Patents by Inventor Walter Alvarez
Walter Alvarez 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: 7585482Abstract: A method of purifying a single-walled carbon nanotube catalytic product having the steps of providing a catalytic product including single-walled carbon nanotubes, and a Group VIII and/or Group VIb transition metal, exposing the catalytic product to a heated oxidative gas to provide a treated carbon nanotube product including single-walled carbon nanotubes and the Group VIII and/or Group VIb transition metal, and exposing the treated carbon nanotube product to an acid to separate the single-walled carbon nanotubes from the Group VIII and/or Group VIb transition metal. The catalytic product may include a support material and amorphous carbon.Type: GrantFiled: October 17, 2005Date of Patent: September 8, 2009Assignee: The Board of Regents of the University of OklahomaInventors: Daniel E. Resasco, Boonyarach Kitiyanan, Walter Alvarez, Leandro Balzano
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Patent number: 7563428Abstract: A method of producing a carbon nanotube product comprising a catalytic particle and single-walled carbon nanotubes deposited thereon. The catalytic particles preferably contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The catalytic particle preferably further comprises a support material such as silica. The carbon nanotube product is preferably formed by exposing the catalytic particle to a carbon-containing gas at a temperature sufficient to form the single-walled nanotubes as a primary portion of a solid carbon product on the catalytic particles.Type: GrantFiled: January 24, 2006Date of Patent: July 21, 2009Assignee: The Board of Regents of the University of OklahomaInventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Publication number: 20080107588Abstract: A method of producing a carbon nanotube product comprising a catalytic particle and carbon nanotubes deposited thereon. The catalytic particles preferably contain Co or Ni metal from Group VIII, and Mo or W metal from Group VIb. The catalytic particle preferably comprises a support material upon which the metals are disposed. The carbon nanotube product is preferably formed by exposing the catalytic particle to a carbon-containing gas at a temperature sufficient to form the carbon nanotubes as a primary portion of a solid carbon product with minor amounts of graphite and amorphous carbon residue.Type: ApplicationFiled: May 25, 2007Publication date: May 8, 2008Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Publication number: 20080008644Abstract: A method of purifying a single-walled carbon nanotube catalytic product having the steps of providing a catalytic product including single-walled carbon nanotubes, and a Group VIII and/or Group VIb transition metal, exposing the catalytic product to a heated oxidative gas to provide a treated carbon nanotube product including single-walled carbon nanotubes and the Group VIII and/or Group VIb transition metal, and exposing the treated carbon nanotube product to an acid to separate the single-walled carbon nanotubes from the Group VIII and/or Group VIb transition metal. The catalytic product may include a support material and amorphous carbon.Type: ApplicationFiled: October 17, 2005Publication date: January 10, 2008Inventors: Daniel Resasco, Boonyarach Kitiyanan, Walter Alvarez, Leandro Balzano
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Publication number: 20070116630Abstract: A method of producing a carbon nanotube product comprising a catalytic particle and single-walled carbon nanotubes deposited thereon. The catalytic particles preferably contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The catalytic particle preferably further comprises a support material such as silica. The carbon nanotube product is preferably formed by exposing the catalytic particle to a carbon-containing gas at a temperature sufficient to form the single-walled nanotubes as a primary portion of a solid carbon product on the catalytic particles.Type: ApplicationFiled: January 24, 2006Publication date: May 24, 2007Inventors: Daniel Resasco, Boonyarach Kitiyanan, Jeffrey Harwell, Walter Alvarez
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Patent number: 7094386Abstract: A method of producing a carbon nanotube product comprising a catalytic particle and single-walled carbon nanotubes deposited thereon. The catalytic particles preferably contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The catalytic particle preferably further comprises a support material such as silica. The carbon nanotube product is preferably formed by exposing the catalytic particle to a carbon-containing gas at a temperature sufficient to form the single-walled nanotubes as a primary portion of a solid carbon product on the catalytic particles.Type: GrantFiled: August 25, 2004Date of Patent: August 22, 2006Assignee: The Board of Regents of the University of OklahomaInventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Publication number: 20060039849Abstract: A process and apparatus for catalytic production of single walled carbon nanotubes. Catalytic particles are exposed to different process conditions at successive stages wherein the catalytic particles do not come in contact with reactive (catalytic) gases until preferred process conditions have been attained, thereby controlling the quantity and form of carbon nanotubes produced. The reaction gas is preferably provided at a high space velocity to minimize CO2 build-up. The process also contemplates processes and apparatus which recycle and reuse the gases and catalytic particulate materials, thereby maximizing cost efficiency, reducing wastes, reducing the need for additional raw materials, and producing the carbon nanotubes, especially SWNTs, in greater quantities and for lower costs.Type: ApplicationFiled: October 28, 2004Publication date: February 23, 2006Inventors: Daniel Resasco, Boonyarach Kitiyanan, Walter Alvarez, Leandro Balzano
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Patent number: 6994907Abstract: A carbon nanotube product formed from a metallic catalytic particle and single-walled carbon nanotubes deposited thereon. The catalytic particles preferably contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The metallic catalytic particle preferably further comprises a support material such as silica. The carbon nanotube product is preferably formed by exposing the metallic catalytic particle to a carbon-containing gas at a temperature sufficient to form the single-walled nanotubes as a primary portion of a solid carbon product on the metallic catalytic particles.Type: GrantFiled: April 25, 2003Date of Patent: February 7, 2006Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Patent number: 6962892Abstract: A metallic catalytic particle for producing single-walled carbon nanotubes. The catalytic particles contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The metal component is on a support such as silica.Type: GrantFiled: January 8, 2004Date of Patent: November 8, 2005Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Patent number: 6955800Abstract: A method and apparatus for catalytic production of carbon nanotubes. Catalytic particles are exposed to different process conditions at successive stages wherein the catalytic particles do not come in contact with reactive (catalytic) gases until preferred process conditions have been attained, thereby controlling the quantity and form of carbon nanotubes produced. The method also contemplates methods and apparatus which recycle and reuse the gases and catalytic particulate materials, thereby maximizing cost efficiency, reducing wastes, reducing the need for additional raw materials, and producing the carbon nanotubes, especially SWNTs, in greater quantities and for lower costs.Type: GrantFiled: May 13, 2002Date of Patent: October 18, 2005Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Walter Alvarez, Leandro Balzano
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Publication number: 20050042162Abstract: A process and apparatus for catalytic production of single walled carbon nanotubes. Catalytic particles are exposed to different process conditions at successive stages wherein the catalytic particles do not come in contact with reactive (catalytic) gases until preferred process conditions have been attained, thereby controlling the quantity and form of carbon nanotubes produced. The process also contemplates processes and apparatus which recycle and reuse-the gases and catalytic particulate materials, thereby maximizing cost efficiency, reducing wastes, reducing the need for additional raw materials, and producing the carbon nanotubes, especially SWNTs, in greater quantities and for lower costs.Type: ApplicationFiled: November 28, 2001Publication date: February 24, 2005Inventors: Daniel Resasco, Boonyarach Kitiyanan, Walter Alvarez, Leandro Balzano
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Publication number: 20050025696Abstract: A method of producing a carbon nanotube product comprising a catalytic particle and single-walled carbon nanotubes deposited thereon. The catalytic particles preferably contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The catalytic particle preferably further comprises a support material such as silica. The carbon nanotube product is preferably formed by exposing the catalytic particle to a carbon-containing gas at a temperature sufficient to form the single-walled nanotubes as a primary portion of a solid carbon product on the catalytic particles.Type: ApplicationFiled: August 25, 2004Publication date: February 3, 2005Inventors: Daniel Resasco, Boonyarach Kitiyanan, Jeffrey Harwell, Walter Alvarez
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Publication number: 20040186011Abstract: A metallic catalytic particle for producing single-walled carbon nanotubes. The catalytic particles contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The metal component is on a support such as silica.Type: ApplicationFiled: January 8, 2004Publication date: September 23, 2004Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Publication number: 20040070009Abstract: A carbon nanotube product formed from a metallic catalytic particle and single-walled carbon nanotubes deposited thereon. The catalytic particles preferably contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The metallic catalytic particle preferably further comprises a support material such as silica. The carbon nanotube product is preferably formed by exposing the metallic catalytic particle to a carbon-containing gas at a temperature sufficient to form the single-walled nanotubes as a primary portion of a solid carbon product on the metallic catalytic particles.Type: ApplicationFiled: April 25, 2003Publication date: April 15, 2004Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez
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Publication number: 20020165091Abstract: A metallic catalytic particle for producing single-walled carbon nanotubes. The catalytic particles contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The metal component is on a support such as silica.Type: ApplicationFiled: November 19, 2001Publication date: November 7, 2002Inventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez, Dukhwan Jang
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Publication number: 20020131910Abstract: A method and apparatus for catalytic production of carbon nanotubes. Catalytic particles are exposed to different process conditions at successive stages wherein the catalytic particles do not come in contact with reactive (catalytic) gases until preferred process conditions have been attained, thereby controlling the quantity and form of carbon nanotubes produced. The method also contemplates methods and apparatus which recycle and reuse the gases and catalytic particulate materials, thereby maximizing cost efficiency, reducing wastes, reducing the need for additional raw materials, and producing the carbon nanotubes, especially SWNTs, in greater quantities and for lower costs.Type: ApplicationFiled: May 13, 2002Publication date: September 19, 2002Inventors: Daniel E. Resasco, Boonvarach Kitivanan, Walter Alvarez, Leandro Balzano
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Patent number: 6413487Abstract: A method and apparatus for catalytic production of carbon nanotubes. Catalytic particles are exposed to different process conditions at successive stages wherein the catalytic particles do not come in contact with reactive (catalytic) gases until preferred process conditions have been attained, thereby controlling the quantity and form of carbon nanotubes produced. The method also contemplates methods and apparatus which recycle and reuse the gases and catalytic particulate materials, thereby maximizing cost efficiency, reducing wastes, reducing the need for additional raw materials, and producing the carbon nanotubes, especially SWNTs, in greater quantities and for lower costs.Type: GrantFiled: June 2, 2000Date of Patent: July 2, 2002Assignee: The Board of Regents of the University of OklahomaInventors: Daniel E. Resasco, Boonyarach Kitiyanan, Walter Alvarez, Leandro Balzano
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Patent number: 6333016Abstract: A method for producing carbon nanotubes by contacting a carbon containing gas with metallic catalytic particles. The catalytic particles contain at least one metal from Group VIII, including for example Co, Ni, Ru, Rh, Pd, Ir, and Pt, and at least one metal from Group VIb including for example Mo, W and Cr. The metal component may be deposited on a support. Preferably, a substantial percentage of the nanotubes formed are single-walled carbon nanotubes. Further, a method for determining catalyst composition and reaction conditions for optimizing production of single-walled carbon nanotubes is also disclosed.Type: GrantFiled: September 3, 1999Date of Patent: December 25, 2001Assignee: The Board of Regents of the University of OklahomaInventors: Daniel E. Resasco, Boonyarach Kitiyanan, Jeffrey H. Harwell, Walter Alvarez