Including Manipulative Emulsification Step Patents (Class 430/569)
  • Patent number: 6432627
    Abstract: A photothermographic element has on a support a photosensitive layer containing an emulsion of silver halide fine grains having a mean equivalent spherical diameter of 10-50 nm. (1) The silver halide emulsion has been formed independent of an organic fatty acid silver salt rather than by partial halogen conversion of a non-photosensitive organic silver salt, and mixed with the organic silver salt before coating. (2) A reducing agent for silver ion is contained. (3) The silver halide fine grains have been chemically sensitized in the presence of a spectral sensitizing dye. The element is improved in sensitivity and restrained from fog increase during storage in daylight after processing.
    Type: Grant
    Filed: April 7, 1999
    Date of Patent: August 13, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Seiji Yamashita
  • Patent number: 6413710
    Abstract: Photothermographic emulsions and materials that are highly sensitive to imaging radiation and that provide high contrast images are provided by making the emulsions with photosensitive silver halide grains that have been formed in the presence of a hydroxytetrazaindene or an N-heterocyclic compound comprising at least one mercapto group, such as a mercapto tetrazole. Such grains can then be chemically sensitized before or after mixing with an organic silver salt using a sulfur-, tellurium-containing, or gold-containing chemical sensitizing compound, or mixtures thereof.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: July 2, 2002
    Assignee: Eastman Kodak Company
    Inventors: Steven M. Shor, Chaofeng Zou, Sharon Simpson, Stacy M. Ulrich
  • Patent number: 6413709
    Abstract: A silver halide photographic material using a high-sensitivity sensitive silver halide photographic emulsion having high sensitivity in inherent absorption of silver halide grains thereof, having small inherent desensitization also in addition of a sensitizing dye and also improved in spectral sensitivity, which comprises a support having provided thereon at least one layer of a light-sensitive silver halide emulsion, in which the emulsion comprises at least a dispersing medium and silver halide grains, and 50% or more of the total projected area of the silver halide grains is occupied by grains each having therein at least one twin plane and at least one dislocation line not parallel to the twin plane.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: July 2, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Naohiro Takeda
  • Publication number: 20020081541
    Abstract: A silver halide photographic emulsion containing silver halide grains. A variation coefficient of distribution of equivalent circle diameters of all the silver halide grains of the silver halide photographic emulsion is 40 to 3%.
    Type: Application
    Filed: September 20, 2001
    Publication date: June 27, 2002
    Inventor: Makoto Kikuchi
  • Patent number: 6406821
    Abstract: A method and an apparatus for precisely controlling flow rate of reactant solution such as silver nitrate solution or halide salt solution which is added into a precipitation vessel. The method comprises applying a pressure to each source of said two solutions and controlling both said applied pressure and a flow resistance of each feed lines of said two solutions so that each flow rate of the two solutions to be added into the precipitation vessel can be adjusted to a predetermined value.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: June 18, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasunori Ichikawa, Hideharu Nagasawa, Tetsuo Nomiyama
  • Patent number: 6403294
    Abstract: A silver halide photographic material is disclosed, comprising a support having thereon at least one silver halide emulsion layer, wherein said silver halide emulsion comprises a metal complex in which a majority of coordination sites of the metal ion is occupied by ligands containing a chain or cyclic hydrocarbon as a parent compound, or ligands in which carbon atoms or hydrogen atoms in the chain or cyclic hydrocarbon as a parent compound are partially replaced by other atoms or atomic groups.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: June 11, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Tadanobu Sato
  • Patent number: 6403295
    Abstract: The present invention provides a silver halide emulsion comprising triangular tabular grains having an extremely small thickness, an extremely high aspect ratio and (111) face as a main plane. A novel silver halide photographic emulsion is provided comprising triangular tabular grains having (111) face as a main plane and a silver bromide content of 70 mol-% or more incorporated therein in a proportion of 60% or more of all silver halide grains contained therein as calculated in terms of projected area, the triangular tabular grains each having a thickness of less than 0.05 &mgr;m and an equivalent circle diameter of 0.6 &mgr;m or more as calculated in terms of circle.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: June 11, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Shigeharu Urabe
  • Publication number: 20020068247
    Abstract: A silver halide photographic emulsion comprising silver halide grains, wherein a variation coefficient of equivalent-circle diameters of all the silver halide grains is 30% or less, and 70% or more of the total projected area of the silver halide grains are occupied by silver halide grains each meeting requirements (i), (ii), and (iii) below:
    Type: Application
    Filed: September 19, 2001
    Publication date: June 6, 2002
    Inventors: Mikio Ihama, Hiroshi Kawakami, Takayoshi Mori
  • Publication number: 20020068249
    Abstract: The invention relates to a method for preparing photographic silver halide tabular grains emulsions. The method of the invention comprises a first single nucleation step wherein stable tabular seeds of silver halide are formed, and a second step wherein different batches of seeds obtained in the first step are grown to yield identical or different emulsions. This combination of steps represent a robust process for preparing tabular grain emulsions at different scales.
    Type: Application
    Filed: November 9, 2001
    Publication date: June 6, 2002
    Applicant: Eastman Kodak Company
    Inventors: Pierre-Henri Jezequel, Bruno C. Barillon, Christian S. Schmuckle
  • Publication number: 20020068248
    Abstract: A silver halide photographic emulsion is disclosed, comprising silver chloroiodide grains or silver chloroiodobromide grains, having 90 mol % or more of a silver chloride content, wherein the silver chloroiodide grains or silver chloroiodobromide grains have a layer having a silver iodide content of decreasing in the depth direction from the grain surface.
    Type: Application
    Filed: September 26, 2001
    Publication date: June 6, 2002
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Satoshi Aiba, Osamu Yonekura
  • Patent number: 6395465
    Abstract: A process for precipitating a high bromide silver halide emulsion in an aqueous medium is disclosed comprising growing nucleated silver halide grains in a reaction vessel in the presence of a peptizer comprising a water dispersable starch to form high bromide radiation-sensitive silver halide grains, wherein the majority of grain growth in the reaction vessel is performed at a pH of less than 3.5. Growth of high bromide silver halide emulsion grains in the presence of a starch peptizer at low pH in accordance with the invention results in emulsion grains with lower fog, even in the absence of the use of strong oxidizing agents during grain precipitation.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: May 28, 2002
    Assignee: Eastman Kodak Company
    Inventors: Joe E. Maskasky, Victor P. Scaccia
  • Publication number: 20020061481
    Abstract: A silver halide emulsion is disclosed, comprising tabular silver halide grains having an average iodide content of 3 to 15 mol % and comprising silver halide phases differing in halide composition, at least 50% of the total projected area of the tabular silver halide grains being accounted for by grains having an aspect ratio of not less than 12, wherein the first silver halide phase (A) has an average iodide content of not more than 3 mol % and accounting for 50 to 85% of total silver, the second phase (B) locating outside the phase (A), having an average iodide content of 8 to 25 mol % and accounting for 10 to 35% of total silver, and the third outermost phase having an average iodide content of not more than 4 mol % 0.5 to 15% of total silver.
    Type: Application
    Filed: September 6, 2001
    Publication date: May 23, 2002
    Applicant: KONICA CORPORATION
    Inventors: Hiroshi Takada, Katsuhiko Heki
  • Publication number: 20020061482
    Abstract: A silver halide photographic emulsion, wherein at least 70% of the total projected area of silver halide grains contained therein is occupied by silver bromochloroiodide hexagonal epitaxial tabular grains each having (111) faces as main planes and an epitaxial protrusion portion, wherein the epitaxial protrusion portion exists on at least one apex portion of the hexagon, and, when an average silver chloride content of the epitaxial protrusion portions of all the grains having the epitaxial protrusion portion is expressed as CL mol %, a silver chloride content of each epitaxial protrusion portion of each grain falls within the range of 0.7 CL to 1.3 CL.
    Type: Application
    Filed: September 19, 2001
    Publication date: May 23, 2002
    Inventors: Mikio Ihama, Genichi Furusawa
  • Patent number: 6391534
    Abstract: A process for precipitating a high bromide silver halide emulsion in an aqueous medium is described comprising precipitating high bromide radiation-sensitive silver halide grains in a reaction vessel in the presence of a peptizer comprising a water dispersable starch, wherein a strong oxidizing agent is added to the reaction vessel during or after the precipitation at a pH of less than 4.0 such that an oxidation potential of at least 650 mV (Ag/AgCl ref.) is achieved. A reduction in the rate of reaction between strong oxidants such as bromine and starch at such low pH has been found to enable an advantageous decrease in the amount of oxidant required to achieve and maintain a high oxidation potential during emulsion grain precipitation. Starch, unlike gelatin, also advantageously has adequate stability at the combination of high acidity and high emulsion precipitation temperatures.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: May 21, 2002
    Assignee: Eastman Kodak Company
    Inventors: Joe E. Maskasky, Victor P. Scaccia
  • Publication number: 20020058215
    Abstract: A silver halide photographic light-sensitive material is disclosed, comprising at least one silver halide emulsion characterized in that 50% or more of the projected area of all silver halide grains comprises tabular silver halide grains satisfying all of the following requirements (i) to (iii) and the coefficient of variation in the thickness of the tabular silver halide grains is less than 40%: (i) to have a grain thickness of less than 0.05 &mgr;m and an equivalent-circle diameter of 0.6 &mgr;m or more; (ii) to be silver iodobromide or silver chloroiodobromide having a silver bromide content of 70 mol% or more; (iii) to be a tabular silver halide grain having two parallel main planes comprising a (111) face.
    Type: Application
    Filed: September 26, 2001
    Publication date: May 16, 2002
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Kazutaka Takahashi, Terukazu Yanagi
  • Patent number: 6383730
    Abstract: A process for precipitating a high chloride silver halide emulsion in an aqueous medium is disclosed comprising growing nucleated silver halide grains in a reaction vessel in the presence of a peptizer comprising a water dispersable starch to form high chloride radiation-sensitive silver halide grains, wherein the majority of grain growth in the reaction vessel is performed at a pH of less than 3.5. Growth of high chloride silver halide emulsion grains in the presence of a starch peptizer at low pH in accordance with the invention results in emulsion grains with lower fog, even in the absence of the use of strong oxidizing agents and antifoggants during grain precipitation.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: May 7, 2002
    Assignee: Eastman Kodak Company
    Inventors: Joe E. Maskasky, Victor P. Scaccia
  • Publication number: 20020051949
    Abstract: A silver halide emulsion is disclosed, comprising silver halide grains having a chloride content of not less than 90 mol% and internally doped with an iridium compound (A) and a compound (B) forming a stronger electron trap than said iridium compound (A), the silver halide grains meeting the following requirement:
    Type: Application
    Filed: July 13, 2001
    Publication date: May 2, 2002
    Applicant: KONICA CORPORATION
    Inventor: Koichiro Kuroda
  • Patent number: 6376164
    Abstract: A silver halide color reversal lightsensitive material comprising a transparent support and, superimposed thereon, a blue-sensitive emulsion layer unit, a green-sensitive emulsion layer unit and a red-sensitive emulsion layer unit, each of these units comprising at least two emulsion sub-layers having the same color sensitivity but different speeds from each other, wherein the material contains a yellow dye in an amount of 0.15 to 1.0 g/m2 and satisfies the relationship: 0.9≦&ggr;′/&ggr;≦1.25 wherein &ggr; and &ggr;′ each represent a point-gamma value of a portion of the material giving a magenta density of 1.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: April 23, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuyuki Haraguchi, Katsuro Nagaoka
  • Patent number: 6372420
    Abstract: Disclosed is a method for producing a silver halide photographic emulsion comprising turning at least one of an aqueous solution of a silver salt and an aqueous solution of a halide into a linear jet stream having a high flow rate, and mixing the two kinds of solutions with each other for a short time, thereby continuously forming silver halide grains.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: April 16, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masaaki Miki, Hirokazu Saito
  • Publication number: 20020037485
    Abstract: A method has been described of preparing an ultrathin tabular grain emulsion rich in silver bromide, having {111} major faces, wherein tabular grains having a thickness of less than 0.08 &mgr;m exhibit an average aspect ratio of more than 5:1 and account for at least 75%, and more preferably at least 80%, by number of hexagonal grains and a coefficient of variation on average equivalent surface area of less than 0.50, said process comprising: introducing into a temperature-controlled reaction vessel an aqueous dispersing medium and silver, bromide, and, optionally, iodide and/or chloride, and maintaining pBr values within said reaction vessel during grain nucleation and growth that favors the formation and growth of tabular grains, characterized in that at the time said tabular grains are being formed, (a) pH in said reaction vessel is maintained at a value ranging from 0.
    Type: Application
    Filed: July 11, 2001
    Publication date: March 28, 2002
    Inventors: Kathy Elst, Ilse Mans
  • Patent number: 6352823
    Abstract: The present invention provides a silver halide photographic material free of cyanide ions but having a higher photographic speed than ever. A novel silver halide photographic material is provided comprising a support having thereon at least one silver halide emulsion layer, wherein there is contained a complex in which an organic compound having no electric charge which doesn't form coordinate bond with metals or metal ions other than the central metals or metal ions occupies more than half of the central metals or metal ions as coordination site.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: March 5, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Tadanobu Sato
  • Patent number: 6350567
    Abstract: A silver halide photographic element comprising a silver halide emulsion which is greater than 50 mole-% silver chloride, said emulsion containing an isothiazolone compound represented by the formula wherein R1 is a substituent; and Z contains the carbon atoms necessary to form a substituted or unsubstituted non-aromatic ring, wherein the isothiazolone compound was added before or during precipitation of the emulsion.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: February 26, 2002
    Assignee: Eastman Kodak Company
    Inventors: Benjamin T. Chen, Roger L. Klaus, Jeri L. Mount
  • Patent number: 6344312
    Abstract: The present application discloses a heat developable photosensitive material having on a support a non-photosensitive silver salt, a photosensitive silver halide, and a binder, which has a layer formed by coating a coating composition comprising an emulsion containing both of the photosensitive silver halide and a low molecular weight gelatin having a molecular weight of 500 to 60,000. The heat developable photosensitive material provides excellent photographic properties such as low fog, high Dmax, high sensitivity, and the like, as well as good coating surface.
    Type: Grant
    Filed: February 10, 2000
    Date of Patent: February 5, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takahiro Goto
  • Patent number: 6344311
    Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant.
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: February 5, 2002
    Assignee: Agfa-Gevaert
    Inventors: René De Keyzer, Mona Treguer, Jacqueline Belloni, Remita Hynd
  • Publication number: 20020012890
    Abstract: The invention is directed to a method for producing a silver halide photographic emulsion comprising the step of reacting a water-soluble silver salt and at least one water-soluble halide salt containing chloride or bromide in aqueous solution in the presence of an organic Grain Growth Modifier (GGM) compound, containing a halide X, which halide is not released in the form of an ion, to form light-sensitive silver halide grains having a silver halide content of a least 50 mole %, said grain growth modifier compound being water-soluble with a solubility >4 mmole per liter, and being selected from the group of compounds with an aliphatic or cyclo-aliphatic backbone R to which is attached one or more halide groups and at least one polar group.
    Type: Application
    Filed: April 24, 2001
    Publication date: January 31, 2002
    Inventor: Gertjan Bogels
  • Patent number: 6342341
    Abstract: This invention comprises a silver halide photographic element comprising at least one sensitive silver halide emulsion layer comprising silver halide grains that have been epitaxially sensitized and a fragmentable electron donor compound is of the formula X—Y′ or a compound which contains a moiety of the formula —X—Y′; wherein X is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is a proton, a base, &bgr;−, is covalently linked directly or indirectly to X, and wherein: 1) X—Y′ has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X—Y′ undergoes a bond cleavage reaction to give the radical X• and the leaving fragment Y′; and, optionally, 3) the radical X• has an oxidation potential ≦−0.7V (that is, equal to or more negative than about −0.7V).
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: January 29, 2002
    Assignee: Eastman Kodak Company
    Inventors: Kenneth J. Reed, Jerome R. Lenhard, David E. Fenton
  • Patent number: 6340562
    Abstract: A silver halide photographic emulsion, wherein silver halide grains are prepared by adding a compound capable of forming cross-linkage with gelatin to said silver halide grains in any of processes before the completion of chemical sensitization after the formation of the silver halide grains.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: January 22, 2002
    Assignee: Konica Corporation
    Inventor: Yasuo Taima
  • Publication number: 20020006590
    Abstract: A method of manufacturing a silver halide photographic emulsion, comprising a process of forming silver halide tabular grains in which 50% or more of a projected area of the total silver halide being accounted for by tabular grains having an aspect ratio of 3 or more and a equivalent-circle diameter of 1.
    Type: Application
    Filed: June 10, 1998
    Publication date: January 17, 2002
    Applicant: Ryoji Nishimura
    Inventor: RYOJI NISHIMURA
  • Patent number: 6338940
    Abstract: A silver halide photographic light sensitive material IS DISCLOSED, comprising a support having thereon a yellow dye image forming layer, a magenta dye image forming layer and a cyan dye image forming layer, wherein when the photographic material is subjected to exposure of not more than 10−3 sec. per pixel element and further to color developing to form yellow, magenta and cyan images, a variation at multiple exposure, based on non-multiple exposure, of an average gradation, which is a slope that connects two pints corresponding to densities of 0.5 and 1.5 on a characteristic curve of each of the yellow, magenta and cyan images, is not more than 10%.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: January 15, 2002
    Assignee: Konica Corporation
    Inventors: Kazuhiro Miyazawa, Junji Ito, Yumiko Nimura, Shinichi Suzuki, Makoto Kaga, Shuji Murakami
  • Publication number: 20020001784
    Abstract: A silver halide emulsion is disclosed, comprising silver halide grains of which 70% or more of the total projected area is occupied by tabular grains, said tabular grain having main surfaces of {111} face and a thickness of 0.04 &mgr;m or less and being joined with an epitaxial phase comprising silver halide containing 97 mol % or more of silver iodide.
    Type: Application
    Filed: March 23, 2001
    Publication date: January 3, 2002
    Inventor: Masashi Shirata
  • Publication number: 20010055736
    Abstract: A silver halide photographic material is disclosed, comprising a support having thereon at least one silver halide emulsion layer, wherein said silver halide emulsion comprises a metal complex in which a majority of coordination sites of the metal ion is occupied by ligands containing a chain or cyclic hydrocarbon as a parent compound, or ligands in which carbon atoms or hydrogen atoms in the chain or cyclic hydrocarbon as a parent compound are partially replaced by other atoms or atomic groups.
    Type: Application
    Filed: November 1, 1999
    Publication date: December 27, 2001
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventor: TADANOBU SATO
  • Patent number: 6329132
    Abstract: In a method of preparing a silver halide photographic emulsion by performing spectral sensitization by adding a cyanine dye during or before chemical sensitization, a substantially insoluble silver iodobromide fine-grain emulsion is added during or after chemical sensitization of the silver halide photographic emulsion.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: December 11, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Mikio Ihama
  • Patent number: 6329131
    Abstract: In a silver halide emulsion, a sum of projected areas of tabular silver halide grains, in which an outer shell region which is 40% in volume from a grain surface contains 5 mol % to 20 mol % of iodide ions with respect to a silver halide in the outer shell region, and which have a projected area diameter of 0.08 &mgr;m to 0.5 &mgr;m and an aspect ratio of 2 to 30, accounts for 80% or more of the total projected area of all grains.
    Type: Grant
    Filed: March 23, 1998
    Date of Patent: December 11, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Kimiyasu Morimura
  • Patent number: 6326135
    Abstract: This invention concerns a non-spectral sensitized radiographic product for exposure to ionizing radiation of energy equal to at least 40 keV containing at least 50 mg/dm2, which comprises a support covered with on at least one of its sides with a layer of silver halide emulsion in which at least 50% of the grains are tabular grains, and at least 0.05 mmol/mol Ag of a compound of formula wherein R1 and R2 are each independently an atom of hydrogen, an alkyl group comprising from 1 to 5 atoms of carbon, substituted or not, a hydroxyl group, or a benzyl group; R3 and R4 are each independently a hydrogen, or an alkyl group from 1 to 5 atoms of carbon, or jointly comprise the atoms necessary to form a heterocycle of 4 to 6 atoms, substituted or not. The product for industrial radiography of the invention provides an improved keeping of the latent image and higher speed.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: December 4, 2001
    Assignee: Eastman Kodak Company
    Inventors: Gerard M. Droin, Jacques Roussilhe
  • Patent number: 6326133
    Abstract: Disclosed is a silver halide photographic material comprising a silver halide emulsion layer containing at least one specific compound, with examples including compounds represented by formula (I), wherein an average aspect ratio of silver halide emulsion grains constituting said silver halide emulsion layer is from 8 to 100: wherein Z1 represents atoms completing a 5- or 6-membered nitrogen-containing heterocyclic ring, L1, L2, L3 and L4 each represent a methine group, V1 represents a monovalent substituent, l1 is an integer of from 0 to 4, p1 is 0 or 1, n1 is 0, 1, 2 or 3, R1 represents a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, M1 represents a counter ion for adjusting the electric charge balance, m1 is the number of counter ions necessary to render the molecule electrically neutral and ranges from 0 to 10, and La represents a methylene group.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: December 4, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takanori Hioki
  • Patent number: 6326134
    Abstract: A process for forming a silver halide photographic emulsion is disclosed comprising precipitating silver halide grains in an aqueous dispersing medium to which has been added silver and halide salt solutions while agitating the dispersing medium, wherein the precipitation is done in the presence of an antifoamant compound of the formula RO(CH2CH2O)nH wherein R represents an alkyl or alkenyl group containing 10 to 25 carbon atoms, or mixtures thereof, and n represents a mean value of from 2 to 4. The antifoamant material may be delivered to the aqueous dispersing medium as a small particle dispersion, made with the same peptizer used for manufacturing the emulsion or another stabilizer. A further embodiment of the invention is directed towards a silver halide photographic material comprising a support upon which is coated at least one light sensitive silver halide emulsion layer, comprising a silver halide emulsion precipitated in accordance with the described process.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: December 4, 2001
    Assignee: Eastman Kodak Company
    Inventors: Lloyd A. Lobo, Sridhar Sadasivan, John W. Boettcher, Seshadri Jagannathan, Jerzy A. Budz, David C. Gliottone
  • Patent number: 6322961
    Abstract: A color reversal photographic element is disclosed comprising a support having coated thereon a silver halide emulsion layer comprising a silver halide emulsion chemically sensitized in the presence of an organomercapto Au(I) complex having the formula [L—Au—L]M wherein M is a cationic counter ion and each L is an organomercapto ligand which has antifogging, stabilizing or sensitizing properties, and a rapid sulfiding agent represented by structure SS-1 wherein each of the R1, R2, R3, and R4 groups independently represents an alkylene, cycloalkylene, carbocyclic arylene, heterocyclic arylene, alkarylene or aralkylene group; or taken together with the nitrogen atom to which they are attached, R1 and R2 or R3 and R4 can complete a 5- to 7-membered heterocyclic ring; and each of the B1, B2, B3, and B4 groups independently is hydrogen or represents a carboxylic, sulfinic, sulfonic, hydroxamic, mercapto, sulfonamido or primary or secondary amino nucleophilic group, with th
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: November 27, 2001
    Assignee: Eastman Kodak Company
    Inventors: Wai K. Lam, Roger Lok, David W. Sandford
  • Patent number: 6322960
    Abstract: A silver halide emulsion is disclosed, containing silver halide grains having a chloride content of not less than 90 mol %, wherein the silver halide grains each are internally doped with compound (A), compound (B) and compound (C); compounds (A) and (B) each meeting specified requirements and compound (C) being an iridium compound.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: November 27, 2001
    Assignee: Konica Corporation
    Inventors: Shuji Murakami, Koichiro Kuroda, Yumiko Osawa, Junji Ito, Shinichi Suzuki
  • Publication number: 20010044082
    Abstract: A tabular silver chloride iodide or silver chloride-bromide-iodide emulsion with a chloride content of at least 90 mol %, an iodide content of 0.01 to 5 mol % and a cubic habit, which is characterized in that with respect to the projected area of all the crystals at least 80% of the crystals have an average aspect ratio of at least 8, a maximum crystal thickness distribution width of 15% and a maximum particle size distribution width of 25%, and which can be produced by a new process, wherein the supersaturation during crystal growth is adjusted within a defined range, is distinguished by high spectral sensitivity and by good stability on storage at elevated temperatures and particularly at high atmospheric humidities.
    Type: Application
    Filed: April 16, 2001
    Publication date: November 22, 2001
    Inventor: Silvia Karthauser
  • Patent number: 6319659
    Abstract: A method for preparing a silver halide emulsion comprising silver halide grains is disclosed, comprising: reacting a silver salt solution and a halide salt solution to perform silver halide grain nucleation, followed by silver halide grain growth to form the silver halide grains, wherein the silver halide grains are formed in the presence of an iodide ion releasing agent; and subjecting a reaction mixture solution to ultrafiltration during grain growth.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: November 20, 2001
    Assignee: Konica Corporation
    Inventor: Yasuo Taima
  • Patent number: 6316178
    Abstract: Disclosed is a silver halide emulsion comprising gold-sensitized silver halide grains having a silver chloride content of 95 mole % or more, wherein from 8% to 50% of the amount of gold existing on the part of the silver halide grains is in the state of metal gold. The silver halide emulsion is an emulsion having a high silver chloride content that has high sensitivity and low fogging, and reduced both high illumination intensity reciprocity law failure and regression of latent image in the initial stage after exposure.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: November 13, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Seiji Yamashita
  • Patent number: 6312882
    Abstract: A method is disclosed for preparing a light-sensitive silver halide emulsion comprising tabular grains containing colloidal silica sol as a protective colloid, said tabular grains having an average grain thickness of not more than 0.3 &mgr;m, an average aspect ratio of more than 12:1, a total projective area of said tabular grains of at least 50% and a coverage degree by silica sol particles within the range from 50 to 2000%, comprising following steps: precipitating in a reaction medium silver halide by means of a double-jet or triple-jet technique applied to aqueous solutions of silver nitrate and halide salts in colloidal silica having an average particle size in the range from 0.003 &mgr;m to 0.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: November 6, 2001
    Assignee: Agfa-Gevaert
    Inventor: Ann Verbeeck
  • Patent number: 6306569
    Abstract: A silver halide emulsion containing chemically sensitized silver halide grains, wherein the silver halide grains are prepared by ripening the grains by the addition of (1) fine silver halide grains smaller than the silver halide grains to be digested, (2) a solution containing silver ions, (3) a solution containing halide ions and a solution containing silver ions, or (4) a fine silver halide grain emulsion and a solution containing silver ions, wherein the amount of the addition in terms of silver ion is 0.05 to 8 mol % per mol of silver in the silver halide grains, and the addition is performed after 40% or more of the reaction of chalcogen sensitizer that is added during the chemical sensitization step is completed and before the silver halide grains are optimally ripened.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: October 23, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kimiyasu Morimura, Hideo Ikeda
  • Patent number: 6303284
    Abstract: A process for forming a silver halide photographic emulsion is disclosed comprising precipitating silver halide grains in an aqueous dispersing medium to which has been added silver and halide salt solutions while agitating the dispersing medium, wherein the precipitation is done in the presence of an antifoamant which comprises a hydrophobic group containing nonionic mono- or di-saccharide compound having an HLB number of between 2 and 12. The antifoamant material may be delivered to the aqueous dispersing medium as a small particle dispersion, made with the same peptizer used for manufacturing the emulsion or another stabilizer. A further embodiment of the invention is directed towards a silver halide photographic material comprising a support upon which is coated at least one light sensitive silver halide emulsion layer, comprising a silver halide emulsion precipitated in accordance with the described process.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: October 16, 2001
    Assignee: Eastman Kodak Company
    Inventors: Lloyd A. Lobo, Sridhar Sadasivan, Seshadri Jagannathan, Jerzy A. Budz, David C. Gliottone, John W. Boettcher
  • Publication number: 20010028999
    Abstract: A high velocity jet of aqueous silver salt solution through the first tubing and a high velocity jet of aqueous halide salt solution through the second tubing are forced to merge in the merging zone to induce mixing action by means of kinetic energy of the fluid in the merging zone, aqueous hydrophilic dispersant solution in the third tubing is then supplied continuously between the two high velocity jets which have already merged to mix the three solutions in the merging zone instantaneously, and the mixed solution containing silver halide particles which have been formed by reaction caused by the mixing is immediately removed out of the merging zone.
    Type: Application
    Filed: April 5, 2001
    Publication date: October 11, 2001
    Inventor: Hirokazu Saito
  • Patent number: 6300051
    Abstract: A method has been disclosed for preparing a tabular silver halide emulsion wherein tabular silver halide grains having an average aspect ratio of at least 2:1, an average crystal diameter from 0.3 &mgr;m to 3.0 &mgr;m and an average thickness of less than 0.50 &mgr;m account for at least 50% of the total projective surface area of said grains, said method comprising the steps of precipitating, spectrally sensitizing and chemically ripening said grains, characterized by spectrally sensitizing by adding to the emulsion grains before chemically ripening at least one J-band aggregating spectrally sensitizing dye and at least one non-J-band aggregating dye.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: October 9, 2001
    Assignee: Agfa-Gevaert
    Inventors: Marc Van den Zegel, Kathy Elst
  • Patent number: 6296998
    Abstract: The invention relates to an emulsion comprising bromide grains wherein said grains are chemically sensitized with a water soluble Au(I) complex having the formula [L—Au—L]M wherein the complex is symmetrical; L is an organomercapto ligand which has antifogging, stabilizing, or sensitizing properties, and M is a cationic counter ion and a rapid sulfiding agent represented by structure SS-1: wherein each of the R1, R2, R3, and R4 groups independently represents an alkylene, cycloalkylene, carbocyclic arylene, heterocyclic arylene, alkarylene or aralkylene group; or taken together with the nitrogen atom to which they are attached, R1 and R2 or R3 and R4 can complete a 5- to 7-membered heterocyclic ring; and each of the B1, B2, B3, and B4 groups independently is hydrogen or represents a carboxylic, sulfinic, sulfonic, hydroxamic, mercapto, sulfonamido or primary or secondary amino nucleophilic group, with the proviso that at least one of the B1R1 to B4R4 groups contains
    Type: Grant
    Filed: September 21, 2000
    Date of Patent: October 2, 2001
    Assignee: Eastman Kodak Company
    Inventors: Jon N. Eikenberry, Roger Lok, Robert D. Wilson
  • Patent number: 6296770
    Abstract: A method and apparatus for ultrafiltration, washing and concentration of photographic emulsion uses the Blatt Stagnant Film Theory using a gelatin-based mass transfer coefficient of the feed, gelatin concentration of the feed and a setpoint of a constant concentration at the ultrafiltration membrane wall. A useful permeate flow is achieved by varying the pump speed and membrane pressures.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: October 2, 2001
    Assignee: Eastman Kodak Company
    Inventors: Margaret B. Wilcox, William R. Gately, Raymond F. Hall
  • Patent number: 6294319
    Abstract: A method for preparing a silver halide emulsion is disclose, wherein during the course of preparing a silver halide emulsion, a compound having a group capable of releasing a bromide ion or iodide ion and represented by the following formula is used: {X—(L1)n1}n2—L2—(SOL)m wherein X represents a chlorine atom or a bromine atom; L1 and L2 each represent a bivalent linkage group; SOL represents a water-solubilizing group.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: September 25, 2001
    Assignee: Konica Corporation
    Inventors: Toshiya Kondo, Norio Miura
  • Patent number: 6291154
    Abstract: A silver halide photographic element, and a method of making such an element, comprising a tabular grain silver halide emulsion containing at least one green spectral sensitizing dye of formula I, and at least one green spectral sensitizing dye of formula II: wherein R1 and R2 may be the same or different and are selected from substituted or unsubstituted C1 or C2 alkyl, substituted or unsubstituted C1 or C2 alkoxy, halogen, substituted or unsubstituted amido, or carbamoyl or substituted or unsubstituted aryl, provided that R1 and R2 are not both aryl, and the benzo back rings may optionally be further substituted; X3 is a substituted or unsubstituted C1 to C3 alkyl or alkenyl; X1 and X2 are acid or acid salt substituted C1 to C6 alkyl or alkenyl which may be further substituted or unsubstituted; M+ is a positive ion as required to balance the charge; where R3 and R4 may be the same or different and represent substituted or unsubstituted alkyl or alkenyl of 1 to 4 c
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: September 18, 2001
    Assignee: Eastman Kodak Company
    Inventors: Anthony Adin, Frederick Charles Derks, Melvin Michael Kestner, Steven George Link