Patents by Inventor Dirk J. Hasberg
Dirk J. Hasberg 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).
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Patent number: 7008748Abstract: Thermally developable materials such as thermographic and photothermographic materials include a co-precipitate comprising first and second organic silver salts, the first organic silver salt comprising a silver salt of a nitrogen-containing heterocyclic compound containing an imino group, and the second organic silver salt comprising a silver salt of a mercaptotriazole. The first organic silver salt can be used in the imaging process as a source of reducible silver ions, and the second organic silver salt can be a source of a toning agent. The co-precipitate can be prepared using double-jet precipitation techniques to provide an aqueous dispersion that can be used in imaging formulations.Type: GrantFiled: September 7, 2004Date of Patent: March 7, 2006Assignee: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Doreen C. Lynch, Kui Chen-Ho, Chaofeng Zou
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Patent number: 7008761Abstract: A process for the preparation of a radiation-sensitive silver halide emulsion comprised of high bromide cubical silver halide grains, the process comprising: (a) providing in a stirred reaction vessel a dispersing medium and high bromide silver halide grain cores, the grain cores comprising at least 5 mole % of the final emulsion silver and the contents of the vessel being maintained at a temperature of at least about 65° C., and (b) precipitating a high bromide silver halide shell which comprises at least 5 mole % of the final emulsion silver onto the grain cores by introducing at least a silver salt solution into the dispersing medium at a specified high rate, wherein a minor percentage of chloride ions, relative to bromide, is introduced into the reaction vessel prior to or concurrent with precipitation of the high bromide shell, and wherein the concentration of silver halide grains in the reaction vessel at the end of the precipitation of the shell is at least 0.5 mole/L.Type: GrantFiled: March 31, 2004Date of Patent: March 7, 2006Assignee: Eastman Kodak CompanyInventor: Dirk J. Hasberg
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Patent number: 6977139Abstract: Thermally developable materials such as thermographic and photothermographic materials include a novel non-photosensitive source of reducible silver ions that are predominantly provided as rod-shaped particles of silver salt of a nitrogen-containing heterocyclic compound containing an imino group. The rod-shaped particles have an average aspect ratio of at least 3:1 and a width index for particle diameter of 1.25 or less, and provide improved imaging properties. These particles can be prepared using double jet precipitation procedures in which vAg is kept constant at a value of equal to or greater than ?50 mV.Type: GrantFiled: April 16, 2004Date of Patent: December 20, 2005Assignee: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Chaofeng Zou
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Patent number: 6753134Abstract: A process for the preparation of a radiation-sensitive silver halide emulsion comprised of high bromide cubical silver halide grains is described, the process comprising: (a) providing in a stirred reaction vessel a dispersing medium and high bromide silver halide seed grains, the seed grains comprising at least 5 mole % of the final emulsion silver, and (b) precipitating a silver halide shell which comprises at least 5 mole % of the final emulsion silver onto the seed grains by introducing at least a silver salt solution into the dispersing medium at a rate such that the normalized shell molar addition rate, Rs, is above 1.Type: GrantFiled: July 24, 2002Date of Patent: June 22, 2004Assignee: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Rajesh V. Mehta, Ralph W. Jones, Jr
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Patent number: 6750002Abstract: A process for preparing a concentrated photographic spectral sensitizing dye-water composition which comprises adding an anionic sensitizing dye to an aqueous medium in the substantial absence of organic solvent, and agitating the combined dye and aqueous medium, wherein the anionic dye forms a liquid-crystalline dye phase in the aqueous medium and the agitation is performed in the presence of a nonionic surfactant having an HLB of less than 12 and an aqueous solubility at 25° C. of greater than 10 ppm, which nonionic surfactant is in the aqueous medium at a level of from 10 to 1000 ppm. In a specific embodiment of the invention, where the viscosity (at 0.1 s−1 shear rate) of the dye-water composition in the absence of the nonionic surfactant would be greater than 100 cp and especially where such viscosity would be greater than 500 cp, the surfactant is preferably present at a level sufficient to substantially reduce air entrainment during agitation of the dye-water composition.Type: GrantFiled: January 28, 2002Date of Patent: June 15, 2004Assignee: Eastman Kodak CompanyInventors: James E. Novak, Jeffrey S. Baugher, Dirk J. Hasberg, Lloyd A. Lobo
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Publication number: 20040018456Abstract: A process for the preparation of a radiation-sensitive silver halide emulsion comprised of high bromide cubical silver halide grains is described, the process comprising: (a) providing in a stirred reaction vessel a dispersing medium and high bromide silver halide seed grains, the seed grains comprising at least 5 mole % of the final emulsion silver, and (b) precipitating a silver halide shell which comprises at least 5 mole % of the final emulsion silver onto the seed grains by introducing at least a silver salt solution into the dispersing medium at a rate such that the normalized shell molar addition rate, Rs, is above 1.Type: ApplicationFiled: July 24, 2002Publication date: January 29, 2004Applicant: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Rajesh V. Mehta, Ralph W. Jones
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Patent number: 6623918Abstract: A process for the preparation of a radiation-sensitive silver halide emulsion comprised of high bromide tabular silver halide grains is described, the process comprising: (a) providing in a stirred reaction vessel a dispersing medium and high bromide silver halide tabular seed grains, the seed grains comprising at least 5 mole % of the final emulsion silver, and (b) precipitating a silver halide shell which comprises at least 5 mole % of the final emulsion silver onto the seed grains by introducing at least a silver salt solution into the dispersing medium at a rate such that the normalized shell molar addition rate, Rs, is above 1.Type: GrantFiled: May 29, 2002Date of Patent: September 23, 2003Assignee: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Ralph W. Jones, Jr., Rajesh V. Mehta
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Publication number: 20030175629Abstract: A process for preparing a concentrated photographic spectral sensitizing dye-water composition which comprises adding an anionic sensitizing dye to an aqueous medium in the substantial absence of organic solvent, and agitating the combined dye and aqueous medium, wherein the anionic dye forms a liquid-crystalline dye phase in the aqueous medium and the agitation is performed in the presence of a nonionic surfactant having an HLB of less than 12 and an aqueous solubility at 25° C. of greater than 10 ppm, which nonionic surfactant is in the aqueous medium at a level of from 10 to 1000 ppm. In a specific embodiment of the invention, where the viscosity (at 0.1 s−1 shear rate) of the dye-water composition in the absence of the nonionic surfactant would be greater than 100 cp and especially where such viscosity would be greater than 500 cp, the surfactant is preferably present at a level sufficient to substantially reduce air entrainment during agitation of the dye-water composition.Type: ApplicationFiled: January 28, 2002Publication date: September 18, 2003Applicant: Eastman Kodak CompanyInventors: James E. Novak, Jeffrey S. Baugher, Dirk J. Hasberg, Lloyd A. Lobo
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Patent number: 6513965Abstract: An apparatus and method for mixing at least two reactants is taught wherein a first reactant is delivered to a reaction zone through a first annular flow path and a second reactant is delivered to the reaction zone through a second annular flow path. The first and second annular flow paths are concentric with one another and the two reactants intermix with one another in the reaction zone. There is a rotating disc having a surface, defining one boundary of the reaction zone. The flow of the first and second reactants across the rotating disc and through the reaction zone is generally radial and has a residence time in the reaction zone of not more than about 100 msec, and preferably not more than about 50 msec. The reaction zone resides in a main reactor vessel and there is a driven agitator residing in the main reactor vessel to stir the contents thereof.Type: GrantFiled: November 6, 2001Date of Patent: February 4, 2003Assignee: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Rajesh V. Mehta, Michael Bryan, Ramesh Jagannathan
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Patent number: 6443611Abstract: An apparatus and method for mixing at least two reactants is taught wherein a first reactant is delivered to a reaction zone through a first annular flow path and a second reactant is delivered to the reaction zone through a second annular flow path. The first and second annular flow paths are concentric with one another and the two reactants intermix with one another in the reaction zone. There is a rotating disc having a surface, defining one boundary of the reaction zone. The flow of the first and second reactants across the rotating disc and through the reaction zone is generally radial and has a residence time in the reaction zone of not more than about 100 msec, and preferably not more than about 50 msec. The reaction zone resides in a main reactor vessel and there is a driven agitator residing in the main reactor vessel to stir the contents thereof.Type: GrantFiled: December 15, 2000Date of Patent: September 3, 2002Assignee: Eastman Kodak CompanyInventors: Dirk J. Hasberg, Rajesh V. Mehta, Michael Bryan, Ramesh Jagannathan
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Publication number: 20020101783Abstract: An apparatus and method for mixing at least two reactants is taught wherein a first reactant is delivered to a reaction zone through a first annular flow path and a second reactant is delivered to the reaction zone through a second annular flow path. The first and second annular flow paths are concentric with one another and the two reactants intermix with one another in the reaction zone. There is a rotating disc having a surface, defining one boundary of the reaction zone. The flow of the first and second reactants across the rotating disc and through the reaction zone is generally radial and has a residence time in the reaction zone of not more than about 100 msec, and preferably not more than about 50 msec. The reaction zone resides in a main reactor vessel and there is a driven agitator residing in the main reactor vessel to stir the contents thereof.Type: ApplicationFiled: December 15, 2000Publication date: August 1, 2002Inventors: Dirk J. Hasberg, Rajesh V. Mehta, Michael Bryan, Ramesh Jagannathan
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Publication number: 20020101782Abstract: An apparatus and method for mixing at least two reactants is taught wherein a first reactant is delivered to a reaction zone through a first annular flow path and a second reactant is delivered to the reaction zone through a second annular flow path. The first and second annular flow paths are concentric with one another and the two reactants intermix with one another in the reaction zone. There is a rotating disc having a surface, defining one boundary of the reaction zone. The flow of the first and second reactants across the rotating disc and through the reaction zone is generally radial and has a residence time in the reaction zone of not more than about 100 msec, and preferably not more than about 50 msec. The reaction zone resides in a main reactor vessel and there is a driven agitator residing in the main reactor vessel to stir the contents thereof.Type: ApplicationFiled: November 6, 2001Publication date: August 1, 2002Inventors: Dirk J. Hasberg, Rajesh V. Mehta, Michael Bryan, Ramesh Jagannathan