Patents by Inventor Melvin Tecotzky
Melvin Tecotzky 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: 5944748Abstract: A device for applying light in photodynamic therapy is arranged to apply light in a pattern corresponding to the configuration of the lesion to be treated. The device may be customized in response to an image of the patient acquired before treatment. Alternatively, the device may include sensors for detecting a characteristic of tissue overlying each region of the device so that the device either emits light or does not emit light in each region depending upon the characteristics of the overlying tissue.Type: GrantFiled: July 25, 1997Date of Patent: August 31, 1999Assignee: Light Medicine, Inc.Inventors: David Mager, Harvey I. Pass, Melvin Tecotzky
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Patent number: 5629125Abstract: A photostimulable phosphor, wherein said phosphor is within the scope of the following empirical formula (A):Ba.sub.1-x-y-p-z Sr.sub.x M.sub.y.sup.II Cs.sub.2p F.sub.2-a-b Br.sub.a X.sub.b :zEuwherein:X is at least one halogen selected from the group consisting of Cl and I,M.sup.II is at least one alkaline earth metal selected from the group consisting of Ca and Mg;x is in the range 0.10.ltoreq.x.ltoreq.0.55;a is in the range 0.70.ltoreq.a.ltoreq.0.96;y is in the range 0.ltoreq.y.ltoreq.0.10;b is in the range 0.ltoreq.b<0.15;p is in the range 10.sup.-4 .ltoreq.p.ltoreq.10.sup.-1 ; andz is in the range 10.sup.-6 .ltoreq.z.ltoreq.10.sup.-2.Type: GrantFiled: May 10, 1995Date of Patent: May 13, 1997Assignee: Agfa-Gevaert, N.V.Inventors: Paul Leblans, Albert D. Adriaensens, Melvin Tecotzky
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Patent number: 5547807Abstract: A photostimulable phosphor of which the emission intensity at the stimulation wavelength of 550 nm is higher than the emission intensity at the stimulation wavelength of 600 nm, characterized in that said phosphor is a divalent europium activated barium fluorobromide containing as codopant samarium, and wherein the terminology barium fluorobromide stands for an empirical formula wherein (1) a minor part of the barium (less than 50 atom %) is replaced optionally by at least one metal selected from the group consisting of a monovalent alkali metal, a divalent alkaline earth metal other than barium, and a trivalent metal selected from the group consisting of Al, Ga, In, Tl, Sb, Bi, Y, and a rare earth metal selected from the group consisting of Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, (2) a minor part (less than 50 atom %) of the bromine is replaced by chlorine, and/or iodine, and (3) wherein fluorine is present stoichiometrically in a larger atom % than bromine taken alone or bromine combined with chlorinType: GrantFiled: March 15, 1995Date of Patent: August 20, 1996Assignee: AGFA-Gevaert, N.V.Inventors: Paul Leblans, Albert D. Adriaensens, Melvin Tecotzky, Jan A. Van den Bogaert
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Patent number: 5514874Abstract: An invention is described which uses quenchable phosphors to achieve a novel emission response in intensifying screens. The quenchable phosphor has the characteristic of reducing its efficiency of converting incident x-ray, gamma ray, or ionizing particulate radiations into emitted radiation in the ultraviolet (UV), visible or infrared (IR) regions of the electromagnetic spectrum when being essentially simultaneously irradiated by a spectrum of radiation of a specific range in the UV to visible to IR spectrum. The quenchable phosphor is combined with another class of phosphor, which emits the spectrum of radiation when struck by ionizing radiation which is similar or identical to the quenching radiation of the quenchable phosphor. These phosphors can be combined in a variety of geometrical manners, both homogeneously and heterogeneously, to achieve extended dynamic range and spatial frequency filtering for radiographic imaging systems.Type: GrantFiled: February 7, 1994Date of Patent: May 7, 1996Assignee: Thomas Jefferson UniversityInventors: John M. Boone, Melvin Tecotzky
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Patent number: 5514298Abstract: A photostimulable rare earth metal doped barium strontium fluoride phosphor, characterized in that said phosphor is within the scope of following empirical formula (I):Ba.sub.1-x Sr.sub.x F.sub.2-a-b Br.sub.a X.sub.b :zAwherein:X is at least one member selected from the group consisting of Cl and I;x is in the range 0.06.ltoreq.x.ltoreq.0.50;a is in the range 0.75.ltoreq.a.ltoreq.0.96;b is in the range 0.ltoreq.b<0.15;z is in the range 10.sup.-7 <z.ltoreq.0.15, andA is Eu.sup.2+ and wherein fluorine is present stoichiometrically in said phosphor in a larger atom % than bromine taken alone or bromine combined with chlorine and/or iodine.Type: GrantFiled: May 30, 1995Date of Patent: May 7, 1996Assignee: Agfa-Gevaert, N.V.Inventors: David R. Terrell, Albert D. Adriaensens, Lodewijk M. Neyens, Melvin Tecotzky, Benjamas S. Davis
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Patent number: 5422220Abstract: A photostimulable phosphor of which the emission intensity at the stimulation wavelength of 550 nm is higher than the emission intensity at the stimulation wavelength of 600 nm, characterized in that said phosphor is a divalent europium activated barium fluorobromide containing as codopant samarium, and wherein the terminology barium fluorobromide stands for an empirical formula wherein (1) a minor part of the barium (less than 50 atom %) is replaced optionally by at least one metal selected from the group consisting of a monovalent alkali metal, a divalent alkaline earth metal other than barium, and a trivalent metal selected from the group consisting of Al, Ga, In, Tl, Sb, Bi, Y, and a rare earth metal selected from the group consisting of Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, (2) a minor part (less than 50 atom %) of the bromine is replaced by chlorine, and/or iodine, and (3) wherein fluorine is present stoichiometrically in a larger atom % than bromine taken alone or bromine combined with chlorinType: GrantFiled: May 16, 1994Date of Patent: June 6, 1995Assignee: Agfa-Gevaert N.V.Inventors: Paul Leblans, Albert D. Adriaensens, Melvin Tecotzky, Jan A. Van den Bogaert
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Patent number: 5216252Abstract: A binary screen, system and method for performing dual energy radiographic imaging, using single pulse x-rays, are depicted. The binary screen includes a first phosphor which emits light of a first wavelength and a second phosphor which emits light of a second wavelength. The first and second phosphors are heterogeneously dispersed in the binary screen. The first phosphor is preferably Gd.sub.2 O.sub.2 S:Eu.sup.+3 and the second phosphor is preferably Y.sub.2 O.sub.2 S:Gd.sup.+3. The second phosphor can also be Y.sub.2 O.sub.3 :Gd, Y.sub.2 O.sub.2 S:Pr or Y.sub.2 O.sub.2 S:Neodymium.Type: GrantFiled: July 24, 1991Date of Patent: June 1, 1993Assignee: Thomas Jefferson UniversityInventors: John M. Boone, Melvin Tecotzky
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Patent number: 5140163Abstract: A method for recording and reproducing an X-ray image is provided which method comprises the steps of:(1) causing a photostimulable phosphor to absorb image-wise or pattern-wise modulated X-rays,(2) photostimulating said phosphor with stimulating electromagnetic radiation selected from visible light and infrared light to release from the phosphor in accordance with the absorbed X-rays electromagnetic radiation different in wavelength characteristic from the radiation used in the photo-stimulation, and(3) detecting said light emitted by photostimulation, wherein said phosphor is a halosilicate containing as host metal at least one member selected from the group consisting of Ca, Sr, Ba, Mg, Cd, Zn and Pb, as halogen at least one member selected from the group consisting of Cl, Br and I, and comprising as dopant(s) Eu.sup.2+ and/or Cr.sup.3+.Type: GrantFiled: September 16, 1988Date of Patent: August 18, 1992Assignee: Agfa-Gevaert, N.V.Inventors: Melvin Tecotzky, George Blasse, Andries Meijerink, David R. Terrell, Luc A. Struye
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Patent number: 5138171Abstract: A photostimulable X-ray energy absorbing halosilicate, halogermanate or halo(silicate-germanate) phosphor, characterized in that said phosphor contains as host metal at least one alkaline earth metal, as halogen at least one member selected from the group consisting of Cl, Br and I, as dopant Eu.sup.2+ and as co-dopant at least one member selected from the group consisting of niobium and tantalum.Type: GrantFiled: March 19, 1991Date of Patent: August 11, 1992Assignee: AGFA-Gevaert, N.V.Inventors: Melvin Tecotzky, Paul Leblans
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Patent number: 5034607Abstract: A method for recording and reproducing an X-ray image comprising the steps of:(1) causing a photostimulable phosphor in a binder layer to absorb image-wise or pattern-wise modulated X-rays,(2) photostimulating said phosphor with stimulating electromagnetic radiation selected from visible light and infrared light to relase from the phosphor in accordance with the absorbed X-rays electromagnetic radiation different in wavelength characteristic from the radiation used in the photo-stimulation, and(3) detecting said light emitted by photostimulation, wherein said phosphor is an alkali earth metal(s) halogermanate or an alkali earth metal(s) halo(silicate-germanate) doped with Eu.sup.2+ and/or Ce.sup.3+ and/or thallium, and optionally co-doped with a rare earth metal ion other than Eu.sup.2+ or Ce.sup.3+ or with Na.sup.+, K.sup.+ or Li.sup.+ or a mixture of at least two of these co-dopants.Type: GrantFiled: April 4, 1990Date of Patent: July 23, 1991Assignee: Agfa-Gevaert, N.V.Inventors: William A. McAllister, Lodewijk M. Neyens, Melvin Tecotzky
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Patent number: 3980887Abstract: Rare earth oxysulfide phosphors with excellent optical properties and optimum particle size control for use as photoluminescent, cathodoluminescent and X-ray luminescent phosphors are prepared by treating a solution of at least one salt of a rare earth metal and a salt of a rare earth activator to form solid salts and thereafter heating the oxidic compound with a sulfidizing agent and a silicon sensitizer, preferably in the presence of a fluoride. The rare earth oxysulfide phosphors thus obtained contain from 10 to 1,000 p.p.m. silicon sensitizer and, if used, 20 to 500 p.p.m. fluoride, incorporated in the crystal lattice structure.Type: GrantFiled: April 11, 1975Date of Patent: September 14, 1976Assignee: U.S. Radium CorporationInventors: James J. Mattis, Melvin Tecotzky
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Patent number: 3970582Abstract: New phosphors which may be activated to luminesce in the red to green portion of the spectrum have an alpha crystal structure isostructural with Ba.sub.2 MnS.sub.3 and the compositionBa.sub.2 Zn.sub.1.sub.-y Cd.sub.y S.sub.3 : A.sub.w.sup.. zZnSwherein A is an activator element selected from the group consisting of manganese, europium, cerium, lead and terbium, y is a numerical value in the range from 0 to 1, z is a numerical value in the range from 0 to 20, and w is a numerical value in the range from 0.00001 to 0.1. Methods of making these phosphors are described.Type: GrantFiled: December 4, 1975Date of Patent: July 20, 1976Assignee: United States Radium CorporationInventors: Albert K. Fan, Melvin Tecotzky
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Patent number: 3950668Abstract: Rare earth oxysulfide phosphors with excellent optical properties and optimum particle size control for use as cathodo-luminescent phosphors in cathode ray tubes are prepared by treating a solution of at least one salt of a rare earth metal and a salt of a rare earth activator to form solid salts and thereafter heating the oxidic compound with a sulfidizing agent and a silicon sensitizer, preferably in the presence of a fluoride. The rare earth oxysulfide phosphors thus obtained contain from 10 to 1,000 p.p.m. silicon sensitizer and, if used, 20 to 500 p.p.m. fluoride, incorporated in the crystal lattice structure.Type: GrantFiled: April 11, 1975Date of Patent: April 13, 1976Assignee: U.S. Radium CorporationInventors: James J. Mattis, Melvin Tecotzky