Patents Assigned to Global Tungsten & Powders Corp.
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Patent number: 11111563Abstract: Composites comprising various fractions of ultra coarse (UC) tungsten carbide (WC) and cast carbide (CC), along with composites comprising fractions of UC-WC and CC having various particle size and showing an improved strength and erosion resistance, and methods for making the inventive composites.Type: GrantFiled: September 10, 2018Date of Patent: September 7, 2021Assignee: GLOBAL TUNGSTEN & POWDERS CORP.Inventors: Ravi K. Enneti, Kevin Prough, Keith Newman
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Patent number: 10584404Abstract: Matrix powder material and composites thereof, having improved strength, wear resistance, and abrasion resistance.Type: GrantFiled: November 11, 2016Date of Patent: March 10, 2020Assignee: Global Tungsten & Powders Corp.Inventors: Ravi K. Enneti, Kevin Prough
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Patent number: 10287213Abstract: In one aspect, the invention relates to compositions useful in frangible projectiles, methods of making same, and articles comprising same This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.Type: GrantFiled: May 8, 2012Date of Patent: May 14, 2019Assignee: Global Tungsten and Powders Corp.Inventors: Martin Gerardo Perez, Eric Timothy Riley, Erika Vanessa Esquivel
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Patent number: 8557143Abstract: An electroluminescent phosphor comprising ZnS:Mn is disclosed. Also disclosed are ZnS:Mn electroluminescent phosphors that are free of or substantially free of copper, and/or wherein the phosphor has a D50 size of less than about 5 ?m. In addition, a method for preparing a ZnS:Mn phosphor is disclosed, comprising the steps of contacting at least a portion of each of a first solution comprising a Zn2+ compound, a manganese source, and a second solution comprising a S2? source agent; and then heating the mixture at a temperature and for a time sufficient to form a phosphor.Type: GrantFiled: March 11, 2009Date of Patent: October 15, 2013Assignee: Global Tungsten and Powders Corp.Inventors: Xianzhong Chen, Shellie Kaye Northrop, Chen-Wen Fan
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Patent number: 8298666Abstract: An electroluminescent (EL) phosphor is described wherein each individual phosphor particle is encapsulated in an inorganic coating, preferably aluminum oxyhydroxide. The encapsulated phosphor shows an extreme insensitivity to atmospheric moisture and suffers only minor loss of initial brightness in lamps. The method of applying the coating is a hybrid process, which involves EL phosphor particles first being coated with a thin inorganic film using an atomic layer deposition (ALD) method in a fluidized bed wherein the precursors are introduced sequentially in repeated cycles, subsequently followed by an additional coating layer applied by a chemical vapor deposition (CVD) method in which the precursors are introduced simultaneously.Type: GrantFiled: January 12, 2007Date of Patent: October 30, 2012Assignee: Global Tungsten & Powders Corp.Inventors: Chen-Wen Fan, Tuan A. Dang, Joan M. Coveleskie, Frank A. Schwab, Dale E. Benjamin, David C. Sheppeck
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Patent number: 8278816Abstract: An electroluminescent lamp having a high color rendering index (CRI) can be made using a phosphor blend comprising a mixture of an electroluminescent phosphor and an europium-activated alkaline earth silicon nitride phosphor, wherein the electroluminescent phosphor is selected from a blue-emitting electroluminescent phosphor, a blue-green-emitting electroluminescent phosphor, or a combination thereof. Preferably, the lamp exhibits a CRI of at least about 75, and, more preferably, at least about 80. A preferred blend contains from about 10% to about 20% by weight of the europium-activated alkaline earth silicon nitride phosphor.Type: GrantFiled: September 30, 2004Date of Patent: October 2, 2012Assignee: Global Tungsten & Powders Corp.Inventor: Chung-nin Chau
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Patent number: 8057962Abstract: The catalyst of this invention is a non-stoichiometric tungsten compound, H0.53WO3, which may be used as both the anode and cathode electrocatalyst for acid-style low-temperature fuel cells. A fuel cell using the tungsten-based electrocatalyst as both the anode and cathode has been constructed and operated with a hydrogen fuel and an air oxidant.Type: GrantFiled: March 25, 2004Date of Patent: November 15, 2011Assignee: Global Tungsten & Powders Corp.Inventor: Joel B. Christian
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Patent number: 7988760Abstract: There is described a method of making a nanocrystalline tungsten powder that comprises: (a) heating a tungsten-containing material in a reducing atmosphere at an intermediate temperature of from about 600° C. to about 700° C. for an intermediate time period; the tungsten-containing material being selected from ammonium paratungstate, ammonium metatungstate or a tungsten oxide; and (b) increasing the temperature to a final temperature of about 800° C. to about 1000° C. for a final time period.Type: GrantFiled: February 25, 2008Date of Patent: August 2, 2011Assignee: Global Tungsten & Powders Corp.Inventors: Hans-Joachim Lunk, Henry J. Stevens
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Patent number: 7989064Abstract: The coating the tungsten powder particles with a ceramic barrier suppresses the leachability of tungsten in aqueous media. Preferably, the ceramic coating substantially encapsulates each particle of tungsten and has a thickness of at least about 30 nm and, more preferable, from about 200 nm to about 500 nm. Examples of ceramic coatings that may be used include, but are not limited to, aluminum oxide (alumina), aluminum oxyhydroxide (AlOOH), zirconium oxide (zirconia), cerium oxide (ceria), hafnium oxide (hafnia), and magnesium oxide (magnesia).Type: GrantFiled: January 9, 2006Date of Patent: August 2, 2011Assignee: Global Tungsten & Powders Corp.Inventors: Hans-Joachim Lunk, Ricky D. Morgan, Henry J. Stevens, Dale E. Benjamin, Tuan A. Dang, Timothy A. Frisk
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Patent number: 7833437Abstract: The present invention is an electroluminescent phosphor wherein each individual phosphor particle is encapsulated in an inorganic coating applied by an atomic layer deposition (ALD) coating method. In a preferred embodiment, the coating is aluminum oxyhydroxide. The encapsulated phosphor shows an extreme insensitivity to atmospheric moisture and suffers only minor loss of initial brightness in lamps.Type: GrantFiled: January 12, 2007Date of Patent: November 16, 2010Assignee: Global Tungsten & Powders Corp.Inventors: Chen-Wen Fan, Tuan A. Dang, Joan M. Coveleskie, Frank A. Schwab, Dale E. Benjamin, David C. Sheppeck
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Patent number: 7749405Abstract: A white-emitting electroluminescent lamp is provided that uses a phosphor blend comprising a mixture of particles of an electroluminescent phosphor and particles of an europium-activated alkaline earth phosphor having the general formula Sr1-xCaxS:Eu where 0?x?1, wherein the electroluminescent phosphor is selected from a blue-emitting electroluminescent phosphor, a blue-green-emitting electroluminescent phosphor, or a combination thereof. A preferred blend contains from about 5% to about 20% by weight of the europium-activated alkaline earth phosphor.Type: GrantFiled: November 11, 2005Date of Patent: July 6, 2010Assignee: Global Tungsten & Powders Corp.Inventors: Judy A. Belinski-Wolfe, Chung Nin Chau
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Patent number: 7727927Abstract: Activation of a tungsten-containing catalyst using water in a PEM-type fuel cell is described as well as cathode operation of the tungsten-containing catalyst.Type: GrantFiled: October 4, 2005Date of Patent: June 1, 2010Assignee: Global Tungsten & Powders Corp.Inventor: Joel B. Christian
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Patent number: 7452483Abstract: A phosphor blend for an electroluminescent lamp is described that comprises a green-emitting electroluminescent phosphor and a red-emitting photoluminescent phosphor, the blend exhibiting an x color coordinate from 0.220 to 0.350 and a y color coordinate from 0.450 to 0.475 when stimulated by an electric field.Type: GrantFiled: August 3, 2006Date of Patent: November 18, 2008Assignee: Global Tungsten & Powders Corp.Inventors: Judy A. Belinski-Wolfe, Chung Nin Chau, Thomas A. Wolfe