Patents by Inventor William H. Rhodes

William H. Rhodes 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).

  • Publication number: 20200248620
    Abstract: A gas turbine engine includes a compressor section, a combustor, and a turbine section. A bleed tap taps air from the compressor section through a bleed valve. The bleed valve is selectively opened by a control to dump air from the compressor section to a dump outlet. A heat exchanger duct includes a duct air inlet to cool a fluid in a heat exchanger and a duct air outlet. The dump outlet is within the heat exchanger duct.
    Type: Application
    Filed: February 6, 2019
    Publication date: August 6, 2020
    Inventors: Steven H. Zysman, Karl D. Blume, James H. Anderson, Holly Teufel, Jesse W. Clauson, Xiaojun Campbell, William O. Taylor, Graham A. Kaiser, Karl Milenkovic, Michael C. Rhodes, Tsering Dolma
  • Patent number: 8501081
    Abstract: Polycrystalline alumina and methods for manufacturing polycrystalline alumina exhibiting improved transmission in the infrared region. In one embodiment, polycrystalline alumina articles are formed by providing a powder of substantially alpha phase alumina having a grain size of up to about 1 ?m, dispersing the powder in a liquid to form a slurry comprising powdered solids and liquid, removing excess of the liquid from the slurry to form a body, heating the body to provide a densified body, hot isostatically pressing the densified body under conditions to provide an article having a density of at least about 99.9% of theoretical density, and optionally annealing the article, wherein one or more of the annealing or heating are performed in an inert, dry gas.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: August 6, 2013
    Assignee: Ceranova Corporation
    Inventors: Mark V. Parish, Marina R. Pascucci, William H. Rhodes
  • Publication number: 20100025896
    Abstract: Polycrystalline alumina and methods for manufacturing polycrystalline alumina exhibiting improved transmission in the infrared region. In one embodiment, polycrystalline alumina articles are formed by providing a powder of substantially alpha phase alumina having a grain size of up to about 1 ?m, dispersing the powder in a liquid to form a slurry comprising powdered solids and liquid, removing excess of the liquid from the slurry to form a body, heating the body to provide a densified body, hot isostatically pressing the densified body under conditions to provide an article having a density of at least about 99.9% of theoretical density, and optionally annealing the article, wherein one or more of the annealing or heating are performed in an inert, dry gas.
    Type: Application
    Filed: October 24, 2008
    Publication date: February 4, 2010
    Applicant: CeraNova Corporation
    Inventors: Mark V. Parish, Marina R. Pascucci, William H. Rhodes
  • Patent number: 7592281
    Abstract: A composition is provided that includes a plurality of calcined particles of terbium aluminum oxide having a mean particle domain size of between 30 and 600 nanometers. A translucent article having a surface includes polycrystalline terbium aluminum garnet having a mean grain size from 1 to 10 microns and light scattering inclusions of aluminum-rich oxide and/or terbium-rich oxide that are present at less than 2 surface area percent of the surface. A process for forming such an article involves sintering the above provided composition at a temperature between 1500° C. and 1700° C. to yield a sintered article. The article has improved translucency and even transparency as sintering is performed under vacuum at a temperature between 1610° C. and 1680° C. Hot isostatic pressing alone or in combination with article polishing also improves article translucency.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: September 22, 2009
    Assignee: Nanocerox, Inc.
    Inventors: Yin Tang, Anthony C. Sutorik, Long Nguyen, Tom Hinklin, William H. Rhodes, David Scerbak
  • Publication number: 20090011924
    Abstract: A composition is provided that includes a plurality of calcined particles of terbium aluminum oxide having a mean particle domain size of between 30 and 600 nanometers. A translucent article having a surface includes polycrystalline terbium aluminum garnet having a mean grain size from 1 to 10 microns and light scattering inclusions of aluminum-rich oxide and/or terbium-rich oxide that are present at less than 2 surface area percent of the surface. A process for forming such an article involves sintering the above provided composition at a temperature between 1500° C. and 1700° C. to yield a sintered article. The article has improved translucency and even transparency as sintering is performed under vacuum at a temperature between 1610° C. and 1680° C. Hot isostatic pressing alone or in combination with article polishing also improves article translucency.
    Type: Application
    Filed: September 15, 2008
    Publication date: January 8, 2009
    Inventors: Yin Tang, Anthony C. Sutorik, Long Nguyen, Tom Hinklin, William H. Rhodes, David Scerbak
  • Patent number: 7456122
    Abstract: Polycrystalline alumina and methods for manufacturing polycrystalline alumina exhibiting improved transmission in the infrared region. In one embodiment, the percent real in-line transmittance is within about 2% of sapphire at selected wavelengths. In one or more embodiments, polycrystalline articles exhibit improved mechanical properties such as thermal shock resistance and hardness, which may find use in armor applications.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: November 25, 2008
    Assignee: CeraNova Corporation
    Inventors: William H. Rhodes, Mark V. Parish, Marina R. Pascucci
  • Patent number: 7427577
    Abstract: A composition is provided that includes a plurality of calcined particles of terbium aluminum oxide having a mean particle domain size of between 30 and 600 nanometers. A translucent article having a surface includes polycrystalline terbium aluminum garnet having a mean grain size from 1 to 10 microns and light scattering inclusions of aluminum-rich oxide and/or terbium-rich oxide that are present at less than 2 surface area percent of the surface. A process for forming such an article involves sintering the above provided composition at a temperature between 1500° C. and 1700° C. to yield a sintered article. The article has improved translucency and even transparency as sintering is performed under vacuum at a temperature between 1610° C. and 1680° C. Hot isostatic pressing alone or in combination with article polishing also improves article translucency.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: September 23, 2008
    Inventors: Yin Tang, Anthony C. Sutorik, Long Nguyen, Tom Hinklin, William H. Rhodes, David Scerbak
  • Patent number: 5725827
    Abstract: Alumina arc tube sealing members including a highly pure, fine alumina doped with yttrium oxide, and magnesium oxide. The sealing members are used in the formation of sintered hermetic seals to a green, prefired, or fully sintered translucent alumina arc tube and niobium electrical feedthrough assemblies with or without the use of sealing frits or brazing alloys.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: March 10, 1998
    Assignee: Osram Sylvania Inc.
    Inventors: William H. Rhodes, Alfred E. Feuersanger, Rodrigue Thibodeau
  • Patent number: 5426343
    Abstract: Alumina arc tube sealing members including a highly pure, fine alumina doped with yttrium oxide, and magnesium oxide. The sealing members are used in the formation of sintered hermetic seals to a green, prefired, or fully sintered translucent alumina arc tube and niobium electrical feedthrough assemblies with or without the use of sealing frits or brazing alloys.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: June 20, 1995
    Assignee: GTE Products Corporation
    Inventors: William H. Rhodes, Alfred E. Feuersanger, Rodrigue Thibodeau
  • Patent number: 5095246
    Abstract: A process for sealing of niobium-ceramic through-wall assemblies for ceramic or metal vessels for high temperature and high pressure or vacuum applications, for example an electrical feedthrough and sealable fill opening in an alumina arc tube for a high intensity discharge (HID) lamp. The process produces a fritless hermetic seal while maintaining the ductility of the niobium components. The niobium-ceramic through-wall assembly includes an axially bored alumina or yttria sealing means having a ductile niobium throughpiece close fitted to and extending through the bore. The throughpiece is preferably essentially pure niobium, but may contain up to about 2% zirconium. The assembly is fired at about 1400.degree.-2000.degree. C. in a pure oxygen- and hydrogen-free (<5 ppm each) inert, preferably flowing, atmosphere or vacuum for a time sufficient to form a hermetic seal between the throughpiece and the sealing means. The fired assembly is then cooled to below 250.degree. C.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: March 10, 1992
    Assignee: GTE Laboratories Incorporated
    Inventors: Alfred E. Feuersanger, William H. Rhodes
  • Patent number: 5057048
    Abstract: A process for sealing of niobium-ceramic through-wall assemblies for ceramic or metal vessels for high temperature and high pressure or vacuum applications, for example an electrical feedthrough and sealable fill opening in an alumina arc tube for a high intensity discharge (HID) lamp. The process produces a fritless hermetic seal while maintaining the ductility of the niobium components. The niobium-ceramic through-wall assembly includes an axially bored alumina or yttria sealing means having a ductile niobium throughpiece close fitted to and extending through the bore. The throughpiece is preferably essentially pure niobium, but may contain up to about 2% zirconium. The assembly is fired at about 1400.degree.-2000.degree. C. in a pure oxygen- and hydrogen-free (<5 ppm each) inert, preferably flowing, atmosphere or vacuum for a time sufficient to form a hermetic seal between the throughpiece and the sealing means. The fired assembly is then cooled to below 250.degree. C.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: October 15, 1991
    Assignee: GTE Laboratories Incorporated
    Inventors: Alfred E. Feuersanger, William H. Rhodes
  • Patent number: 4948538
    Abstract: A method of making a translucent alumina article is described. The method comprises the following steps:Step 1 - An alumina powder and a sintering aid are mixed in a liquid for a period sufficient to form a homogeneous slurry.Step 2 - The homogeneous slurry from Step 1 is dried remove the liquid to form a dried powder.Step 3 - The dried powder is shaped to form a compacted green body.Step 4 - The compacted green body from Step 3 is heated at a temperature equal to or less than 500.degree. C. and for a period sufficient to form a compacted green body having a density of at least 30% of theoretical density.Step 5 - The compacted green body having a density of at least 30% of theoretical density from Step 4 is heated at a temperature from about 800.degree. C. to about 1300.degree. C. in an oxygen containing atmosphere for a period sufficient to impart green strength to said compacted green body to form a prefired compacted green body.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: August 14, 1990
    Assignee: GTE Laboratories Incorporated
    Inventors: George C. Wei, William H. Rhodes
  • Patent number: 4797238
    Abstract: An improved process for producing a translucent polycrystalline alumina body comprising rapid-sintering a prefired compacted green body of alumina of predetermined shape is disclosed. The green body of alumina includes alumina doped with one or more sintering aids. Rapid sintering in accordance with the method of the present invention comprises the steps of raising the temperature of the prefired compacted green body of predetermined shape up to maximum sintering temperature at a heating rate greater than or equal to about 0.1.degree. C./second and less than the rate at which the green body experiences thermal shock; and heating the green body at the maximum sintering temperature for a period of time sufficient to produce a translucent polycrystalline alumina body. The rapid sintering is carried out under a flowing gas mixture of nitrogen and at least about 2.5 volume percent hydrogen.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: January 10, 1989
    Assignees: GTE Laboratories Incorporated, GTE Product Corp.
    Inventors: William H. Rhodes, George C. Wei, George A. Fryburg
  • Patent number: 4762655
    Abstract: An improved process for producing a translucent polycrystalline alumina body comprising sintering a prefired compacted green body of alumina of predetermined shape is disclosed. The green body of alumina includes alumina doped with one or more sintering aids. The method of the present invention comprises sintering the prefired compacted green body of predetermined shape at a maximum sintering temperature in an atmosphere containing nitrogen and an amount of hydrogen greater than or equal to about 2.5 volume percent and less than 75 volume percent for a period of time sufficient to produce a translucent polycrystalline alumina body.
    Type: Grant
    Filed: November 27, 1985
    Date of Patent: August 9, 1988
    Assignee: GTE Laboratories Incorporated
    Inventors: William H. Rhodes, George C. Wei, George A. Fryburg
  • Patent number: 4545799
    Abstract: A high pressure arc lamp has a ceramic arc tube envelope. A niobium feedthrough positions electrodes within the tube. A ceramic insert at each end of the tube forms a direct high temperature hermetic seal with the niobium feedthrough and the ceramic tube without the use of frits or brazing.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: October 8, 1985
    Assignees: GTE Laboratories Incorporated, GTE Products Corporation
    Inventors: William H. Rhodes, Caryl S. Pitt, John J. Gutta
  • Patent number: 4323545
    Abstract: The invention is directed to a transparent alumina material and a method of preparing this material.The material is characterized as a dense primary recrystallized polycrystalline structure having a degree of preferred crystal orientation. The material is transparent to visible and infrared light and quantitative values are given.The transparent alumina covered by this invention is made by means of hot forging and an annealing process for powders or dense compacts of high-purity alumina.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: April 6, 1982
    Assignee: Avco Corporation
    Inventors: David J. Sellers, William H. Rhodes, Thomas Vasilos
  • Patent number: 4206492
    Abstract: An electric gas ignitor is disclosed having a gas igniting fiber comprising a core of conductive refractory material and an outer, high strength, oxidation resistant coating. One aspect of the invention concerns a primary current path defined by at least a portion of the fiber core and comprising a material having a highly uniform resistance per unit length. A substantially uniform temperature distribution is thereby promoted on the fiber surface and the formation of localized "hot spots" is inhibited. The primary current path is preferably an anisotropic material having a preferred crystal orientation which uniformly conducts electricity along the fiber length.A second aspect of the invention is directed to the inclusion of a diffusion-barrier material between the fiber core and the oxidation-resistant coating to prevent diffusion of the core and coating, which changes the fiber operating temperature and decreases its operating life.
    Type: Grant
    Filed: February 17, 1976
    Date of Patent: June 3, 1980
    Assignee: GTE Laboratories Incorporated
    Inventors: William H. Rhodes, Paul O. Haugsjaa, John C. Gustafson
  • Patent number: 4174973
    Abstract: An article of manufacture comprising a substantially transparent high density polycrystalline yttria-based body consisting essentially of yttria and from 0.1 to 5 wt. % MgO or from 0.1 to 5 wt. % MgAl.sub.2 O.sub.4.Transparent yttria-based bodies according to this invention are particularly useful as envelopes for high pressure sodium vapor lamps.
    Type: Grant
    Filed: January 29, 1979
    Date of Patent: November 20, 1979
    Assignee: GTE Laboratories Incorporated
    Inventors: William H. Rhodes, F. Joseph Reid
  • Patent number: 4166831
    Abstract: An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 0.01 to 5 wt. % alumina.A method for preparing the transparent yttria doped with alumina is also provided comprising admixing alumina or a precursor thereof with yttria or a precursor thereof, drying the admixed powders, calcining the admixed powders and pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for about 1/4 to six hours at a temperature above the eutectic temperature at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.
    Type: Grant
    Filed: March 9, 1978
    Date of Patent: September 4, 1979
    Assignee: GTE Laboratories Incorporated
    Inventors: William H. Rhodes, F. Joseph Reid
  • Patent number: 4147744
    Abstract: An article of manufacture is provided comprising a substantially transparent high density polycrystalline yttria-base body consisting essentially of yttria and from about 6 to 14 mole percent lanthana.A method for preparing the transparent yttria doped with lanthana is also provided comprising admixing or co-precipitating lanthana or a precursor thereof with yttria or a precursor thereof, washing, drying and screening the mixture, calcining the admixed or co-precipitated powders, pressing the calcined powders into a desired shape and thereafter sintering the shaped powder for from about 1/6 to 6 hours at a temperature above the H-phase transition and for from about 1/2 to 6 hours at a temperature below the H to C phase transition, said sintering being effected at a sufficiently low oxygen atmosphere to prevent oxidative contaminants.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: April 3, 1979
    Assignee: GTE Laboratories Incorporated
    Inventor: William H. Rhodes