Patents by Inventor Howard G. Tennent
Howard G. Tennent 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: 7960904Abstract: The present invention relates to a field emission device comprising an anode and a cathode, wherein said cathode includes carbon nanotubes nanotubes which have been subjected to energy, plasma, chemical, or mechanical treatment. The present invention also relates to a field emission cathode comprising carbon nanotubes which have been subject to such treatment. A method for treating the carbon nanotubes and for creating a field emission cathode is also disclosed. A field emission display device containing carbon nanotube which have been subject to such treatment is further disclosed.Type: GrantFiled: March 30, 2007Date of Patent: June 14, 2011Assignee: Hyperion Catalysis International, Inc.Inventors: Mikio Takai, Alan B. Fischer, Chunming Niu, Howard G. Tennent, Robert Hoch, Hans Biebuyck
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Publication number: 20080203886Abstract: The present invention relates to a field emission device comprising an anode and a cathode, wherein said cathode includes carbon nanotubes nanotubes which have been subjected to energy, plasma, chemical, or mechanical treatment. The present invention also relates to a field emission cathode comprising carbon nanotubes which have been subject to such treatment. A method for treating the carbon nanotubes and for creating a field emission cathode is also disclosed. A field emission display device containing carbon nanotube which have been subject to such treatment is further disclosed.Type: ApplicationFiled: August 20, 2007Publication date: August 28, 2008Applicant: Hyperion Catalysis International, Inc.Inventors: Mikio Takai, Alan B. Fischer, Chunming Niu, Howard G. Tennent, Robert Hoch, Hans Biebuyck
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Publication number: 20030090190Abstract: The present invention relates to a field emission device comprising an anode and a cathode, wherein said cathode includes carbon nanotubes nanotubes which have been subjected to energy, plasma, chemical, or mechanical treatment. The present invention also relates to a field emission cathode comprising carbon nanotubes which have been subject to such treatment. A method for treating the carbon nanotubes and for creating a field emission cathode is also disclosed. A field emission display device containing carbon nanotube which have been subject to such treatment is further disclosed.Type: ApplicationFiled: June 14, 2002Publication date: May 15, 2003Applicant: Hyperion Catalysis International, Inc.Inventors: Mikio Takai, Alan B. Fischer, Chunming Niu, Howard G. Tennent, Robert Hoch, Hans Biebuyck
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Patent number: 6248478Abstract: An improved battery having an anode, a cathode that includes a chemically reducible material into which is incorporated an amount of electrically conductive carbon microfibers sufficient to enhance the electrical conductivity of said chemically reducible material, and an electrolyte.Type: GrantFiled: May 31, 1995Date of Patent: June 19, 2001Assignee: Hyperion Catalysis International, Inc.Inventors: Stephen O. Friend, Jaspard Harvey Atkins, Howard G. Tennent, Robert Hausslein
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Patent number: 6235674Abstract: This invention concerns composite materials comprising a plurality of carbon fibrils in a matrix wherein the carbon fibrils are each characterized by a substantially constant diameter between about 3.5 to 70 nanometers and are substantially free of pyrolytically deposited thermal carbon.Type: GrantFiled: June 5, 1995Date of Patent: May 22, 2001Assignee: Hyperion Catalysis InternationalInventors: Howard G. Tennent, James J. Barber, Robert Hoch
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Patent number: 6113819Abstract: The invention relates to an interpenetrating network of carbon fibrils and a polymer, which comprises a rigidized, three-dimensional macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils and an innerpenetrating mass of an organic polymer. The invention also relates to methods of making and using such innerpenetrating networks.Type: GrantFiled: August 5, 1999Date of Patent: September 5, 2000Assignee: Hyperion Catalysis International, Inc.Inventors: Howard G. Tennent, Chun Ming Niu, Robert Hoch, Alan B. Fischer
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Patent number: 5968650Abstract: The invention relates to an interpenetrating network of carbon fibrils and a polymer, which comprises a rigidized, three-dimensional macroscopic assemblage of a multiplicity of randomly oriented carbon fibrils and an innerpenetrating mass of an organic polymer. The invention also relates to methods of making and using such innerpenetrating networks.Type: GrantFiled: November 3, 1997Date of Patent: October 19, 1999Assignee: Hyperion Catalysis International, Inc.Inventors: Howard G. Tennent, Chun Ming Niu, Robert Hoch, Alan B. Fischer
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Patent number: 5877110Abstract: Products containing carbon fibrils having a morphology of vermicular tubes that are free of a continuous thermal carbon overcoat and have graphitic layers, wherein the length of the projection of the graphitic layers on the fibril axis extends along the axis for a distance of at least two fibril diameters. The fibrils are used to form composites, adsorbents and mats.Type: GrantFiled: May 23, 1995Date of Patent: March 2, 1999Assignee: Hyperion Catalysis International, Inc.Inventors: Carl Snyder, W. Harry Mandeville, Howard G. Tennent, Larry K. Truesdale, James J. Barber
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Patent number: 5707916Abstract: A volume of carbon fibrils that includes a multiplicity of fibrils having a morphology consisting of vermicular tubes that are free of a continuous thermal carbon overcoat and have graphite layers that are substantially parallel to the fibril axis and a process for preparing such fibrils.Type: GrantFiled: May 1, 1991Date of Patent: January 13, 1998Assignee: Hyperion Catalysis International, Inc.Inventors: Carl Snyder, W. Harry Mandeville, Howard G. Tennent, Larry K. Truesdale, James J. Barber
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Patent number: 5650370Abstract: This invention relates to a method of supporting a catalyst which involves attaching a catalyst to either a furry fiber, a furry plate or a discrete carbon fibril. The furry fiber or furry plate include a carbon fiber or plate and a plurality of carbon fibrils adhering to the outer surface of the carbon fiber or plate.Type: GrantFiled: June 5, 1995Date of Patent: July 22, 1997Assignee: Hyperion Catalysis International, Inc.Inventors: Howard G. Tennent, James J. Barber, Robert Hoch
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Patent number: 5589152Abstract: This invention concerns a discrete carbon fibril characterized by a substantially constant diameter between about 3.5 and about 70 nanometers, length greater than about 5 times the diameter and less than about 100 times the diameter, an outer region of multiple essentially continuous layers of ordered carbon atoms and a distinct inner core region. The invention further concerns a plurality of such fibrils.The fibrils of this invention may be produced by contacting for an appropriate period of time and at a suitable pressure a suitable metal-containing particle with a suitable gaseous, carbon-containing compound, at a temperature between about 850.degree. C. and 1200.degree. C., or by treating discrete carbon fibrils, characterized by a length greater than about 100 times the diameter. Carbon fibrils may also be continuously produced by continuously contacting for an appropriate period of time at suitable conditions.Type: GrantFiled: June 6, 1995Date of Patent: December 31, 1996Assignee: Hyperion Catalysis International, Inc.Inventors: Howard G. Tennent, James J. Barber, Robert Hoch
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Patent number: 5578543Abstract: This invention concerns composite materials comprising a plurality of carbon fibrils in a matrix wherein the carbon fibrils are each characterized by a substantially constant diameter between about 3.5 to 70 nanometers and are substantially free of pyrolytically deposited thermal carbon.Type: GrantFiled: June 5, 1995Date of Patent: November 26, 1996Assignee: Hyperion Catalysis Int'l, Inc.Inventors: Howard G. Tennent, James J. Barber, Robert Hoch
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Patent number: 5171560Abstract: A process for preparing carbon fibrils using discrete, unfused, metal-containing catalytic particles encapsulated in non-graphitic carbon, a carbide, or an organic polymer.Type: GrantFiled: March 9, 1990Date of Patent: December 15, 1992Assignee: Hyperion Catalysis InternationalInventor: Howard G. Tennent
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Patent number: 5165909Abstract: The invention relates to carbon fibrils characterized by a substantially constant diameter, length greater than about 5 times the diameter, an ordered outer region of catalytically grown, multiple, substantially continuous layers of ordered carbon atoms having an outside diameter between about 3.5 and 70 nanometers, and a distinct inner core region. Each of the layers and the core are disposed substantially concentrically about the cylindrical axis of the fibril. The fibrils are substantially free of pyrolytically deposited thermal carbon with the diameter of the fibrils being equal to the outside diameter of the ordered outer region.Type: GrantFiled: October 1, 1990Date of Patent: November 24, 1992Assignee: Hyperion Catalysis Int'l., Inc.Inventors: Howard G. Tennent, James J. Barber, Robert Hoch
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Patent number: 5110693Abstract: An improved electrochemical cell that includes a catalytic electrode on which an electrochemical reaction occurs into which is incorporated an amount of electrically conductive carbon microfibers having diameters less than or equal to 0.1 micron sufficient to enhance the electrical conductivity of the electrode.Type: GrantFiled: October 23, 1990Date of Patent: May 5, 1992Assignee: Hyperion Catalysis InternationalInventors: Stephen O. Friend, Jaspard H. Atkins, Howard G. Tennent, Robert Hausslein
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Patent number: 4663230Abstract: This invention concerns an essentially cylindrical discrete carbon fibril characterized by a substantially constant diameter between about 3.5 and about 70 nanometers, e.g. between about 7 and 25 nanometers, length greater than about 10.sup.2 times the diameter, an outer region of multiple essentially continuous layers of ordered carbon atoms and a distinct inner core region, each of the layers and core disposed substantially concentrically about the cylindrical axis of the fibril. Preferably the entire fibril is substantially free of thermal carbon overcoat. The invention further concerns a plurality of such fibrils.The fibril or plurality of fibrils of this invention may be produced by contacting for an appropriate period of time and at suitable pressure a suitable metal-containing particle with a suitable gaseous, carbon-containing compound, at a temperature between about 850.degree. C. and 1200.degree. C.Type: GrantFiled: December 6, 1984Date of Patent: May 5, 1987Assignee: Hyperion Catalysis International, Inc.Inventor: Howard G. Tennent