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).

  • Patent number: 9705133
    Abstract: 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: Grant
    Filed: December 11, 2013
    Date of Patent: July 11, 2017
    Assignee: UNIVERSITE BLAISE PASCAL-CLERMONT-FERRAND II
    Inventors: Katia Guerin Araujo Da Silva, Marc Denis Alphonse Dubois, Andre Hamwi
  • Publication number: 20160072130
    Abstract: 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: Application
    Filed: December 11, 2013
    Publication date: March 10, 2016
    Inventors: Katia GUERIN ARAUJO DA SILVA, Marc Denis Alphonse DUBOIS, Andre HAMWI
  • Patent number: 8507288
    Abstract: 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: Grant
    Filed: May 27, 2009
    Date of Patent: August 13, 2013
    Assignees: Centre National de la Recherche Scientifique, Universite Blaise Pascal—Clermont—Ferrand II
    Inventors: Alain Pauly, Marc Dubois, Katia Guerin, André Hamwi, Jérôme Brunet, Christelle Varenne, Bernard Lauron
  • Patent number: 8232007
    Abstract: 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: Grant
    Filed: February 21, 2007
    Date of Patent: July 31, 2012
    Assignees: California Institute of Technology, Centre National de la Recherche Scientifique (C.N.R.S.), Universite Blaise Pascal
    Inventors: Rachid Yazami, André Hamwi
  • Publication number: 20110124112
    Abstract: 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: Application
    Filed: May 27, 2009
    Publication date: May 26, 2011
    Inventors: Alain Pauly, Marc Dubois, Katia Guerin, André Hamwi, Jérôme Brunet, Christelle Varenne, Bernard Lauron
  • Publication number: 20110098517
    Abstract: 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: Application
    Filed: May 27, 2009
    Publication date: April 28, 2011
    Inventors: André Hamwi, Marc Dubois, Katia Guerin, Rachid Yazami
  • Publication number: 20110003149
    Abstract: 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: Application
    Filed: September 13, 2010
    Publication date: January 6, 2011
    Inventors: Rachid YAZAMI, André Hamwi
  • Patent number: 7794880
    Abstract: 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: Grant
    Filed: November 16, 2006
    Date of Patent: September 14, 2010
    Assignees: California Institute of Technology, Centre National de la Recherche Scientifique (C.N.R.S), Universite Blaise Pascal
    Inventors: Rachid Yazami, André Hamwi
  • Publication number: 20090258294
    Abstract: 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: Application
    Filed: June 23, 2009
    Publication date: October 15, 2009
    Applicants: CALIFORNIA INSTITUTE OF TECHNOLOGY, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Rachid YAZAMI, Andre HAMWI
  • Patent number: 7563542
    Abstract: 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: Grant
    Filed: June 6, 2006
    Date of Patent: July 21, 2009
    Assignees: California Institute of Technology, Centre National de la Recherche Scientifique
    Inventors: Rachid Yazami, André Hamwi
  • Publication number: 20070231696
    Abstract: 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: Application
    Filed: November 16, 2006
    Publication date: October 4, 2007
    Inventors: RACHID YAZAMI, ANDRE HAMWI
  • Publication number: 20070231697
    Abstract: 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: Application
    Filed: February 21, 2007
    Publication date: October 4, 2007
    Inventors: Rachid Yazami, Andre Hamwi
  • Publication number: 20070218364
    Abstract: 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: Application
    Filed: February 15, 2007
    Publication date: September 20, 2007
    Inventors: Jay Whitacre, Rachid Yazami, Ratnakumar Bugga, Surya Prakash, Marshall Smart, William West, Andre Hamwi
  • Publication number: 20070077493
    Abstract: 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: Application
    Filed: October 18, 2005
    Publication date: April 5, 2007
    Applicant: California Institute of Technology
    Inventors: Rachid Yazami, Andre Hamwi
  • Publication number: 20070077495
    Abstract: 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: Application
    Filed: June 6, 2006
    Publication date: April 5, 2007
    Applicants: CALIFORNIA INSTITUTE OF TECHNOLOGY, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Rachid Yazami, Andre Hamwi
  • Patent number: 6358649
    Abstract: 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: Grant
    Filed: January 22, 1999
    Date of Patent: March 19, 2002
    Assignee: Centre National de la Recherche Scientifique
    Inventors: Rachid Yazami, André Hamwi, Pascal Hany
  • Patent number: 5175066
    Abstract: 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: Grant
    Filed: June 25, 1991
    Date of Patent: December 29, 1992
    Assignee: Centre National de la Recherche Scientifique (CNRS)
    Inventors: Andre Hamwi, Rachid Yazami