Patents by Inventor Arthur J. Moorhead
Arthur J. Moorhead 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: 6375877Abstract: A gelcasting method of making an internally graded article alternatively includes the steps of: preparing a slurry including a least two different phases suspended in a gelcasting solution, the phases characterized by having different settling characteristics; casting the slurry into a mold having a selected shape; allowing the slurry to stand for a sufficient period of time to permit desired gravitational fractionation in order to achieve a vertical compositional gradient in the molded slurry; gelling the slurry to form a solid gel while preserving the vertical compositional gradient in the molded slurry; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying along the vertical direction because of the compositional gradient in the molded slurry.Type: GrantFiled: April 24, 2001Date of Patent: April 23, 2002Assignee: UT Battelle, LLCInventors: Robert J. Lauf, Paul A. Menchhofer, Claudia A. Walls, Arthur J. Moorhead
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Publication number: 20010033039Abstract: A gelcasting method of making an internally graded article alternatively includes the steps of: preparing a slurry including a least two different phases suspended in a gelcasting solution, the phases characterized by having different settling characteristics; casting the slurry into a mold having a selected shape; allowing the slurry to stand for a sufficient period of time to permit desired gravitational fractionation in order to achieve a vertical compositional gradient in the molded slurry; gelling the slurry to form a solid gel while preserving the vertical compositional gradient in the molded slurry; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying along the vertical direction because of the compositional gradient in the molded slurry.Type: ApplicationFiled: April 24, 2001Publication date: October 25, 2001Inventors: Robert J. Lauf, Paul A. Menchhofer, Claudia A. Walls, Arthur J. Moorhead
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Patent number: 6110420Abstract: A composite structure and method for manufacturing same, the composite structure being comprised of metal particles and an inorganic bonding media. The method comprises the steps of coating particles of a metal powder with a thin layer of an inorganic bonding media selected from the group of powders consisting of a ceramic, glass, and glass-ceramic. The particles are assembled in a cavity and heat, with or without the addition of pressure, is thereafter applied to the particles until the layer of inorganic bonding media forms a strong bond with the particles and with the layer of inorganic bonding media on adjacent particles. The resulting composite structure is strong and remains cohesive at high temperatures.Type: GrantFiled: August 3, 1999Date of Patent: August 29, 2000Assignee: UT-Battelle, LLCInventors: Arthur J. Moorhead, Hyoun-Ee Kim
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Patent number: 6110855Abstract: A process for strengthening aluminum based ceramics is provided. A gaseous atmosphere consisting essentially of silicon monoxide gas is formed by exposing a source of silicon to an atmosphere consisting essentially of hydrogen and a sufficient amount of water vapor. The aluminum based ceramic is exposed to the gaseous silicon monoxide atmosphere for a period of time and at a temperature sufficient to produce a continuous, stable silicon-containing film on the surface of the aluminum based ceramic that increases the strength of the ceramic.Type: GrantFiled: March 31, 1998Date of Patent: August 29, 2000Assignee: The United States of America as represented by the United States Department of EnergyInventors: Arthur J. Moorhead, Hyoun-Ee Kim
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Patent number: 6051324Abstract: A composite structure and method for manufacturing same, the composite structure being comprised of metal particles and an inorganic bonding media. The method comprises the steps of coating particles of a metal powder with a thin layer of an inorganic bonding media selected from the group of powders consisting of a ceramic, glass, and glass-ceramic. The particles are assembled in a cavity and heat, with or without the addition of pressure, is thereafter applied to the particles until the layer of inorganic bonding media forms a strong bond with the particles and with the layer of inorganic bonding media on adjacent particles. The resulting composite structure is strong and remains cohesive at high temperatures.Type: GrantFiled: September 15, 1997Date of Patent: April 18, 2000Assignee: Lockheed Martin Energy Research CorporationInventors: Arthur J. Moorhead, Hyoun-Ee Kim
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Patent number: 5935722Abstract: A laminated composite structure of alternating metal powder layers, and layers formed of an inorganic bonding media powder, and a method for manufacturing same are discosed. The method includes the steps of assembling in a cavity alternating layers of a metal powder and an inorganic bonding media of a ceramic, glass, and glass-ceramic. Heat, with or without pressure, is applied to the alternating layers until the particles of the metal powder are sintered together and bonded into the laminated composite structure by the layers of sintered inorganic bonding media to form a strong composite structure. The method finds particular application in the manufacture of high performance magnets wherein the metal powder is a magnetic alloy powder.Type: GrantFiled: September 3, 1997Date of Patent: August 10, 1999Assignee: Lockheed Martin Energy Research CorporationInventors: Arthur J. Moorhead, Hyoun-Ee Kim
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Patent number: 5786666Abstract: In a microwave tube, an improved collector surface coating comprises a porous carbon composite material, preferably a carbon-bonded carbon fiber composite having a bulk density less than about 2 g/cc. Installation of the coating is readily adaptable as part of the tube manufacturing process.Type: GrantFiled: March 22, 1996Date of Patent: July 28, 1998Assignee: Lockheed Martin Energy Systems, Inc.Inventors: Robert J. Lauf, April D. McMillan, Arvid C. Johnson, Arthur J. Moorhead
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Patent number: 5742211Abstract: A billet of low-density carbon-bonded carbon fiber (CBCF) composite is machined into a desired attenuator or load element shape (usually tapering). The CBCF composite is used as a free-standing load element or, preferably, brazed to the copper, brass or aluminum components of coaxial transmission lines or microwave waveguides. A novel braze method was developed for the brazing step. The resulting attenuator and/or load devices are robust, relatively inexpensive, more easily fabricated, and have improved performance over conventional graded-coating loads.Type: GrantFiled: March 22, 1996Date of Patent: April 21, 1998Assignee: Lockheed Martin Energy Systems, Inc.Inventors: Robert J. Lauf, April D. McMillan, Arvid C. Johnson, Carl A. Everleigh, Arthur J. Moorhead
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Patent number: 5648180Abstract: A method for joining carbon-carbon composites to metals by brazing. Conventional brazing of recently developed carbon-bonded carbon fiber (CBCF) material to a metal substrate is limited by the tendency of the braze alloy to "wick" into the CBCF composite rather than to form a strong bond. The surface of the CBCF composite that is to be bonded is first sealed with a fairly dense carbonaceous layer achieved by any of several methods. The sealed surface is then brazed to the metal substrate by vacuum brazing with a Ti-Cu-Be alloy.Type: GrantFiled: March 22, 1996Date of Patent: July 15, 1997Assignee: Lockheed Martin Energy Systems, Inc.Inventors: Robert J. Lauf, April D. McMillan, Arthur J. Moorhead
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Patent number: 5476622Abstract: A method and apparatus for the production of articles made of a particle-based material; e.g., ceramics and sintered metals. In accordance with the invention, a thermally settable slurry containing a relatively high concentration of the particles is conveyed through an elongate flow area having a desired cross-sectional configuration. The slurry is heated as it is advanced through the flow area causing the slurry to set or harden in a shape which conforms to the cross-sectional configuration of the flow area. The material discharges from the flow area as a self-supporting solid of near net final dimensions. The article may then be sintered to consolidate the particles and provide a high density product.Type: GrantFiled: June 12, 1992Date of Patent: December 19, 1995Assignee: Martin Marietta Energy Systems, Inc.Inventors: Arthur J. Moorhead, Paul A. Menchhofer
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Patent number: 5171555Abstract: A transparent, strong CsI alloy havign additions of monovalent iodides. Although the perferred iodide is AgI, RbI and CuI additions also contribute to an improved polycrystalline CsI alloy.Type: GrantFiled: January 24, 1991Date of Patent: December 15, 1992Assignee: The United States of America as represented by the United States Department of EnergyInventors: Hyoun-Ee Kim, Arthur J. Moorhead
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Patent number: 4812280Abstract: A process for manufacturing large, fully dense, high purity TiB.sub.2 articles by pressing powders with a sintering aid at relatively low temperatures to reduce grain growth. The process requires stringent temperature and pressure applications in the hot-pressing step to ensure maximum removal of sintering aid and to avoid damage to the fabricated article or the die.Type: GrantFiled: April 17, 1986Date of Patent: March 14, 1989Assignee: The United States of America as represented by the Department of EnergyInventors: Arthur J. Moorhead, E. S. Bomar, Paul F. Becher
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Patent number: 4735866Abstract: A method of joining ceramics and metals to themselves and to one another at about 800.degree. C. is described using a brazing filler metal consisting essentially of 35 to 50 at. % copper, 40 to 50 at. % silver, 1 to 15 at. % titanium, and 2 to 8 at. % tin. This method produces strong joints that can withstand high service temperatures and oxidizing environments.Type: GrantFiled: July 28, 1986Date of Patent: April 5, 1988Assignee: The United States of America as represented by the United States Department of EnergyInventor: Arthur J. Moorhead
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Patent number: 4698271Abstract: A method of joining ceramics and metals to themselves and to one another is described using a brazing filler metal consisting essentially of 35 to 50 atomic percent copper, 15 to 50 atomic percent silver and 10 to 45 atomic percent titanium. This method produces strong joints that can withstand high service temperatures and oxidizing environments.Type: GrantFiled: December 30, 1985Date of Patent: October 6, 1987Assignee: The United States of America as represented by the Department of EnergyInventor: Arthur J. Moorhead
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Patent number: 4596354Abstract: A method of joining ceramics and metals to themselves and to one another is described using essentially pure trinickel aluminide and trinickel aluminide containing small amounts of carbon. This method produces strong joints that can withstand high service temperatures and oxidizing environments.Type: GrantFiled: July 3, 1985Date of Patent: June 24, 1986Assignee: The United States of America as represented by the United States Department of EnergyInventor: Arthur J. Moorhead
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Patent number: H298Abstract: A method of joining ceramics and metals to themselves and to one another is escribed using essentially pure trinickel aluminide and trinickel aluminide containing small amounts of carbon. This method produces strong joints that can withstand high service temperatures and oxidizing environments.Type: GrantFiled: March 11, 1986Date of Patent: July 7, 1987Assignee: The United States of America as represented by the Department of EnergyInventor: Arthur J. Moorhead
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Patent number: H301Abstract: A method of joining ceramics and metals to themselves and to one another is escribed using essentially pure trinickel aluminide and trinickel aluminide containing small amounts of carbon. This method produces strong joints that can withstand high service temperatures and oxidizing environments.Type: GrantFiled: March 11, 1986Date of Patent: July 7, 1987Assignee: The United States of America as represented by the Department of EnergyInventor: Arthur J. Moorhead