Patents by Inventor Andre Hamwi
Andre Hamwi 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: 9705133Abstract: The invention relates to the use of subfluorinated carbon nano-objects as an electrode material of primary lithium batteries, the electrode obtained by that use and a lithium battery comprising such an electrode. The subfluorinated carbon nano-objects used in the invention have a central part made of nonfluorinated carbon and a peripheral part made of fluorinated carbon of formula CFX where x represents the F/C atomic ratio, which is such that 0.25<x<1.1 and whereof the spectrum 19F MAS RMN has a single peak between ?150 and ?190 ppm/CFCl3 (outside of rotation bands). The invention applies to the field of storing and retrieving energy, in particular.Type: GrantFiled: December 11, 2013Date of Patent: July 11, 2017Assignee: UNIVERSITE BLAISE PASCAL-CLERMONT-FERRAND IIInventors: Katia Guerin Araujo Da Silva, Marc Denis Alphonse Dubois, Andre Hamwi
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Publication number: 20160072130Abstract: The invention relates to the use of subfluorinated carbon nano-objects as an electrode material of primary lithium batteries, the electrode obtained by that use and a lithium battery comprising such an electrode. The subfluorinated carbon nano-objects used in the invention have a central part made of nonfluorinated carbon and a peripheral part made of fluorinated carbon of formula CFx where x represents the F/C atomic ratio, which is such that 0.25<x<1.1 and whereof the spectrum 19F MAS RMN has a single peak between ?150 and ?190 ppm/CFCl3 (outside of rotation bands). The invention applies to the field of storing and retrieving energy, in particular.Type: ApplicationFiled: December 11, 2013Publication date: March 10, 2016Inventors: Katia GUERIN ARAUJO DA SILVA, Marc Denis Alphonse DUBOIS, Andre HAMWI
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Patent number: 8507288Abstract: The invention relates to the use of carbon nanomaterials as a filtration material pervious to nitrogen dioxide and impervious to ozone. The invention also relates to the use of carbon nanomaterials having a specific surface, measured by the BET method, of 15 to 40 m2/g inclusive and a form factor, equal to the ratio (highest dimension/lowest dimension) of the nanomaterial, of 5 to 250 inclusive, as material for filtering a gas mixture containing nitrogen dioxide and ozone, being pervious to the nitrogen dioxide and impervious to the ozone. The invention can be used in the field of air pollution.Type: GrantFiled: May 27, 2009Date of Patent: August 13, 2013Assignees: Centre National de la Recherche Scientifique, Universite Blaise Pascal—Clermont—Ferrand IIInventors: Alain Pauly, Marc Dubois, Katia Guerin, André Hamwi, Jérôme Brunet, Christelle Varenne, Bernard Lauron
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Patent number: 8232007Abstract: Subfluorinated carbonaceous materials obtained through direct fluorination of graphite or coke particles are provided. One set of subfluorinated carbonaceous materials has an average chemical composition CFx in which 0.63<x?0.95, 0.66<x?0.95 or 0.7<x?0.95. The subfluorinated carbonaceous materials are capable of electrochemical performance superior to commercial CF at relatively high rates of discharge.Type: GrantFiled: February 21, 2007Date of Patent: July 31, 2012Assignees: California Institute of Technology, Centre National de la Recherche Scientifique (C.N.R.S.), Universite Blaise PascalInventors: Rachid Yazami, André Hamwi
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Publication number: 20110124112Abstract: The invention relates to the use of carbon nanomaterials as a filtration material pervious to nitrogen dioxide and impervious to ozone. The invention also relates to the use of carbon nanomaterials having a specific surface, measured by the BET method, of 15 to 40 m2/g inclusive and a form factor, equal to the ratio (highest dimension/lowest dimension) of the nanomaterial, of 5 to 250 inclusive, as material for filtering a gas mixture containing nitrogen dioxide and ozone, being pervious to the nitrogen dioxide and impervious to the ozone. The invention can be used in the field of air pollution.Type: ApplicationFiled: May 27, 2009Publication date: May 26, 2011Inventors: Alain Pauly, Marc Dubois, Katia Guerin, André Hamwi, Jérôme Brunet, Christelle Varenne, Bernard Lauron
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Publication number: 20110098517Abstract: The invention relates to the use of subfluorinated carbons as a solid lubricant. Said subfluorinated carbons simultaneously contain fluorinated carbon domains with a (CF)n structure and non-fluorinated graphitic carbon domains, in powder form, as a solid lubricant. The invention can be used in the field of solid lubricants.Type: ApplicationFiled: May 27, 2009Publication date: April 28, 2011Inventors: André Hamwi, Marc Dubois, Katia Guerin, Rachid Yazami
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Publication number: 20110003149Abstract: The invention provides fluorinated multi-layered carbon nanomaterials and methods for their production. In one aspect of the invention, the carbon nanomaterials are partially fluorinated and retain some unreacted carbon. The invention also provides electrodes and electrochemical devices incorporating the fluorinated carbon nanomaterials of the invention.Type: ApplicationFiled: September 13, 2010Publication date: January 6, 2011Inventors: Rachid YAZAMI, André Hamwi
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Patent number: 7794880Abstract: The invention provides fluorinated multi-layered carbon nanomaterials and methods for their production. In one aspect of the invention, the carbon nanomaterials are partially fluorinated and retain some unreacted carbon. The invention also provides electrodes and electrochemical devices incorporating the fluorinated carbon nanomaterials of the invention. In one aspect of the invention, the electrochemical has a first electrode including the at least partially fluorinated carbon materials of the invention and a second electrode including a source of lithium ions.Type: GrantFiled: November 16, 2006Date of Patent: September 14, 2010Assignees: California Institute of Technology, Centre National de la Recherche Scientifique (C.N.R.S), Universite Blaise PascalInventors: Rachid Yazami, André Hamwi
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Publication number: 20090258294Abstract: Subfluorinated graphite fluorides of formula CFx wherein x is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.Type: ApplicationFiled: June 23, 2009Publication date: October 15, 2009Applicants: CALIFORNIA INSTITUTE OF TECHNOLOGY, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUEInventors: Rachid YAZAMI, Andre HAMWI
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Patent number: 7563542Abstract: Subfluorinated graphite fluorides of formula CFx wherein CFx is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.Type: GrantFiled: June 6, 2006Date of Patent: July 21, 2009Assignees: California Institute of Technology, Centre National de la Recherche ScientifiqueInventors: Rachid Yazami, André Hamwi
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Publication number: 20070231696Abstract: The invention provides fluorinated multi-layered carbon nanomaterials and methods for their production. In one aspect of the invention, the carbon nanomaterials are partially fluorinated and retain some unreacted carbon. The invention also provides electrodes and electrochemical devices incorporating the fluorinated carbon nanomaterials of the invention.Type: ApplicationFiled: November 16, 2006Publication date: October 4, 2007Inventors: RACHID YAZAMI, ANDRE HAMWI
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Publication number: 20070231697Abstract: Subfluorinated carbonaceous materials obtained through direct fluorination of graphite or coke particles are provided. One set of subfluorinated carbonaceous materials has an average chemical composition CFx in which 0.63<x?0.95, 0.66<x?0.95 or 0.7<x?0.95. The subfluorinated carbonaceous materials are capable of electrochemical performance superior to commercial CF at relatively high rates of discharge.Type: ApplicationFiled: February 21, 2007Publication date: October 4, 2007Inventors: Rachid Yazami, Andre Hamwi
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Publication number: 20070218364Abstract: The present invention provides electrochemical cells providing good electronic performance at low temperatures. Electrochemical cells of the present invention include lithium batteries capable of providing useful specific capacities under significant discharge rates for temperatures as low as ?60 degrees Celsius. The present invention also provides methods for making electrochemical cells including a room temperature predischarge step preceding low temperature operation that enhances the performance of batteries having subfluorinated carbonaceous positive electrode active materials at low temperatures.Type: ApplicationFiled: February 15, 2007Publication date: September 20, 2007Inventors: Jay Whitacre, Rachid Yazami, Ratnakumar Bugga, Surya Prakash, Marshall Smart, William West, Andre Hamwi
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Publication number: 20070077493Abstract: Subfluorinated graphite fluorides of formula CFx, wherein x is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.Type: ApplicationFiled: October 18, 2005Publication date: April 5, 2007Applicant: California Institute of TechnologyInventors: Rachid Yazami, Andre Hamwi
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Publication number: 20070077495Abstract: Subfluorinated graphite fluorides of formula CFx wherein x is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.Type: ApplicationFiled: June 6, 2006Publication date: April 5, 2007Applicants: CALIFORNIA INSTITUTE OF TECHNOLOGY, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUEInventors: Rachid Yazami, Andre Hamwi
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Patent number: 6358649Abstract: The invention relates to new carbons containing fluorine. The carbons containing fluorine are obtained from a graphite or a mosaic textured graphitisable compound containing carbon. As a first step, the graphite or the carbon-containing compound is reacted with a gaseous mixture (HF+F2) in presence of an MFn fluoride at a temperature range between 15° C. and 80° C., M representing an element selected among I, Cl, Br, Re, W, Mo, Nb, Ta, B, Ti, P, As, Sb, S, Se, Te, Pt, Ir, and Os and n representing the valency of the element M, with n≧7. As a second step, the compound obtained at the end of the first step is reacted with fluorine for 1 to 20 hours at a temperature range between 20° C. and 400° C. The invention is useful as an active electrode material.Type: GrantFiled: January 22, 1999Date of Patent: March 19, 2002Assignee: Centre National de la Recherche ScientifiqueInventors: Rachid Yazami, André Hamwi, Pascal Hany
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Patent number: 5175066Abstract: The present invention relates to a rechargeable battery with solid electrolyte.The battery according to the invention comprises a solid polymer electrolyte, an anode composed of a lithium source and a cathode comprising a lithium-receiving material. The lithium-receiving material is a compound of the formula CF.sub.x M.sub.y, where M is chosen from I, Cl, Br, Re, W, Mo, B and 0.3.ltoreq.x.ltoreq.0.9, 0.02.ltoreq.y.ltoreq.0.06, and the structure of this material is such that the carbon atoms form planar hexagons.The battery according to the invention has improved capacity.Type: GrantFiled: June 25, 1991Date of Patent: December 29, 1992Assignee: Centre National de la Recherche Scientifique (CNRS)Inventors: Andre Hamwi, Rachid Yazami