Patents by Inventor Stephen R. Foltyn
Stephen R. Foltyn 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: 8088503Abstract: A superconducting article includes a substrate having an untextured metal surface; an untextured barrier layer of La2Zr2O7 or Gd2Zr2O7 supported by and in contact with the surface of the substrate; a biaxially textured buffer layer supported by the untextured barrier layer; and a biaxially textured superconducting layer supported by the biaxially textured buffer layer. Moreover, a method of forming a buffer layer on a metal substrate includes the steps of: providing a substrate having an untextured metal surface; coating the surface of the substrate with a barrier layer precursor; converting the precursor to an untextured barrier layer; and depositing a biaxially textured buffer layer above and supported by the untextured barrier layer.Type: GrantFiled: January 30, 2009Date of Patent: January 3, 2012Assignees: UT-Battelle, LLC, The Regents of the University of CaliforniaInventors: Mariappan Parans Paranthaman, Srivatsan Sathyamurthy, Tolga Aytug, Paul N Arendt, Liliana Stan, Stephen R Foltyn
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Patent number: 8003571Abstract: A composite structure is provided including a base substrate, an IBAD oriented material upon the base substrate, and a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the IBAD oriented material. Additionally, an article is provided including a base substrate, an IBAD oriented material upon the base substrate, a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the IBAD oriented material, and a thick film upon the cubic metal oxide material. Finally, a superconducting article is provided including a base substrate, an IBAD oriented material upon the base substrate, a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the IBAD oriented material, and an yttrium barium copper oxide material upon the cubic metal oxide material.Type: GrantFiled: August 7, 2007Date of Patent: August 23, 2011Assignee: Los Alamos National Security, LLCInventors: Liliana Stan, Quanxi Jia, Stephen R. Foltyn
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Patent number: 7737087Abstract: A process and composition of matter are provided and involve flux pinning in thin films of high temperature superconductive oxides such as YBCO by inclusion of particles including barium and a group 4 or group 5 metal, such as zirconium, in the thin film.Type: GrantFiled: July 27, 2004Date of Patent: June 15, 2010Assignee: Los Alamos National Security, LLCInventors: Judith L. Driscoll, Stephen R. Foltyn
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Patent number: 7737085Abstract: Articles are provided including a base substrate having a layer of an IBAD oriented material thereon, and, a layer of barium-containing material selected from the group consisting of barium zirconate, barium hafnate, barium titanate, barium strontium titanate, barium dysprosium zirconate, barium neodymium zirconate and barium samarium zirconate, or a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the layer of an IBAD oriented material. Such articles can further include thin films of high temperature superconductive oxides such as YBCO upon the layer of barium-containing material selected from the group consisting of barium zirconate, barium hafnate, barium titanate, barium strontium titanate, barium dysprosium zirconate, barium neodymium zirconate and barium samarium zirconate, or a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates.Type: GrantFiled: July 13, 2006Date of Patent: June 15, 2010Assignee: Los Alamos National Security, LLCInventors: Paul N. Arendt, Stephen R. Foltyn, Liliana Stan, Igor O. Usov, Haiyan Wang
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Patent number: 7736761Abstract: A composite structure including a base substrate and a layer of a mixture of strontium titanate and strontium ruthenate is provided. A superconducting article can include a composite structure including an outermost layer of magnesium oxide, a buffer layer of strontium titanate or a mixture of strontium titanate and strontium ruthenate and a top-layer of a superconducting material such as YBCO upon the buffer layer.Type: GrantFiled: October 31, 2006Date of Patent: June 15, 2010Assignee: Los Alamos National Security, LLCInventors: Stephen R. Foltyn, Quanxi Jia, Paul N. Arendt, Haiyan Wang
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Patent number: 7727934Abstract: Articles are provided including a base substrate having a layer of an oriented cubic oxide material with a rock-salt-like structure layer thereon, and, a layer of epitaxial titanium nitride upon the layer of an oriented cubic oxide material having a rock-salt-like structure. Such articles can further include thin films of high temperature superconductive oxides such as YBCO upon the layer of epitaxial titanium nitride or upon a intermediate buffer layer upon the layer of epitaxial titanium nitride.Type: GrantFiled: December 23, 2004Date of Patent: June 1, 2010Assignee: Los Alamos National Security, LLCInventors: Stephen R. Foltyn, Paul N. Arendt, Haiyan Wang, Liliana Stan
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Publication number: 20100093547Abstract: A composite structure including a base substrate and a layer of a mixture of strontium titanate and strontium ruthenate is provided. A superconducting article can include a composite structure including an outermost layer of magnesium oxide, a buffer layer of strontium titanate or a mixture of strontium titanate and strontium ruthenate and a top-layer of a superconducting material such as YBCO upon the buffer layer.Type: ApplicationFiled: October 31, 2006Publication date: April 15, 2010Inventors: Stephen R. Foltyn, Quanxi Jia, Paul N. Arendt, Haiyan Wang
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Publication number: 20100022397Abstract: The present invention provides articles including a base substrate including a layer of an oriented cubic oxide material having a rock-salt-like structure layer thereon; and, a buffer layer upon the oriented cubic oxide material having a rock-salt-like structure layer, the buffer layer having an outwardly facing surface with a surface morphology including particulate outgrowths of from 10 nm to 500 run in size at the surface, such particulate outgrowths serving as flux pinning centers whereby the article maintains higher performance within magnetic fields than similar articles without the necessary density of such outgrowths.Type: ApplicationFiled: November 30, 2004Publication date: January 28, 2010Inventors: Haiyan Wang, Stephen R. Foltyn, Boris A. Maiorov, Leonardo Civale
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Publication number: 20100009176Abstract: An article including a substrate, a layer of an inert oxide material upon the surface of the substrate, (generally the inert oxide material layer has a smooth surface, i.e., a RMS roughness of less than about 2 nm), a layer of an amorphous oxide or oxynitride material upon the inert oxide material layer, a layer of an oriented cubic oxide material having a rock-salt-like structure upon the amorphous oxide material layer is provided together with additional layers such as at least one layer of a buffer material upon the oriented cubic oxide material layer or a HTS top-layer of YBCO directly upon the oriented cubic oxide material layer. With a HTS top-layer of YBCO upon at least one layer of a buffer material in such an article, Jc's of 1.4×106 A/cm2 have been demonstrated with projected Ic's of 210 Amperes across a sample 1 cm wide.Type: ApplicationFiled: March 29, 2005Publication date: January 14, 2010Inventors: Paul N. Arendt, Stephen R. Foltyn, James R. Groves, Terry G. Holesinger, Quanxi Jia
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Patent number: 7642222Abstract: The present invention provides articles including a base substrate including a layer of an oriented cubic oxide material having a rock-salt-like structure layer thereon; and, a buffer layer upon the oriented cubic oxide material having a rock-salt-like structure layer, the buffer layer having an outwardly facing surface with a surface morphology including particulate outgrowths of from 10 nm to 500 run in size at the surface, such particulate outgrowths serving as flux pinning centers whereby the article maintains higher performance within magnetic fields than similar articles without the necessary density of such outgrowths.Type: GrantFiled: November 30, 2004Date of Patent: January 5, 2010Assignee: Los Alamos National Security, LLCInventors: Haiyan Wang, Stephen R. Foltyn, Boris A. Maiorov, Leonardo Civale
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Patent number: 7593758Abstract: A superconducting tape having reduced AC losses. The tape has a high temperature superconductor layer that is segmented. Disruptive strips, formed in one of the tape substrate, a buffer layer, and the superconducting layer create parallel discontinuities in the superconducting layer that separate the current-carrying elements of the superconducting layer into strips or filament-like structures. Segmentation of the current-carrying elements has the effect of reducing AC current losses. Methods of making such a superconducting tape and reducing AC losses in such tapes are also disclosed.Type: GrantFiled: October 6, 2005Date of Patent: September 22, 2009Assignee: Los Alamos National Security, LLCInventors: Stephen R. Foltyn, Quanxi Jia, Paul N. Arendt, Terry G. Holesinger, Haiyan Wang
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Patent number: 7553799Abstract: A superconducting article includes a substrate having an untextured metal surface; an untextured barrier layer of La2Zr2O7 or Gd2Zr2O7 supported by and in contact with the surface of the substrate; a biaxially textured buffer layer supported by the untextured barrier layer; and a biaxially textured superconducting layer supported by the biaxially textured buffer layer. Moreover, a method of forming a buffer layer on a metal substrate includes the steps of: providing a substrate having an untextured metal surface; coating the surface of the substrate with a barrier layer precursor; converting the precursor to an untextured barrier layer; and depositing a biaxially textured buffer layer above and supported by the untextured barrier layer.Type: GrantFiled: June 2, 2005Date of Patent: June 30, 2009Assignee: UT-Battelle, LLCInventors: Mariappan Parans Paranthaman, Srivatsan Sathyamurthy, Tolga Aytug, Paul N. Arendt, Liliana Stan, Stephen R. Foltyn
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Patent number: 7547661Abstract: An superconductive article and method of forming such an article is disclosed, the article including a substrate and a layer of a rare earth barium cuprate film upon the substrate, the rare earth barium cuprate film including two or more rare earth metals capable of yielding a superconductive composition where ion size variance between the two or more rare earth metals is characterized as greater than zero and less than about 10×10?4, and the rare earth barium cuprate film including two or more rare earth metals is further characterized as having an enhanced critical current density in comparison to a standard YBa2Cu3Oy composition under identical testing conditions.Type: GrantFiled: August 25, 2004Date of Patent: June 16, 2009Assignee: Los Alamos National Security, LLCInventors: Judith L. Driscoll, Stephen R. Foltyn
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Publication number: 20090137401Abstract: A superconducting article includes a substrate having an untextured metal surface; an untextured barrier layer of La2Zr2O7 or Gd2Zr2O7 supported by and in contact with the surface of the substrate; a biaxially textured buffer layer supported by the untextured barrier layer; and a biaxially textured superconducting layer supported by the biaxially textured buffer layer. Moreover, a method of forming a buffer layer on a metal substrate includes the steps of: providing a substrate having an untextured metal surface; coating the surface of the substrate with a barrier layer precursor; converting the precursor to an untextured barrier layer; and depositing a biaxially textured buffer layer above and supported by the untextured barrier layer.Type: ApplicationFiled: January 30, 2009Publication date: May 28, 2009Applicant: UT-BATTELLE, LLCInventors: Mariappan Parans Paranthaman, Srivatsan Sathyamurthy, Tolga Aytug, Paul N. Arendt, Liliana Stan, Stephen R. Foltyn
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Patent number: 7510641Abstract: A continuous process of forming a highly smooth surface on a metallic tape by passing a metallic tape having an initial roughness through an acid bath contained within a polishing section of an electropolishing unit over a pre-selected period of time, and, passing a mean surface current density of at least 0.18 amperes per square centimeter through the metallic tape during the period of time the metallic tape is in the acid bath whereby the roughness of the metallic tape is reduced. Such a highly smooth metallic tape can serve as a base substrate in subsequent formation of a superconductive coated conductor.Type: GrantFiled: July 21, 2003Date of Patent: March 31, 2009Assignee: Los Alamos National Security, LLCInventors: Sascha Kreiskott, Vladimir Matias, Paul N. Arendt, Stephen R. Foltyn, Lawrence E. Bronisz
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Publication number: 20080234134Abstract: A composite structure is provided including a base substrate, an IBAD oriented material upon the base substrate, and a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the IBAD oriented material. Additionally, an article is provided including a base substrate, an IBAD oriented material upon the base substrate, a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the IBAD oriented material, and a thick film upon the cubic metal oxide material. Finally, a superconducting article is provided including a base substrate, an IBAD oriented material upon the base substrate, a cubic metal oxide material selected from the group consisting of rare earth zirconates and rare earth hafnates upon the IBAD oriented material, and an yttrium barium copper oxide material upon the cubic metal oxide material.Type: ApplicationFiled: August 7, 2007Publication date: September 25, 2008Inventors: Liliana Stan, Quanxi Jia, Stephen R. Foltyn
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Patent number: 7258927Abstract: Articles are provided including a base substrate having a layer of an oriented material thereon, and, a layer of hafnium oxide upon the layer of an oriented material. The layer of hafnium oxide can further include a secondary oxide such as cerium oxide, yttrium oxide, lanthanum oxide, scandium oxide, calcium oxide and magnesium oxide. Such articles can further include thin films of high temperature superconductive oxides such as YBCO upon the layer of hafnium oxide or layer of hafnium oxide and secondary oxide.Type: GrantFiled: December 23, 2004Date of Patent: August 21, 2007Assignee: Los Alamos National Security, LLCInventors: Stephen R. Foltyn, Quanxi Jia, Paul N. Arendt
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Patent number: 7129196Abstract: A composite structure including a base substrate and a layer of a mixture of strontium titanate and strontium ruthenate is provided. A superconducting article can include a composite structure including an outermost layer of magnesium oxide, a buffer layer of strontium titanate or a mixture of strontium titanate and strontium ruthenate and a top-layer of a superconducting material such as YBCO upon the buffer layer.Type: GrantFiled: July 21, 2003Date of Patent: October 31, 2006Assignee: Los Alamos National Security, LLCInventors: Stephen R. Foltyn, Quanxi Jia, Paul N. Arendt, Haiyan Wang
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Patent number: 6943136Abstract: A superconductive structure including a dielectric oxide substrate, a thin buffer layer of a superconducting material thereon; and, a layer of a rare earth-barium-copper oxide superconducting film thereon the thin layer of yttrium-barium-copper oxide, the rare earth selected from the group consisting of samarium, gadolinium, ytterbium, erbium, neodymium, dysprosium, holmium, lutetium, a combination of more than one element from the rare earth group and a combination of one or more elements from the rare earth group with yttrium, the buffer layer of superconducting material characterized as having chemical and structural compatibility with the dielectric oxide substrate and the rare earth-barium-copper oxide superconducting film is provided.Type: GrantFiled: December 17, 2002Date of Patent: September 13, 2005Assignee: The Regents of the University of CaliforniaInventors: Chuhee Kwon, Quanxi Jia, Stephen R. Foltyn
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Patent number: 6933065Abstract: An article including a substrate, a layer of an inert oxide material upon the surface of the substrate, (generally the inert oxide material layer has a smooth surface, i.e., a RMS roughness of less than about 2 nm), a layer of an amorphous oxide or oxynitride material upon the inert oxide material layer, a layer of an oriented cubic oxide material having a rock-salt-like structure upon the amorphous oxide material layer is provided together with additional layers such as at least one layer of a buffer material upon the oriented cubic oxide material layer or a HTS top-layer of YBCO directly upon the oriented cubic oxide material layer. With a HTS top-layer of YBCO upon at least one layer of a buffer material in such an article, Jc's of 1.4×106 A/cm2 have been demonstrated with projected Ic's of 210 Amperes across a sample 1 cm wide.Type: GrantFiled: September 25, 2003Date of Patent: August 23, 2005Assignee: The Regents of the University of CaliforniaInventors: Paul N. Arendt, Stephen R. Foltyn, James R. Groves, Terry G. Holesinger, Quanxi Jia