Patents by Inventor Reinhold Ruger
Reinhold Ruger 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: 7264670Abstract: Disclosed are colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, and to processes for the preparation thereof, and to the use thereof.Type: GrantFiled: December 9, 2004Date of Patent: September 4, 2007Assignee: Merck Patent GesellschaftInventors: Reinhold Rüger, Kersten Dittmar, Johann Dietz, Ralf Tischer
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Publication number: 20050120917Abstract: Disclosed are coloured flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, and to processes for the preparation thereof, and to the use thereof.Type: ApplicationFiled: December 9, 2004Publication date: June 9, 2005Inventors: Reinhold Ruger, Kersten Dittmar, Johann Dietz, Ralf Tischer
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Patent number: 6218070Abstract: A process to make ultrahigh contrast photographic negative images is disclosed. In known processes, particularly those using hydrazine compounds, developer solutions to increase contrast contain high concentrations of amino compounds that are volatile, have an annoying, unwholesome odor, and corrode the development machines. If development is conducted in the presence of onium compounds having both quaternary nitrogen and tertiary amine functions in the molecule, the process can operate with odor-free developers that do not release corrosive vapors. The invention can be used in reprography for steps preliminary to printing.Type: GrantFiled: March 10, 1994Date of Patent: April 17, 2001Assignee: Agfa-Gevaert, N.V.Inventor: Reinhold Rüger
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Patent number: 6150083Abstract: It was found that good sensitizing activity in the red spectral region and without residual stain can be obtained with dyes of the general formula (I) ##STR1## wherein R.sub.1 is an alkyl group having 1 to 6 carbon atoms or a heterocyclic ring, R.sub.2 and R.sub.3 are hydrogen, methyl, or methoxy, but at least one of the groups R.sub.2 and R.sub.3 is not hydrogen, R.sub.4 and R.sub.5 are alkyl groups having 1 to 6 carbon atoms that can be substituted with hydroxyl groups, and X.sup.- is an anion.The invention can be used for preparing silver images, for example, for reproduction in preprint operations for black and white or multicolor printing.Type: GrantFiled: November 5, 1997Date of Patent: November 21, 2000Assignee: Agfa-Gevaert, N.V.Inventors: Francois Varescon, Reinhold Ruger
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Patent number: 6033825Abstract: Photographic silver-halide materials for producing negative images with ultrahard-gradation contrast, which contain a hydrazine compound and a contrast-boosting amino compound and/or phosphonium compound, demonstrate a marked tendency to form "black fog" which results in inadequate acutance. By adding 200 to 2500 mg per mol of silver of a polyvinyl lactam to the emulsion, the fog is inhibited and acutance is improved without reducing sensitivity. The invention can be used to produce images during reproduction in the pre-printing stage.Type: GrantFiled: October 29, 1998Date of Patent: March 7, 2000Assignee: Agfa-Gevaert NVInventors: Reinhold Ruger, Fran.cedilla.ois Varescon
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Patent number: 6030744Abstract: Photographic silver-halide materials for producing negatives with ultrahard-gradation gamma contrast, which contain a hydrazine compound and a contrast-boosting amino compound and/or phosphonium compound, demonstrate an undesirable increase in fog during storage. By adding a sulphite salt to the emulsion, storage-stable materials are obtained in which sensitivity and contrast are increased. The invention can be used to produce images during reproduction in the pre-printing stage.Type: GrantFiled: October 29, 1998Date of Patent: February 29, 2000Assignee: Agfa-Gevaert NVInventors: Reinhold Ruger, Fran.cedilla.ois Varescon
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Patent number: 5783357Abstract: Silver halide recording material for the production of negative images with ultrahigh contrast.Known silver halide recording materials for the production of negative images with ultrahigh contrast contain hydrazine compounds and contrast-increasing compounds (so-called boosters). A material with a new class of such boosters is being presented here, whereby they contain a sulfonyl urea, sulfonyl urethane or sulfuryl diamide group as well as a tertiary amino group in the molecule. The invention also comprises a process for the production of black-and-white negative images with ultrahigh contrast using the material according to the invention. It is especially useful for reproduction in the pre-press stage.Type: GrantFiled: March 15, 1996Date of Patent: July 21, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Reinhold Ruger
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Patent number: 5663034Abstract: Silver halide recording material for making negative images having ultrahigh contrast.Known silver halide recording materials for making negative images having ultrahigh contrast contain hydrazine compounds and contrast enhancing compounds (so-called boosters). The invention involves a material having a new class of such a booster, containing in its molecule at least one nitrile group and a tertiary amino group. The invention also includes a process for making black-and-white negative images having ultrahigh contrast by using the invention's materials. The invention is particularly useful in the pre-press stage for printing.Type: GrantFiled: April 16, 1996Date of Patent: September 2, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventor: Reinhold Ruger
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Patent number: 5637439Abstract: Negative images of super-high contrast can be formed by developing an exposed silver halide photographic photosensitive material in the presence of at least one compound selected from the compound of formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent a hydrogen atom, an alkyl group, an aryl group or a heterocyclic group, R.sup.1 and R.sup.2, R.sup.3 and R.sup.4, R.sup.5 and R.sup.6, or R.sup.1 and R.sup.3, together with nitrogen atom to which they are attached, may form a ring; L.sup.1 and L.sup.2 independently represent an alkylene group, an arylene group or a repeated alkyleneoxy group having at least two repeated alkyleneoxy units, which groups may be optionally substituted; A represents an atom selected from hydrogen, carbon, nitrogen, oxygen and sulfur or a divalent linkage group constituted from these atoms; and m and n represent 0 or 1, and the compound of formula (2) ##STR2## wherein R.sup.7, R.sup.8 and R.sup.Type: GrantFiled: November 2, 1995Date of Patent: June 10, 1997Assignees: Mitsubishi Paper Mills Ltd., E. I. Du Pont de Nemours and CompanyInventors: Satoshi Kaneko, Kenji Hirata, Akira Tanaka, Reinhold Ruger
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Patent number: 5416218Abstract: Photographic silver halide materials containing aryl hydrazides as defined and novel aryl hydrazides with a cationic group in the acyl radical enables the preparation of photographic materials that can be developed rapidly to ultrahigh contrast at a relatively low pH value. The photographic materials are useful in reprography, particularly screening for halftone images.Type: GrantFiled: January 13, 1993Date of Patent: May 16, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Dominic M. Chan, Reinhold Ruger
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Patent number: 5407792Abstract: The present invention relates to photosensitive silver halide recording material with reduced pressure sensitivity. The occurrence of pressure marks can be minimized by protective layers with suitable additives. Other properties of the recording material, such as sensitivity, contrast, and clarity, are not affected adversely. Recording materials with protective layers containing polyolefin oxidates are largely insensitive to pressure marks and have low haze, high sensitivity, and high contrast. The invention's recording materials can be used in all fields of photographic and radiographic image production, especially in reproducing color images in steps preliminary to printing and in recording x-ray images for medical diagnostics.Type: GrantFiled: March 30, 1994Date of Patent: April 18, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: Reinhold Ruger
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Patent number: 5190847Abstract: Photographic silver halide materials containing aryl hydrazides as defined and novel aryl hydrazides with a cationic group in the acyl radical enables the preparation of photographic materials that can be developed rapidly to ultrahigh contrast at a relatively low pH value. The photographic materials are useful in reprography, particularly screening for halftone images.Type: GrantFiled: February 20, 1991Date of Patent: March 2, 1993Assignee: E. I. du Pont de Nemours and CompanyInventors: Dominic M. Chan, Reinhold Ruger
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Patent number: 5130480Abstract: Photographic silver halide elements containing aryl hydrazides as defined for the production of images with ultrahigh contrast and a new class of aryl hydrazides with a cationic group in the aryl radical as defined. The photographic silver halide elements can be developed at relatively low pH values and have low fog and low tendency to form black spots in unexposed or slightly exposed areas.Type: GrantFiled: January 30, 1991Date of Patent: July 14, 1992Assignee: E. I. du Pont de Nemours and CompanyInventor: Reinhold Ruger
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Patent number: 5013844Abstract: Photographic silver halide elements containing aryl hydrazides as defined for the production of images with ultrahigh contrast and a new class of aryl hydrazides with a cationic group in the aryl radical as defined. The photographic silver halide elements can be developed at relatively low pH values and have low fog and low tendency to form black spots in unexposed or slightly exposed areas.Type: GrantFiled: December 15, 1989Date of Patent: May 7, 1991Assignee: E. I. Du Pont de Nemours and CompanyInventor: Reinhold Ruger
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Patent number: 4937160Abstract: Photographic silver halide elements containing aryl hydrazides as defined for the production of images with ultrahigh contrast and a new class of aryl hydrazides with a cationic group in the aryl radical as defined. The photographic silver halide elements can be developed at relatively low pH values and have low fog and low tendency to form black spots in unexposed or slightly exposed areas.Type: GrantFiled: August 14, 1989Date of Patent: June 26, 1990Assignee: E. I. Du Pont de Nemours and CompanyInventor: Reinhold Ruger