Patents by Inventor Marc Van den Zegel
Marc Van den Zegel 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: 6733947Abstract: A single-side coated silver halide photographic film material has been disclosed, said film material comprising a support, at least one light-sensitive emulsion layer and a substantially light-insensitive protective hydrophilic colloid layer farther away from said support than said emulsion layer, wherein said emulsion layer contains a silver halide emulsion rich in silver bromide with cubic crystals having an average numerical diameter in the range from 0.4 up to 0.Type: GrantFiled: June 30, 2003Date of Patent: May 11, 2004Assignee: Agfa-GevaertInventors: Leo De Bie, Johan Loccufier, Ludo Joly, Marc Van den Zegel, Paul Callant
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Publication number: 20040009423Abstract: A single-side coated silver halide photographic film material has been disclosed, said film material comprising a support, at least one light-sensitive emulsion layer and a substantially light-insensitive protective hydrophilic colloid layer farther away from said support than said emulsion layer, wherein said emulsion layer contains a silver halide emulsion rich in silver bromide with cubic crystals having an average numerical diameter in the range from 0.4 up to 0.Type: ApplicationFiled: June 30, 2003Publication date: January 15, 2004Inventors: Leo De Bie, Johan Loccufier, Ludo Joly, Marc Van den Zegel, Paul Callant
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Patent number: 6630278Abstract: A system has been disclosed for use in radiographic industrial non-destructive testing materials and personal monitoring, making use therefor, of tabular silver brom(oiod)ide emulsion grains having {111} major faces, an average equivalent circular diameter of at least 0.5 &mgr;m and an average thickness of less than 0.30 &mgr;m, having been chemically sensitized by the steps of adding at least a gold salt in order to provide the surface of said tabular grains with at least 6000 atoms of gold per &mgr;m2 of its grain surface and per (0.1 &mgr;m of thickness)2; and at least a sulfite salt in such an amount that the ratio of the number of gold atoms per &mgr;m2 and (concentration of said sulfite salt, expressed in mmole per mole of silver)2 is at least 200000.Type: GrantFiled: September 19, 2001Date of Patent: October 7, 2003Assignee: AGFA-GevaertInventors: Marc Van den Zegel, Marleen De Vester
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Patent number: 6573019Abstract: A radiographic film material has been described for recording medical diagnostic images of soft tissue through exposure to light, emitted by a single intensifying screen, after having been subjecting to exposure with X-rays, emitted from an X-ray generating device with a tube voltage of 20 kV to 40 kV, and processing, including development, fixing and drying, within a time of 120 (and more preferably 90) seconds or less, wherein said film is comprised of a transparent film support, front and back major faces and an image-forming portion for providing, when imagewise exposed by light emitted by said intensifying screen and processed, an average contrast or gradient in the range from 3.0 up to 4.5, measured over a density above fog in the range of from 0.25 to 2.Type: GrantFiled: March 18, 2002Date of Patent: June 3, 2003Assignee: Agfa-GevaertInventors: Marc Van den Zegel, Francis Vanhoudt
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Patent number: 6528227Abstract: A direct X-ray system for industrial radiography like non-destructive testing applications, and personal monitoring, being particularly less sensitive to pressure phenomena, has been disclosed, said system consisting of a direct X-ray black-and-white negative-working radiographic film material, comprised of a transparent support coated on at least one side thereof with a tabular grain emulsion layer, substantially free from spectrally sensitizing dyes, in which at least 50 percent of total grain projected area of all grains is accounted for by silver bromoiodide tabular grains having an iodide content of less than 5 mole %, based on silver, having an average aspect ratio of at least 2, and having a volume greater than 0.Type: GrantFiled: September 19, 2001Date of Patent: March 4, 2003Assignee: Agfa-GevaertInventors: Marc Van den Zegel, Marleen De Vester
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Publication number: 20020076640Abstract: A direct X-ray system for industrial radiography, like non-destructive testing applications, and personal monitoring, being particularly less sensitive to pressure phenomena, has been disclosed, said system consisting of a direct X-ray black-and-white negative-working radiographic film material, comprised of a transparent support coated on at least one side thereof with a tabular grain emulsion layer, substantially free from spectrally sensitizing dyes, in which at least 50 percent of total grain projected area of all grains is accounted for by silver bromoiodide tabular grains having an iodide content of less than 5 mole %, based on silver, having an average aspect ratio of at least 2, and having a volume greater than 0.Type: ApplicationFiled: September 19, 2001Publication date: June 20, 2002Inventors: Marc Van Den Zegel, Marleen De Vester
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Publication number: 20020064725Abstract: A system has been disclosed for use in radiographic industrial non-destructive testing materials and personal monitoring, making use therefor, of tabular silver brom(oiod)ide emulsion grains having {111} major faces, an average equivalent circular diameter of at least 0.5 &mgr;m and an average thickness of less than 0.30 &mgr;m, having been chemically sensitized by the steps of adding at least a gold salt in order to provide the surface of said tabular grains with at least 6000 atoms of gold per &mgr;m2 of its grain surface and per (0.1 &mgr;m of thickness)2; and at least a sulfite salt in such an amount that the ratio of the number of gold atoms per &mgr;m2 and (concentration of said sulfite salt, expressed in mmole per mole of silver)2 is at least 200000.Type: ApplicationFiled: September 19, 2001Publication date: May 30, 2002Inventors: Marc Van Den Zegel, Marleen De Vester
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Publication number: 20020018954Abstract: A single-side coated light-sensitive silver halide photographic film material has been disclosed, having on one side of a subbed support, one or more light-sensitive silver halide emulsion layer(s) overcoated with an outermost protective layer; and, at the other side of said support, a backing layer, covered with a protective outermost layer, characterized in that at least said backing layer is provided with a layer wherein, besides a cross-linked or cross-linkable first binder an organic component free from cross-linking upon reaction with a hardener is present as a second binder having a low molecular weight.Type: ApplicationFiled: April 10, 2001Publication date: February 14, 2002Inventors: Marc Van den Zegel, Francis Vanhoudt, Frank Ruttens, Guy Damen
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Patent number: 6316175Abstract: A silver halide photographic material has been provided, having in a layer arrangement at one or both sides of a subbed support, corresponding with a single-side coated or a double-side coated material respectively, one or more layer(s) comprising a light-sensitive silver halide emulsion, one or more protective antistress layer(s) and, optionally, an outermost afterlayer, wherein at least one of said layers, subbing layer(s) inclusive, further comprises means in order to provide, when conditioned at a relative humidity of at most 30%, an electrical resistance, measured as described in Research Disclosure June 1992, item 33840, of from 4×109 &OHgr;/sq. up to 5×1010 &OHgr;/sq. for the layer having the lowest resistance.Type: GrantFiled: February 22, 2000Date of Patent: November 13, 2001Assignee: Agfa-GevaertInventors: Marc Van den Zegel, Etienne Van Thillo, Bavo Muys
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Patent number: 6300051Abstract: 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: GrantFiled: March 18, 1999Date of Patent: October 9, 2001Assignee: Agfa-GevaertInventors: Marc Van den Zegel, Kathy Elst
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Patent number: 6280915Abstract: A silver halide coated photographic material is disclosed comprising sensitized silver bromide or silver bromoiodide tabular grains having an average thickness of less than 0.30 &mgr;m, in at least one light-sensitive layer and which is characterised in that it further contains in the said light-sensitive layer and/or at least one non-light sensitive layer at least one polyoxyethylene compound comprising from about 20 to 100 mole percent recurring units of the formula (Ia) and 80 to 0 mole % recurring units of the formula and wherein R represents an aliphatic, aromatic, or heterocyclic group, and X represents a halogen.Type: GrantFiled: June 29, 1994Date of Patent: August 28, 2001Assignee: Agfa-GevaertInventors: Marc Van den Zegel, Jan Claes, Jean-Marie Dewanckele
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Patent number: 6218094Abstract: A light-sensitive silver halide photographic material has been provided comprising a support and on one or both sides thereof at least one light-sensitive silver halide emulsion layer, a gelatinous protective antistress layer and, adjacent thereto as an outermost layer, a gelatinous afterlayer characterized in that said afterlayer comprises at least one polymer latex, being a polybutylacrylate, a polybutylmethacrylate latex or a polyurethane latex, or a copolymer latex being a copolymer poly(butyl methacrylate) polyacrylamide N-substituted sulfo-isobutyl salt, in a ratio amount by weight of (co)polymer latex to gelatin from 0.2:1 up to 5:1 and a total amount of (co)polymer latex and gelatin of at least 0.10 g/m2.Type: GrantFiled: September 29, 1999Date of Patent: April 17, 2001Assignee: Agfa-GevaertInventors: Marc Van den Zegel, Hubert Vandenabeele, Eddy Michiels, Frank Louwet
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Patent number: 5811229Abstract: An image-forming film-screen system for medical diagnostic imaging is disclosed comprising a light-sensitive silver halide photographic film material in operative association with at least one intensifying screen comprising on a support a layer of a visible light emitting luminescent phosphor, the said film material comprising a support and on at least one side thereof a light-sensitive silver halide emulsion layer having spectrally sensitized tabular silver halide and a non-light-sensitive protective layer, wherein said protective layer contains a polymeric compound selected from the group consisting of gelatin, a synthetic, semi-synthetic or natural substitute for gelatin and latex (co)polymers, in an amount of at least 0.4 g per m.sup.2 ; characterized in that between a light-sensitive silver halide emulsion layer and said protective layer there is an intermediate layer comprising a blue colored pigment in dispersed form, having a solubility in isopropanol at 25.degree. C. of less than 10 mg per liter.Type: GrantFiled: January 22, 1997Date of Patent: September 22, 1998Assignee: AGFA-Gevaert, N.V.Inventor: Marc Van den Zegel
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Patent number: 5693370Abstract: A method is described to provide a radiographic silver halide material by coating on at least one side of a support, covered with a hydrophobic subbing layer comprising as a latex copolymer vinylidene chloride, methylacrylate and itaconic acid, following hydrophilic layers: at least one gelatinous dye containing layer comprising one or more dyes, at least one silver halide emulsion layer, at least one protective antistress layer, and optionally an afterlayer, characterized in that said hydrophilic layers have a swelling ratio of not more than 200% and in that said hydrophilic layers are coated simultaneously by the slide-hopper coating or by the slide-hopper curtain coating technique.Type: GrantFiled: June 27, 1996Date of Patent: December 2, 1997Assignee: Agfa-Gevaert, N.V.Inventor: Marc Van den Zegel
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Patent number: 5595864Abstract: A photographic material has been coated on at least one side of a support with in at least one photosensitive layer hexagonal and/or circular tabular silver halide emulsion crystals occupying at least 70% of the total projected area of all grains, having a thickness of 0.15 to 0.30 .mu.m, a coefficient of variation of the tabular grains between 0.15 and 0.45 and an average aspect ratio of at least 2:1, prepared in the absence of ammonia by growing the nuclei, prepared at a pBr value between 1.0 and 2.0 and consuming less than 10% by weight of silver nitrate, during a first growth step at a pBr value between 1.0 and 2.5 consuming at least 10% by weight of silver nitrate and during a second growth step at a pBr value higher than 2.7 during the addition of at least 40% of the total amount of silver nitrate used.Type: GrantFiled: July 13, 1994Date of Patent: January 21, 1997Assignee: Agfa-Gevaert, N.V.Inventors: Marc Van den Zegel, Marcel Mestdagh
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Patent number: 5296342Abstract: For the processing in a total processing time of 60 seconds or less of exposed X-ray materials containing silver bromide or silver bromoiodide emulsions use is made of an aqueous alkaline photographic developing solution, having a pH in the range of 9 to 12, comprising a dihydroxybenzene developing agent, 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidinone as an auxiliary developing agent, at least one organic antifoggant and a compound providing iodide ions.Type: GrantFiled: November 12, 1992Date of Patent: March 22, 1994Assignee: Agfa-Gevaert, N.V.Inventors: Andre Roefs, Francis Sels, Marc Van den Zegel