Patents by Inventor Gary Sigai
Gary Sigai 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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Publication number: 20090146545Abstract: A low mercury consumption electric lamp is provided having a layer of a luminescent material which contains a phosphor blend having (1) about 50% by weight of the phosphor blend of a halophosphate phosphor wherein the average particle size of about 25% to 35% or more of the phosphor particles is about 3.3 to 4.0 microns or less, and (2) optionally, an intermediate layer of a Y, Sr, and borate material between the lamp surface and the phosphor layer.Type: ApplicationFiled: October 26, 2005Publication date: June 11, 2009Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: A. Gary Sigai, David C. Nesting
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Publication number: 20080284306Abstract: A low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (10) enclosing, in a gastight manner, a discharge space (13) provided with a filling of mercury and a rare gas. The discharge vessel comprises discharge means for maintaining a discharge in the discharge space. The discharge vessel is provided with a luminescent layer (17) comprising a mixture of at least a red and a green luminescent material. The red luminescent material comprises (Y,Gd)2O3:Eu. The green luminescent material comprises (Ba,Ca,Sr)2SiO4:Eu and/or (Sr,Ca,Ba,Mg,Zn)Si2N2O2:Eu. Particles of the green luminescent material are surrounded by a coating of aluminum oxide. Preferably, at least 50% of the particles of the green and red luminescent materials have an average diameter greater than or equal to approximately 5 ?m. The mixture of the red and green luminescent materials render a low-pressure mercury-vapor discharge lamp with an improved lumen equivalent.Type: ApplicationFiled: November 6, 2006Publication date: November 20, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: Volker Dirk Hildenbrand, Gary Sigai, Peter J. Schmidt
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Publication number: 20080238290Abstract: A low mercury consumption electric lamp is provided having a layer of a luminescent material comprising a phosphor derived from a mixture of a mixture of a cool-white calcium halophosphate, a red-emitting yttrium oxide (YOX), a green-emitting cerium, terbium lanthanum phosphate (LAP), and a blue-emitting europium-activated barium magnesium hexa-aluminate (BAM).Type: ApplicationFiled: January 27, 2005Publication date: October 2, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: Gary Sigai, Brett Carter
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Publication number: 20080231161Abstract: A low-mercury-consuming fluorescent lamp (1) contains a fine particle size alpha alumina in the phosphor-containing layer (16) on the inner surface (15) of the lamp envelope (3). The lamp envelope (3) may have one or more bends (22), in which case the phosphor-containing layer (16) additionally contains an adhesive, such as a borate adhesive, to enhance adhesion, especially in the bend areas. The phosphor-containing layer (16) may be formed from a water-based coating suspension to which the fine particle alpha alumina is added after its pre-dispersion in deionized water.Type: ApplicationFiled: September 19, 2006Publication date: September 25, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.Inventors: A. Gary Sigai, Charles Joseph Trushell
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Patent number: 6781302Abstract: A low mercury consumption electric lamp is provided having a a layer of a luminescent material comprising a phosphor derived from a mixture of a blue-halo calcium halophosphate phosphor having an average particle size within the range of about 6.6 to about 10 microns; a calcium-yellow calcium halophosphate phosphor having an average particle size within the range of about 9.0 to about 13 microns; and fines of a warm-white calcium halophosphate phosphor, preferably having an average particle size of about 4.62.Type: GrantFiled: September 27, 2002Date of Patent: August 24, 2004Assignee: Koninklijke Philips Electronics N.V.Inventors: Gary A. Sigai, Snehasish S. Ghosh, David Curtis Nesting, Brett A. Carter
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Publication number: 20040061428Abstract: A low mercury consumption electric lamp is provided having a a layer of a luminescent material comprising a phosphor derived from a mixture of a blue-halo calcium halophosphate phosphor having an average particle size within the range of about 6.6 to about 10 microns; a calcium-yellow calcium halophosphate phosphor having an average particle size within the range of about 9.0 to about 13 microns; and fines of a warm-white calcium halophosphate phosphor, preferably having an average particle size of about 4.62.Type: ApplicationFiled: September 27, 2002Publication date: April 1, 2004Inventors: A. Gary Sigai, Snehasish S. Ghosh, David Curtis Nesting, Brett A. Carter
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Patent number: 6683406Abstract: A low mercury consumption electric lamp is provided having a layer of a luminescent material comprising a phosphor selected from the group consisting of: (a) cool white phosphor comprising calcium halophosphate activated with antimony and manganese having an average particle size of about 8 to about 12 microns; and (b) a two phosphor blend of about 50% white calcium halophosphate activated with antimony and manganese and about 50% blue halo calcium halophosphate activated with antimony, wherein the blue halo phosphor has an average particle size of about 6.6 to about 10 microns.Type: GrantFiled: June 24, 2002Date of Patent: January 27, 2004Assignee: Koninklijke Philips Electronics N.V.Inventors: Gary Sigai, Snehasish Ghosh
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Publication number: 20030234606Abstract: A low mercury consumption electric lamp is provided having a a layer of a luminescent material comprising a phosphor selected from the group consisting of:Type: ApplicationFiled: June 24, 2002Publication date: December 25, 2003Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Gary Sigai, Snehasish Ghosh
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Patent number: 5309069Abstract: A fluorescent lamp providing improved maintenance and brightness includes an alkaline earth halophosphate (Cool-White) phosphor, e.g. a calcium halophosphate phosphor, having a continuous protective bilayer coating of alumina surrounding silica surrounding the phosphor particles. The lamp may be a high color rendition fluorescent lamp in which a first layer of alkaline earth halophosphate phosphor coats an inner surface of the lamp envelope, and a second layer of phosphor overlies the first layer of phosphor. The second layer of phosphor is a mixture of red, blue and green emitting phosphors, at least one of these being a zinc silicate phosphor. Each of the alkaline earth halophosphate and zinc silicate phosphors have a bilayer coating in which a coating of alumina surrounds a coating of silica which surrounds the phosphor.Type: GrantFiled: March 31, 1992Date of Patent: May 3, 1994Assignee: GTE Products CorporationInventors: A. Gary Sigai, Keith A. Klinedinst
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Patent number: 5223341Abstract: A phosphor of the type utilized in a fluorescent lamp and which includes core elements barium, lead, silicon, and oxygen where a continuous, conformal outer coating of hydration and solubilization resistant aluminum oxide, which is impermeable to migration of the core elements, surrounds the core whereby the outer surface of the core is substantially entirely free of the core elements.Type: GrantFiled: May 23, 1991Date of Patent: June 29, 1993Assignee: GTE Products CorporationInventor: A. Gary Sigai
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Patent number: 5196234Abstract: A method for preparing a specific zinc orthosilicate phosphor particle having a nonparticulate, conformal aluminum oxide coating wherein all of a manganese activator is present as manganese (II) and occupies zinc (II) sites includes the steps of blending a zinc source, a manganese (II) source, a silicon source, and a tungsten source in amounts in accordance with said formula with an amount of up to about 2 weight percent NH.sub.4 Cl and up to about 0.2 weight percent NH.sub.Type: GrantFiled: July 20, 1992Date of Patent: March 23, 1993Assignee: GTE Products CorporationInventors: Fred R. Taubner, A. Gary Sigai, Charles F. Chenot, Henry B. Minnier
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Patent number: 5169557Abstract: A process for production of lanthanum cerium aluminate phosphors represented by the formulaLa.sub.1-x Ce.sub.x Al.sub.y O.sub.(3/2)(y+1)wherein 0.10<x<1 and 11.0.ltoreq.y.ltoreq.12.5, the phosphor exhibiting a predominantly blue peak emission. Lanthanum (III) oxide, cerium (IV) oxide, and aluminum hydroxide are blended together in the desired ratios, then precalcined in air at about 850.degree. C. The precalcined product is then fired in a reducing atmosphere at about 1600.degree.-1800.degree. C. for about 3-4 hours, pulverized, refired in a reducing atmosphere at about 1600.degree.-1800.degree. C. for about 3-4 hours, and again pulverized to form the phosphor.Type: GrantFiled: March 20, 1990Date of Patent: December 8, 1992Inventors: A. Gary Sigai, Michael N. Alexander, Charles W. Struck
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Patent number: 5151215Abstract: A method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the alumina protective coating of a phosphor is described. The method involves the heating a fluidized alumina coated phosphor in a fluidized bed at a temperature and for a period of time sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After heating the fluidized phosphor is cooled and then added to a water-based suspension. The conditions for treating a manganese activated zinc silicate phosphor having a protective alumina coating are heating the fluidized phosphor at a temperature between about 700.degree. C. and about 850.degree. C. for a period of time from about 15 minutes to about 20 hours.A fluorescent lamp containing the phosphor prepared by the above described method is also described.Type: GrantFiled: December 9, 1991Date of Patent: September 29, 1992Assignee: GTE Products CorporationInventor: A. Gary Sigai
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Patent number: 5113118Abstract: A phosphor having a continuous protective bi-layer coating of alumina surrounding silica surrounding the phosphor particles is disclosed. The method of making a bi-layer coating on phosphor particles is also disclosed. The first layer surrounding the phosphor is silica. The second layer surrounding the phosphor is alumina. The bi-layer phosphor is useful in fluorescent lamps providing improved maintenance and brightness. The bi-layer phosphor can also be used in high color rendition lamps employing blends of phosphors.Type: GrantFiled: March 11, 1991Date of Patent: May 12, 1992Assignee: GTE Laboratories IncorporatedInventors: A. Gary Sigai, Keith A. Klinedinst
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Patent number: 5105121Abstract: Lanthanum cerium aluminate phosphor compositions are disclosed wherein the formula for the phosphor can be characterized as follows:La.sub.1-x Ce.sub.x Al.sub.y O.sub.(3/2)(y+1)wherein 0<x<1 and 11.ltoreq.y.ltoreq.13.8.Type: GrantFiled: August 23, 1989Date of Patent: April 14, 1992Assignee: GTE Laboratories IncorporatedInventors: Gary A. Sigai, Michael N. Alexander, Charles W. Struck
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Patent number: 5087523Abstract: A phosphor having a continuous protective bi-layer coating of alumina surrounding silica surrounding the phosphor particles is disclosed. The method of making a bi-layer coating on phosphor particles is also disclosed. The first layer surrounding the phosphor is silica. The second layer surrounding the phosphor is alumina. The bi-layer phosphor is useful in fluorescent lamps providing improved maintenance and brightness. The bi-layer phosphor can also be used in high color rendition lamps employing blends of phosphors.Type: GrantFiled: March 11, 1991Date of Patent: February 11, 1992Assignee: GTE Laboratories IncorporatedInventors: A. Gary Sigai, Keith A. Klinedinst
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Patent number: 5051277Abstract: The method of making a bi-layer coating on phosphor particles is disclosed. The first layer surrounding the phosphor is silica. The second layer surrounding the phosphor is alumina. The bi-layer phosphor is useful in fluorescent lamps providing improved maintenance and brightness. The bi-layer phosphor can also be used in high color rendition lamps employing blends of phosphors.Type: GrantFiled: January 22, 1990Date of Patent: September 24, 1991Assignee: GTE Laboratories IncorporatedInventors: A. Gary Sigai, Keith A. Klinedinst
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Patent number: 5039449Abstract: A new and improved method of treating a manganese activated zinc silicate phosphor is described. The method comprises heating a manganese activated zinc silicate phosphor powder having cations consisting essentially of zinc, silicon, manganese, and tungsten and having a 350 nm reflectance less than 80% and a 275 nm reflectance greater than 13.5% to a temperature of about 1225.degree. C. in air. The phosphor powder is then cooled to room temperature and wet milled in an acid solution. The phosphor powder is then separated from the acid solution washed in water and dried to form a dry phosphor powder having a 350 nm reflectance equal to or greater than 80% and a 275 nm reflectance equal to or less than 13.5%.Type: GrantFiled: November 7, 1988Date of Patent: August 13, 1991Assignee: GTE Laboratories IncorporatedInventors: Thomas E. Peters, Roger B. Hunt, A. Gary Sigai
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Patent number: 4979830Abstract: Disclosed is a method for adjustably controlling the rate of circulation and temperature gradient in a fluidized bed.Type: GrantFiled: October 2, 1989Date of Patent: December 25, 1990Assignee: GTE Products Corporation/GTE Laboratories, Inc.Inventors: Robin W. Munn, Dale E. Benjamin, A. Gary Sigai, Silvia E. Lichtensteiger
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Patent number: 4956202Abstract: A method for producing manganese activated zinc silicate phosphor wherein the individual phosphor particles are surrounded with a non-particulate, conformal aluminum oxide coating is disclosed. The method comprises dry blending a mixture of components consisting essentially of zinc oxide, silicic acid, a source of manganese, ammonium chloride, ammonium fluoride, tungstic oxide, and silica, wherein the Zn+Mn/Si mole ratio is from about 1.95 to about 2.02, wherein the silica is colloidal and has a surface area of from about 50 to about 410 m.sup.2 per gram, and wherein the colloidal silica makes up from about 0.01% to about 1.0% by weight of the mixture; firing the resulting dry blend of components in a nitrogen atmosphere at a temperature of from about 1200.degree. C. to about 1300.degree. C.Type: GrantFiled: October 27, 1989Date of Patent: September 11, 1990Assignees: GTE Products Corporation, GTE Laboratories IncorporatedInventors: Anthony F. Kasenga, A. Gary Sigai, Thomas E. Peters, Roger B. Hunt