Patents by Inventor Charles F. Chenot
Charles F. Chenot 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: 7014793Abstract: A method of making zinc sulfide based electroluminescent phosphors is described wherein a first-fired zinc sulfide material having a hexagonal ?-ZnS crystal structure is at least partially converted to a distorted hexagonal ?-ZnS crystal structure by ultrasonic irradiation. The first-fired material is then fired at a lower temperature to form an electroluminescent phosphor.Type: GrantFiled: August 19, 2005Date of Patent: March 21, 2006Assignee: OSRAM SYLVANIA Inc.Inventors: Charles F. Chenot, Judy A. Belinski-Wolfe, Fuquiang Huang
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Publication number: 20040007692Abstract: A method of making zinc sulfide based electroluminescent phosphors is described wherein a first-fired zinc sulfide material having a hexagonal &bgr;-ZnS crystal structure is at least partially converted to a distorted hexagonal &bgr;-ZnS crystal structure by ultrasonic irradiation. The first-fired material is then fired at a lower temperature to form an electroluminescent phosphor.Type: ApplicationFiled: May 9, 2003Publication date: January 15, 2004Inventors: Charles F. Chenot, Judy A. Belinski-Wolfe, Fuquiang Huang
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Patent number: 6303051Abstract: A novel phosphate treated silicate phosphor has been invented that exhibits improved lumen maintenance with respect to the untreated phosphor when used in a fluorescent lamp. In one aspect, a protective phosphate-containing surface layer is formed by treating the phosphor in an aqueous phosphate solution, filtering, and annealing. In particular, a BaSi2O5:Pb phosphor that has been treated in this way exhibits improved maintenance in a fluorescent lamp and a characteristic X-ray diffraction pattern evidencing the presence of the protective phosphate-containing surface layer.Type: GrantFiled: September 9, 1999Date of Patent: October 16, 2001Assignee: Osram Sylvania Inc.Inventors: Anthony L. Diaz, Charles F. Chenot
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Patent number: 6149839Abstract: A cation-treated silicate phosphor and fluorescent lamp made therefrom are provided wherein the 100 hour radiance maintenance is significantly improved. The cation treatment method involves adding an amount of a silicate phosphor to a salt solution containing a cation wherein the ratio of cation to phosphor in the solution is from about 1:2 to about 4:1 moles of cation to moles of phosphor. The solution is then stirred for a time sufficient to cause the cation to attach to the phosphor surface to form a cation-treated phosphor. The cation-treated phosphor is separated from the solution and annealed at a temperature and for a time sufficient to increase radiance maintenance of the cation-treated phosphor.Type: GrantFiled: May 28, 1999Date of Patent: November 21, 2000Assignee: Osram Sylvania Inc.Inventors: Anthony L. Diaz, Charles F. Chenot, Shelley A. Sonner
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Patent number: 6045721Abstract: A barium magnesium aluminate phosphor having improved maintenance and efficiency is provided. The novel phosphor is suitable for use in conventional fluorescent lamp applications and applications utilizing VUV excitation, including Xe excimer lamps and plasma display panels.Type: GrantFiled: December 23, 1997Date of Patent: April 4, 2000Assignee: Patent-Treuhand-Gesellschaft fur Elekrische Gluhlampen mbHInventors: Martin Zachau, Dieter Schmidt, Ulrich Mueller, Charles F. Chenot
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Patent number: 5985175Abstract: A method for forming a continuous, conformal non-particulate coating of boron oxide on individual phosphor particles is provided. The method involves reacting a boron-containing precursor with an oxidizing gas in a fluidized bed of phosphor particles. The boron oxide coated phosphor exhibits an increased quantum efficiency under ultraviolet (UV) and vacuum ultraviolet (VUV) excitation.Type: GrantFiled: August 19, 1998Date of Patent: November 16, 1999Assignee: Osram Sylvania Inc.Inventors: Chen-Wen Fan, Dale E. Benjamin, Franz Kummer, Charles F. Chenot, Richard G. W. Gingerich
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Patent number: 5676917Abstract: A fine, largely beta phase calcium pyrophosphate powder for, e.g., a diffuser coating for the interior surface of lamp envelopes. The powder is useful for electrostatic deposition of such coatings under varying conditions of environmental humidity. A process for the synthesis of the calcium pyrophosphate is also disclosed. Dibasic calcium orthophosphate (monetite) is dissolved in a dilute aqueous hydrochloric acid solution and spray-dried to form a calcium phosphate powder of spherically shaped hollow particles. The calcium phosphate powder is fired in air to convert the calcium phosphate powder to a spherical calcium pyrophosphate powder including the beta phase as a major component and the gamma phase as a minor component. For a diffuser coating, the poder is sonicated to fragment a portion of the hollow particles.Type: GrantFiled: September 20, 1996Date of Patent: October 14, 1997Assignee: Osram Sylvania Inc.Inventors: Leslie F. Trudeau, Charles F. Chenot, Richard G. W. Gingerich
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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: 5188763Abstract: A manganese-activated zinc orthosilicate phosphor having the empirical formula:Zn.sub.(2.00-x-y) Mn.sub.x SiO.sub.(4.00-y) (WO.sub.3).sub.zwherein:0.04.ltoreq.x.ltoreq.0.15;0.ltoreq.y.ltoreq.0.05; and0.ltoreq.z.ltoreq.0.002is provided. A method for preparing the above described phosphor is also disclosed. The method comprises blending a method for preparing manganese-activated zinc orthosilicate phosphor having the empirical formula:Zn.sub.(2.00-x-y) Mn.sub.x SiO.sub.(4.00-y) (WO.sub.3).sub.zwherein:0.04.ltoreq.x.ltoreq.0.15;0.ltoreq.y.ltoreq.0.05; and0.ltoreq.z.ltoreq.0.002;the method comprising: blending a zinc source, a manganese (II) source, a silicon source, and a tungsten source in amounts in accordance with the formula together with up to about 2 weight percent NH.sub.4 Cl and up to about 0.2 weight percent NH.sub.Type: GrantFiled: April 9, 1992Date of Patent: February 23, 1993Assignee: GTE Products CorporationInventors: Charles F. Chenot, Henry B. Minnier
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Patent number: 5132042Abstract: A method of making a lanthanum cerium terbium phosphate phosphor involves the single-step reaction of single-phase, mixed valence state lanthanum cerium terbium oxide with boron phosphate in the presence of a flux-forming compound containing lithium. The resulting phosphor is up to 5% brighter than the same phosphor prepared without the lithium-containing compound.Type: GrantFiled: May 14, 1990Date of Patent: July 21, 1992Assignee: GTE Products CorporationInventors: Chung N. Chau, Anthony F. Kasenga, Charles F. Chenot, Leslie F. Gray
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Patent number: 5116532Abstract: A method of making a lanthanum cerium terbium phosphate phosphor involves the single-step reaction of a single-phase, mixed valence state lanthanum cerium terbium oxide and boron phosphate. Alternatively, the single-step reaction may involve a mixture of lanthanum oxide, cerium oxide, terbium oxide and boron phosphate.Type: GrantFiled: May 14, 1990Date of Patent: May 26, 1992Assignee: GTE Products CorporationInventors: Chung N. Chau, Anthony F. Kasenga, Charles F. Chenot, Leslie F. Gray
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Patent number: 5068055Abstract: A europium activated strontium tetraborate UV emitting phosphor is disclosed having a weight composition of from about 34.72% to about 35.80 strontium %, from about 17.66% to about 17.78 boron %, from about 0.37% to about 1.86% europium, and the balance oxygen. The phosphor has essentially elongated prism-like particles with the europium relatively uniformly distributed throughout the balance of the phosphor and with the particle size distribution being characterized by the 50% size being in the range of from about 7 micrometers to about 12 micrometers as determined by Coulter Counter measurement and with less than about 12% by weight of the particles having a particle size of greater than about 16 micrometers as determined by Coulter Counter measurement. The process for making the phosphor is disclosed which involves forming a mixture of strontium carbonate and europium carbonate in an aqueous solution of boric acid at a temperature of at least about 70.degree. C. with the mole ratio of SrCO.sub.3 to H.sub.Type: GrantFiled: February 25, 1991Date of Patent: November 26, 1991Assignee: GTE Products CorporationInventors: Charles F. Chenot, Michael A. Krebs
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Patent number: 4915976Abstract: A process is disclosed for applying a lubricant to a powdered material to control the fluidity of the powdered material. In the process one first obtains at least x number of samples of the powdered material without lubricant. Thereafter, increasing amounts of lubricant are applied to x-1 number of the samples. The bulk and tap densities of the samples are then measured and the Hausner ratio from the densities is calculated. The Hausner ratio versus the concentration of the lubricant in the powder samples is plotted and the concentrations of the minima lubricant in the powder samples at the point of the plot obtained in step e are determined. The concentration of lubricant determined in step f is applied to the remainder of the powdered material whereby an operational level of fluidity of the powder is achieved.Type: GrantFiled: December 5, 1988Date of Patent: April 10, 1990Assignee: GTE Products CorporationInventors: Doris L. Brown, Charles F. Chenot, Deborah V. Lutz, Robin W. Munn
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Patent number: 4719033Abstract: A europium activated strontium tetraborate UV emitting phosphor is disclosed having a weight composition of from about 34.72% to about 35.80 strontium %, from about 17.66% to about 17.78 boron %, from about 0.37% to about 1.86% europium, and the balance oxygen. The phosphor has essentially elongated prism-like particles with the europium relatively uniformly distributed throughout the balance of the phosphor and with the particle size distribution being characterized by the 50% size being in the range of from about 7 micrometers to about 12 micrometers as determined by Coulter Counter measurement and with less than about 12% by weight of the particles having a particle size of greater than about 16 micrometers as determined by Coulter Counter measurement. The process for making the phosphor is disclosed which involves forming a mixture of strontium oxide and europium carbonate in an aqueous solution of boric acid at a temperature of at least about 70.degree. C. with the mole ratio of SrCO.sub.3 to H.sub.3 BO.Type: GrantFiled: August 28, 1986Date of Patent: January 12, 1988Assignee: GTE Products CorporationInventors: Charles F. Chenot, Michael A. Krebs
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Patent number: 4698548Abstract: Calcium fluorophosphate phosphor co-activated by specific levels of antimony and manganese emits in a narrow portion of the yellow region of the spectrum making such phosphor useful in fluorescent lamps. Furthermore, when blended in specific proportions with a blue-emitting divalent europium activated strontium halophosphate, and incorporated into a fluorescent lamp, the resultant lamp gives an increased lumen per watt output over a "cool white" lamp incorporating a standard "cool white" calcium halophosphate phosphor.Type: GrantFiled: March 5, 1987Date of Patent: October 6, 1987Assignee: GTE Products CorporationInventors: Charles F. Chenot, Robert E. Taylor, deceased, Vincent Chiola, executrix, Wolfgang Walter
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Patent number: 4684539Abstract: A process is disclosed for producing a europium activated strontium borate phosphor having a strontium containing coating. The process involves washing a europium activated strontium borate phosphor with a solution of strontium hydroxide to produce a first washed phosphor followed by removing the first washed phosphor from the resulting wash solution. The first washed phosphor is washed with a wash solution selected from the group consisting of ammonium fluoride in alcohol, ammonium bifluoride in alcohol, and a strontium salt in ammonium hydroxide, followed by removing the resulting second washed phosphor from the resulting wash solution. The second washed phosphor is then heated to produce the coated phosphor.Type: GrantFiled: August 4, 1986Date of Patent: August 4, 1987Assignee: GTE Products CorporationInventors: Charles F. Chenot, Leslie F. Gray, Michael A. Krebs
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Patent number: 4613453Abstract: In the manufacture of an alkaline earth haloapatite phosphor, raw materials including calcium carbonate are blended together and then fired. However, before blending, the particle size of the calcium carbonate is first determined, and the quantities of some of the other raw materials are adjusted in a manner dependent on said particle size.Type: GrantFiled: September 6, 1985Date of Patent: September 23, 1986Assignee: GTE Products CorporationInventor: Charles F. Chenot
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Patent number: 4458176Abstract: A fluorescent lamps having colors similar to standard daylight can be prepared using two component compositions. A blue emitting phosphor having a peak emission with a specified range and a 50% band width within a specified range along with specific amounts of a yellow-emitting phosphor having a 50% band width within a specified range and a peak emission within a specified range provide a daylight lamp with a higher lumer per watt than the standard daylight lamp.Type: GrantFiled: June 22, 1979Date of Patent: July 3, 1984Assignee: GTE Products CorporationInventors: Charles F. Chenot, Wolfgang Walter
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Patent number: 4426600Abstract: A fluorescent lamps having colors similar to standard white can be prepared using two phosphor compositions. A blue emitting phosphor having a peak emission with a specified range and a 50% band width within a specified range is used with specific amounts of a yellow-emitting phosphor having a 50% band width within a specified range and a peak emission within a specified range provide a lamp having the same chromaticity as a standard white lamp with a higher lumer per watt than the standard white lamp. In one embodiment the blue emitting component has a second specific peak emission and a specific 50% bandwidth.Type: GrantFiled: June 22, 1979Date of Patent: January 17, 1984Assignee: GTE Products CorporationInventors: Charles F. Chenot, Wolfgang Walter
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Patent number: 4306173Abstract: A luminescent phosphor composition having enhanced luminescent decay lifetime consists essentially of a non-stoichiometric tin and manganese coactivated alkaline earth orthophosphate represented by the formulaSr.sub.(3-v-w-x-y-z) .quadrature..sub.v Mg.sub.w Ca.sub.x (PO.sub.2).sub.4 :Sn.sub.y Mn.sub.zwhere0.001.ltoreq.v.ltoreq.0.050.180.ltoreq.w.ltoreq.0.350.ltoreq.x.ltoreq.0.080.015.ltoreq.y.ltoreq.0.050.0005.ltoreq.z.ltoreq.0.0905.An improved fluorescent lamp employing the disclosed phosphor is also described.Type: GrantFiled: March 31, 1980Date of Patent: December 15, 1981Assignees: GTE Laboratories Inc., GTE Products CorporationInventors: Romano G. Pappalardo, Charles F. Chenot