Patents Represented by Attorney L. Rita Quatrini
  • Patent number: 4929385
    Abstract: A process is disclosed for preparing M' YTaO.sub.4 :Nb X-ray phosphor which comprises forming a uniform first mixture of Y.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Nb.sub.2 O.sub.5 in amounts equal to approximately the stoichiometric amounts to form the phosphor, milling with deionized water as the milling fluid, removing the water, forming a uniform second mixture of the first mixture and a flux which can be lithium sulfate, lithium chloride or a mix of lithium sulfate and potassium sulfate in a mole ratio of 80 to 20, the flux making up about 25% to 50% by weight of the second mixture, firing the second mixture in a furnace by heating to a temperature of about 1200.degree. C. to 1300.degree. C. at a heating rate of about 1.0.degree. C./minute to 1.5.degree. C./min.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: May 29, 1990
    Assignee: GTE Products Corporation
    Inventor: Vaddi B. Reddy
  • Patent number: 4927631
    Abstract: A decongestant preparation is disclosed which comprises a set of active components and a petrolatum base wherein the active components consist essentially of menthol, camphor, eucalyptus oil, and spirits of turpentine, wherein the total concentration of the active components is no greater than about 1.0% by weight of the decongestant preparation, and wherein the set of active components consists essentially of in percent by weight from about 15 to about 25 menthol, from about 30 to about 40 camphor, from about 5 to about 10 eucalyptus oil, and from about 30 to about 40 spirits of turpentine, the decongestant being suitable for direct application to the nasal cavity.
    Type: Grant
    Filed: February 16, 1989
    Date of Patent: May 22, 1990
    Inventor: Harry L. Bates
  • Patent number: 4925703
    Abstract: A manganese activated zinc silicate phosphor and method for producing same is disclosed which 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 /g, and wherein the colloidal silica makes up from about 0.01% to about 1.0% by weight, firing the blend in a nitrogen atmosphere at a temperature of from about 1200.degree. C. to about 1300.degree. C. for a sufficient time to produce the phosphor, and firing the phosphor in air at a temperature of from about 1175.degree. C. to about 1275.degree. C. for a sufficient time to diffuse the tungsten and manganese to the surfaces of the phosphor particles. Between the firing steps, the phosphor can be milled for from about 60 to 120 minutes to increase luminescence.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: May 15, 1990
    Assignee: GTE Products Corporation
    Inventors: Anthony F. Kasenga, A. Gary Sigai, Thomas E. Peters, Roger B. Hunt
  • Patent number: 4925702
    Abstract: A process is disclosed for producing M' phase YTaO.sub.4 :Nb X-ray phosphor which comprises forming a mixture of components Y.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Nb.sub.2 O.sub.5, and a flux which can be lithium chloride, lithium sulfate or a mix of lithium sulfate and potassium sulfate in an 80 to 20 mole ratio, the flux making up about 25% to 50% by weight of the mixture, the components being provided in stoichiometric amounts to form the phosphor, firing the mixture in a furnace by heating to a temperature of about 1200.degree. C. to 1300.degree. C. at a heating rate of about 1.0.degree. C./min. to 1.5.degree. C./min. and maintaining the temperature for about 10 to 14 hours to react the components and produce luminescent material, cooling the material by turning off the heat to the furnace and allowing the material to remain therein until the temperature is no higher than about 300.degree. C.
    Type: Grant
    Filed: October 2, 1989
    Date of Patent: May 15, 1990
    Assignee: GTE Products Corporation
    Inventor: Vaddi B. Reddy
  • Patent number: 4925594
    Abstract: A process is disclosed for producing a hydrolysis resistant rare-earth oxysulfide phosphor which comprises forming a uniform mixture of one or more rare earth oxides, sulfur, alkali carbonate, alkali phosphate, terbium oxide, and a zinc compound wherein the zinc compound is provided in an amount sufficient to result in a zinc concentration of from about 0.05% to about 1.0% by weight, heating the mixture in an air atmosphere in a covered vessel at a temperature of from about 900.degree. C. to about 1400.degree. C. for a sufficient time to form a terbium-activated rare-earth oxysulfide, washing the terbium-activated rare-earth oxysulfide with deionized water to remove essentially all of any water soluble impurities which are present, annealing the washed terbium-activated rare-earth oxysulfide in air at a temperature of from about 525.degree. C. to about 590.degree. C. for about 1 hour to about 3 hours to enhance the brightness of the phosphor.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: May 15, 1990
    Assignee: GTE Products Corporation
    Inventor: Ramon L. Yale
  • Patent number: 4900590
    Abstract: A method is disclosed for producing aluminum oxide coated iron powder which comprises contacting iron powder of fine particle size with a liquid aluminum compound wherein the aluminum is hydrolyzable and adding water to the compound and the iron powder to form a slurry, removing essentially all of the liquid from the slurry to produce iron powder with a coating of hydrolyzed aluminum oxide, and firing the iron powder with the hydrolyzed aluminum oxide coating in a non-oxidizing atmosphere to produce iron powder with a coating of aluminum oxide.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: February 13, 1990
    Assignee: GTE Products Corporation
    Inventors: Joseph E. Ritsko, Walter A. Johnson, Nelson E. Kopatz
  • Patent number: 4900587
    Abstract: A method is disclosed for producing aluminum oxide coated iron-aluminum alloy powder which comprises contacting iron-aluminum alloy powder of fine particle size with a liquid aluminum compound wherein the aluminum is hydrolyzable and adding water to the compound and the iron-aluminum alloy powder to form a slurry, removing essentially all of the liquid from the slurry to produce iron-aluminum alloy powder with a coating of hydrolyzed aluminum oxide, and firing the iron-aluminum alloy powder with the hydrolyzed aluminum oxide coating in a non-oxidizing atmosphere to produce iron-aluminum alloy powder with a coating of aluminum oxide.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: February 13, 1990
    Assignee: GTE Products Corporation
    Inventors: Joseph E. Ritsko, Walter A. Johnson, Nelson E. Kopatz
  • Patent number: 4898749
    Abstract: A method is disclosed for producing aluminum oxide coated cobalt powder which comprises contacting cobalt powder of fine particle size with a liquid aluminum compound wherein the aluminum is hydrolyzable and adding water to the compound and the cobalt powder to form a slurry, removing essentially all of the liquid from the slurry to produce cobalt powder with a coating of hydrolyzed aluminum oxide, and firing the cobalt powder with the hydrolyzed aluminum oxide coating in a non-oxidizing atmosphere to produce cobalt powder with a coating of aluminum oxide.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: February 6, 1990
    Assignee: GTE Products Corporation
    Inventors: Joseph E. Ritsko, Walter A. Johnson, Nelson E. Kopatz
  • Patent number: 4897217
    Abstract: A method is disclosed for producing alkaline earth halophosphate stir-in phosphors which comprises forming a mixture of about 55% to 75% calcium monohydrogen phosphate, about 15% to 35% calcium carbonate, about 2% to 20% ammonium chloride, about 1% to 15% manganese carbonate, about 1% to 15% antimony trioxide, and about 2% to 10% by weight calcium fluoride, wherein the average particle size of the calcium monohydrogen phosphate by Fisher subseive size is about 4.6 to 6.8 micrometers in diameter and the 50% Coulter Counter size is about 9.0 to 11.5, firing in a non-reacting atmosphere at 600.degree. C. to 1300.degree. C.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: January 30, 1990
    Assignee: GTE Products Corporation
    Inventors: Douglas M. Jackson, John A. Arbie, Sr., Richard G. W. Gingerich
  • Patent number: 4889703
    Abstract: A process is disclosed for producing tungstosilicic acid which involves adding sodium silicate to a first solution of sodium tungstate while assuring that the pH of the resulting mixture is from about 2 to about 6, the pH adjustments being made with a cation exchange resin on the hydrogen cycle, to produce a second solution. The solids are removed from the second solution which is digested at a temperature of greater than about 50.degree. C. and then contacted with a cation exchange resin on the hydrogen cycle to produce a third solution which is essentially a tungstosilicic acid solution containing at least about 99% by weight of the starting tungsten as tungstosilicic acid.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: December 26, 1989
    Assignee: GTE Products Corporation
    Inventors: Kenneth T. Reilly, Alan D. Douglas, Henry E. Hoffman
  • Patent number: 4888129
    Abstract: A terbium activated gadolinium oxysulfide phosphor having a green/blue emission ratio of from about 0.7 to about 2.0 is disclosed. A process is disclosed for producing this phosphor which comprises forming a uniform mixture of gadolinium oxide, sulfur, alkali carbonate, alkali phosphate, terbium oxide, wherein the terbium oxide is provided in an amount sufficient to result in a terbium concentration of from about 0.25% to about 0.9% by weight, and a zinc compound wherein the zinc compound is provided in an amount sufficient to result in a zinc concentration of from about 0.05% to about 1.0% by weight, the zinc concentration and the terbium concentration resulting in the above ratio, the ratio increasing as the zinc concentration increases and as the terbium concentration increases, heating the mixture in an atmosphere in a covered vessel at a temperature of from about 900.degree. C. to about 1400.degree. C.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: December 19, 1989
    Assignee: GTE Products Corporation
    Inventor: Ramon L. Yale
  • Patent number: 4882131
    Abstract: A tungsten extraction process wherein tungsten values are extracted from an aqueous alkali metal tungstate solution by an organic solution containing an amine extractant wherein the organic solution consists essentially of from about 6% to about 10% by volume of said amine extractant, and the balance of said organic solution being an aromatic solvent consisting essentially of a mixture of alkyl benzenes wherein the alkyl benzenes have molecular weights of 120, 134, or 148 and the total number of carbon atoms in the alkyl chains attached to the benzene ring are either 3, 4, or 5, and thereafter the tungstate values are removed from the organic solution by stripping with aqueous ammonia, is improved by carrying out the stripping step in the aqueous continuous mode, and having as the stripping agent, an aqueous solution of ammonium metatungstate having a tungsten concentration which allows the strip solution to have a specific gravity of no greater than about 1.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: November 21, 1989
    Assignee: GTE Products Corporation
    Inventors: John A. Powers, James C. Patton, James N. Christini
  • Patent number: 4873148
    Abstract: Metallic coated particles are disclosed which comprise a core consisting essentially of a material selected from the group consisting of metals, metal alloys, ceramics, ceramic glasses, and a coating relatively uniformly distributed on the core. The coating consists essentially of a relatively ductile and/or malleable metallic material selected from the group consisting of metals and metal alloys. The process for producing the coated particles involves increasing the aspect ratio of the ductile and/or malleable material, and mechanically applying it to a powder material which is to be the core of the particles.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: October 10, 1989
    Assignee: GTE Products Corporation
    Inventors: Preston B. Kemp, Jr., Robert J. Holland, Sr.
  • Patent number: 4863527
    Abstract: A process is disclosed for producing doped tungsten wire having a combination of relatively low strength and high ductility. The process involves swaging recrystallized rod to a diameter of from about 80 to about 125 mil, drawing this rod into wire having a diameter of from about 52 to about 62 mil, and stress-relief annealing the wire to impart the combination of low strength and high ductility to the wire when it is drawn to about 35 to about 37 mils.
    Type: Grant
    Filed: June 5, 1987
    Date of Patent: September 5, 1989
    Assignee: GTE Products Corporation
    Inventors: Gene T. Schaeffer, Thomas J. Patrician, Paul L. Bloss
  • Patent number: 4859497
    Abstract: A process is disclosed for pigmenting and coating a silver activated zinc sulfide phosphor and for imparting stir-in capabilities to the phosphor. The process comprises deagglomerating the phosphor, forming an aqueous slurry of phosphor particles, pigment particles, a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and a silica-based compound to produce a silica based coating on the phosphor particles, and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them and wherein the pigmented phosphor particles are coated with the silica-based coating. The process comprises also pigmenting the phosphor and imparting stir-in capabilities thereto by the process as described above without adding the coating agent to the slurry.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: August 22, 1989
    Assignee: GTE Products Corporation
    Inventors: Robert W. Wolfe, James E. Morse
  • Patent number: 4859361
    Abstract: A process is disclosed for producing an electroluminescent phosphor which comprises blending a chloride flux, a copper source, and zinc sulfide to form a relatively uniform admixture, heating the admixture at a temperature of from about 1000.degree. C. to about 1300.degree. C.
    Type: Grant
    Filed: January 17, 1989
    Date of Patent: August 22, 1989
    Assignee: GTE Products Corporation
    Inventors: Kenneth T. Reilly, Richard G. W. Gingerich
  • Patent number: 4859237
    Abstract: A process for producing a blend of maraging steel alloys and an oxidizable metal comprises forming an aqueous solution or iron, cobalt, nickel and molybdenum in a predetermined ratio. Thereafter, a reducible solid material containing the metals is produced from the solution. The solid material is reduced to metallic powder particles which are entrained in a carrier gas and fed into a high temperature zone to form droplets which are cooled to form essentially spherical shaped metal alloy particles. These particles are combined with a predetermined amount of at least one easily oxidizable metal selected from the group consisting of aluminum, titanium and vanadium to form a relative uniform blend of the spherical shaped particles and the readily oxidizable metal.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: August 22, 1989
    Assignee: GTE Products Corporation
    Inventors: Walter A. Johnson, Nelson E. Kopatz, Joseph E. Ritsko
  • Patent number: 4859236
    Abstract: A process is disclosed for producing molybdenum-ruthenium metal powder which comprises forming an ammonium molybdate solution, heating that solution to drive off excess ammonia, and thereafter adding ruthenium dioxide to that heated ammonium molybdate solution to form a slurry of ruthenium dioxide in the ammonium molybdate solution. Molybdenum trioxide and ruthenium dioxide are then crystallized from the slurry to produce a uniform mixture of molybdenum trioxide and ruthenium dioxide which is heated at a temperature of from about 300.degree. C. to about 800.degree. C. for a sufficient time in a reducing atmosphere to reduce the molybdenum trioxide and ruthenium dioxide to their respective metals and form a uniform mixture of the metals. The metal mixture is heated at a temperature of from about 800.degree. C. to about 1200.degree. C. for a sufficient time in a reducing atmosphere to stabilize the mixture at a particle size of -325 mesh, and then cooled in a non-reacting atmosphere.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: August 22, 1989
    Assignee: GTE Products Corporation
    Inventors: Thomas J. Patrician, Joseph E. Ritsko, Harry D. Martin, III
  • Patent number: 4853254
    Abstract: A process is disclosed for binding pigment particles to phosphor particles which involves forming an aqueous slurry of phosphor particles, pigment particles, and a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: August 1, 1989
    Assignee: GTE Products Corporation
    Inventor: Robert W. Wolfe
  • Patent number: 4847045
    Abstract: A process is disclosed for producing a sheet of tungsten heavy alloy which involves uniformly blending elemental metal powder components of the alloy by forming a slurry of the powder components in a liquid medium, introducing the slurry onto a filter medium and applying vacuum to the bottom of the slurry to form a planar cake of the powder components. The cake is then dried and sintered to a density equal to or greater than about 90% of the theoretical density of the alloy to form the sheet.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: July 11, 1989
    Assignee: GTE Products Corporation
    Inventors: Preston B. Kemp, Jr., Walter A. Johnson