Patents by Inventor Harry D. Martin
Harry D. Martin 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: 6830637Abstract: A large-diameter tungsten-lanthana rod having an elongated grain structure substantially parallel to the longitudinal axis of the rod is described. The large diameter rod is produced by rolling at a temperature greater than 1400° C. and less than 1700° C. to achieve at least about a 40% reduction in cross-sectional area. The high strength of the longitudinally elongated grain structure is desirable for applications such as rocket nozzles.Type: GrantFiled: May 31, 2002Date of Patent: December 14, 2004Assignee: Osram Sylvania Inc.Inventors: Ricky D. Morgan, Thomas J. Dixon, Harry D. Martin, III
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Publication number: 20040206429Abstract: A large-diameter tungsten-lanthana rod having an elongated grain structure substantially parallel to the longitudinal axis of the rod is described. The large diameter rod is produced by rolling at a temperature greater than 1400° C. and less than 1700° C. to achieve at least about a 40% reduction in cross-sectional area. The high strength of the longitudinally elongated grain structure is desirable for applications such as rocket nozzles.Type: ApplicationFiled: January 29, 2004Publication date: October 21, 2004Inventors: Ricky D. Morgan, Thomas J. Dixon, Harry D. Martin
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Publication number: 20030221755Abstract: A large-diameter tungsten-lanthana rod having an elongated grain structure substantially parallel to the longitudinal axis of the rod is described. The large diameter rod is produced by rolling at a temperature greater than 1400° C. and less than 1700° C. to achieve at least about a 40% reduction in cross-sectional area. The high strength of the longitudinally elongated grain structure is desirable for applications such as rocket nozzles.Type: ApplicationFiled: May 31, 2002Publication date: December 4, 2003Applicant: OSRAM SYLVANIA Inc.Inventors: Ricky D. Morgan, Thomas J. Dixon, Harry D. Martin
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Patent number: 6129890Abstract: It has been discovered that potassium retention in NS tungsten processing may be improved by double doping tungsten blue oxide (TBO) prior to reduction. The novel `double-doping` process consists of dry doping standard singly doped K--Al--Si TBO with potassium nitrate, KNO.sub.3, followed by the standard reduction, acid washing, sintering, rolling and drawing steps. In another aspect, the novel method includes an aqueous extraction of heteropolytungstate anion [SiW.sub.11 O.sub.39 ].sup.8- from a sample of the singly doped tungsten blue oxide to predict potassium retention.Type: GrantFiled: September 7, 1999Date of Patent: October 10, 2000Assignee: Osram Sylvania Inc.Inventors: Hans-Joachim Lunk, Henry J. Stevens, Thomas J. Patrician, Harry D. Martin, III
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Patent number: 5742891Abstract: A wire for fabrication of a vibration resistant filament for an incandescent lamp. The wire includes about 0.05-1.00 weight percent lanthanum oxide dispersed in a tungsten matrix and has a microstructure including stringers of fine particles of lanthanum oxide extending parallel to the wire axis. During primary recrystallization of a vibration resistant lamp filament from the filament wire, the stringers produce a microstructure in the filament exhibiting sufficient grain boundary segments extending generally axially along the length of the filament to render the filament resistant to vibration. A method for producing a vibration resistant filament for an incandescent lamp is also disclosed.Type: GrantFiled: April 4, 1996Date of Patent: April 21, 1998Assignee: Osram Sylvania Inc.Inventors: Thomas J. Patrician, Harry D. Martin, III
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Patent number: 5604321Abstract: A wire for fabrication of a vibration resistant filament for an incandescent lamp. The wire includes about 0.05-1.00 weight percent lanthanum oxide dispersed in a tungsten matrix and has a microstructure including stringers of fine particles of lanthanum oxide extending parallel to the wire axis. During primary recrystallization of a vibration resistant lamp filament from the filament wire, the stringers produce a microstructure in the filament exhibiting sufficient grain boundary segments extending generally axially along the length of the filament to render the filament resistant to vibration. A method for producing a vibration resistant filament for an incandescent lamp is also disclosed.Type: GrantFiled: July 26, 1995Date of Patent: February 18, 1997Assignee: OSRAM Sylvania Inc.Inventors: Thomas J. Patrician, Harry D. Martin, III
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Patent number: 5590386Abstract: In a method of making alloy of tungsten and lanthana, lanthanum hydroxide is blended with tungsten metal powder, the mixture is pressed to form a pressed ingot, optionally presintered, and sintered to form the alloy. The use of lanthanum hydroxide as the source of the lanthana dopant allows the pressed or presintered ingots to be stored in air prior to sintering for prolonged periods without becoming degraded from exposure to atmospheric moisture.Type: GrantFiled: July 26, 1995Date of Patent: December 31, 1996Assignee: Osram Sylvania Inc.Inventors: Thomas J. Patrician, Harry D. Martin, III
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Patent number: 5120250Abstract: The center electrode of an ignition plug is a unitary cylindrical tungsten rod in which the outer peripheral portion thereof has a higher work function than the core portion.Type: GrantFiled: December 30, 1991Date of Patent: June 9, 1992Assignee: GTE Products CorporationInventors: Thomas J. Patrician, William C. Fulkerson, Harry D. Martin, III
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Patent number: 5121026Abstract: The center electrode of an ignition plug is a unitary cylindrical tungsten rod in which the outer peripheral portion thereof has a higher work function than the core portion.Type: GrantFiled: October 25, 1990Date of Patent: June 9, 1992Assignee: GTE Products CorporationInventors: Thomas J. Patrician, William C. Fulkerson, Harry D. Martin, III
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Patent number: 4859236Abstract: 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: GrantFiled: April 25, 1988Date of Patent: August 22, 1989Assignee: GTE Products CorporationInventors: Thomas J. Patrician, Joseph E. Ritsko, Harry D. Martin, III
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Patent number: 4717538Abstract: A molybdenum-tungsten-titanium-zirconium-carbon alloy system is disclosed having a composition in percent by weight of from about 0.01 to about 0.15 carbon, from about 0.06 to about 0.20 zirconium, from about 0.40 to about 0.75 titanium, from about 10 to about 60 tungsten, and the balance molybdenum.Type: GrantFiled: November 28, 1986Date of Patent: January 5, 1988Assignee: GTE Products CorporationInventors: Thomas J. Patrician, Gene T. Schaeffer, Harry D. Martin, III
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Patent number: 4670216Abstract: A three step process in which a metal alloy selected from a tungsten based alloy and molybdenum based alloys is provided to prevent the decarbonization of the alloys. The process involves a three step sintering process wherein the atmosphere during the initial heating step is a mixture of carbon monoxide and hydrogen, thereafter at a intermediate temperature range the atmosphere is hydrogen and a final heating step at a elevated temperature is employed and the atmosphere is a mixture of inert gas and a source of carbon.Type: GrantFiled: September 25, 1986Date of Patent: June 2, 1987Assignee: GTE Products CorporationInventors: Thomas J. Patrician, Vito P. Sylvester, Harry D. Martin, III
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Patent number: 4307966Abstract: Printer wire assemblies for dot matrix printers are characterized by a copper layer on the tungsten wire extending beyond the base portion inside the pin socket, to protect the wire from the embrittling effects of brazing, by braze-forming layers on the copper layer and by a blind-hole pin socket, to enable ease of assembly and braze-bonds of uniformly adequate mechanical strength.Type: GrantFiled: December 11, 1979Date of Patent: December 29, 1981Assignee: GTE Products CorporationInventors: James R. Spencer, Harry D. Martin, Jr.