman, Harry A. Hoyen