Patents by Inventor Christine Lefrou
Christine Lefrou 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: 9933471Abstract: A device for measuring an electric field in a conducting medium comprises: two electrodes separated by a volume of an insulating medium; a device for measuring current coupled to said electrodes; and adjustment elements making it possible to vary a quantity on which the electrical conductivity of the field measuring device depends.Type: GrantFiled: November 4, 2014Date of Patent: April 3, 2018Assignee: COMMISSARIAT À L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Mathieu Baicry, Matthieu Le Prado, Christine Lefrou, Laure-Line Rouve
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Publication number: 20160274158Abstract: A device for measuring an electric field in a conducting medium comprises: two electrodes separated by a volume of an insulating medium; a device for measuring current coupled to said electrodes; and adjustment elements making it possible to vary a quantity on which the electrical conductivity of the field measuring device depends.Type: ApplicationFiled: November 4, 2014Publication date: September 22, 2016Inventors: Mathieu BAICRY, Matthieu LE PRADO, Christine LEFROU, Laure-Line ROUVE
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Patent number: 8823326Abstract: The method for determining the state of charge of a battery includes measurement of an electric parameter of the battery during a charging or discharging phase of the battery followed by placing the battery in open circuit during a rest period. During the rest period, at least two values of the voltage at the battery terminals are measured. An indicator is then calculated according to the electric parameter and to values of the voltage measured during the rest period, and the state of charge corresponding to this indicator is then determined by means of a calibration curve representative of the variations of the indicator as a function of the state of charge of the battery.Type: GrantFiled: October 28, 2009Date of Patent: September 2, 2014Assignees: Commissariat a l'Energie Atomique et aux Energies Alternatives, Institut Polytechnique de GrenobleInventors: Remy Mingant, Christine Lefrou, Yvan Reynier
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Patent number: 8102179Abstract: The method for determining the state of charge of a battery can be used during charging or discharging of the battery at constant current. It comprises placing the battery in open circuit during a recovery period until the voltage at the terminals of said battery stabilizes at a voltage plateau. Then a constant test voltage is applied to the battery terminals during a preset test period. The state of charge of the battery corresponds to the current measured at the end of the test period by means of a previously obtained calibration curve.Type: GrantFiled: July 9, 2009Date of Patent: January 24, 2012Assignee: Commisariat A L'Energie AtomiqueInventors: Rémy Mingant, Sébastien Martinet, Christine Lefrou
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Patent number: 8093866Abstract: The management method comprises a charging phase and may comprise an optional prior phase of estimating the state of charge of the battery. Comparison of the absolute value of the slope of the voltage at the battery terminals with a full-charge threshold at the end of each period, when a pulsed current is applied, is used as end-of-charging criterion in the charging phase and/or as full-charge criterion in the phase of estimating the state of charge. The charging phase by pulsed current is interrupted when the slope reaches the full-charge threshold. This same comparison constitutes the criterion for estimating the necessity for going to a charging step after the prior phase of estimating the state of charge of the battery.Type: GrantFiled: November 5, 2007Date of Patent: January 10, 2012Assignee: Commissariat a l'Energie AtomiqueInventors: Fathia Karoui, Elisabeth Lemaire, Christine Lefrou
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Publication number: 20110215761Abstract: The method for determining the state of charge of a battery includes measurement of an electric parameter of the battery during a charging or discharging phase of the battery followed by placing the battery in open circuit during a rest period. During the rest period, at least two values of the voltage at the battery terminals are measured. An indicator is then calculated according to the electric parameter and to values of the voltage measured during the rest period, and the state of charge corresponding to this indicator is then determined by means of a calibration curve representative of the variations of the indicator as a function of the state of charge of the battery.Type: ApplicationFiled: October 28, 2009Publication date: September 8, 2011Applicants: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, INSTITUT POLYTECHNIQUE DE GRENOBLEInventors: Remy Mingant, Christine Lefrou, Yvan Reynier
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Publication number: 20100060240Abstract: The management method comprises a charging phase (F2, F3) and may comprise an optional prior phase (F1) of estimating the state of charge of the battery. Comparison of the absolute value of the slope (P) of the voltage at the battery terminals with a full-charge threshold at the end of each period, when a pulsed current is applied, is used as end-of-charging criterion in the charging phase and/or as full-charge criterion in the phase of estimating the state of charge. The charging phase by pulsed current (F3) is interrupted when the slope (P) reaches the full-charge threshold. This same comparison constitutes the criterion for estimating the necessity for going to a charging step (F2, F3) after the prior phase (F1) of estimating the state of charge of the battery.Type: ApplicationFiled: November 5, 2007Publication date: March 11, 2010Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUEInventors: Fathia Karoui, Elisabeth Lemaire, Christine Lefrou
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Publication number: 20100007309Abstract: The method for determining the state of charge of a battery can be used during charging or discharging of the battery at constant current. It comprises placing the battery in open circuit during a recovery period until the voltage at the terminals of said battery stabilizes at a voltage plateau. Then a constant test voltage is applied to the battery terminals during a preset test period. The state of charge of the battery corresponds to the current measured at the end of the test period by means of a previously obtained calibration curve.Type: ApplicationFiled: July 9, 2009Publication date: January 14, 2010Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUEInventors: Remy Mingant, Sebastien Martinet, Christine Lefrou
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Patent number: 5822107Abstract: A process for electrical power supply of at least one electrically drivable glazing of the electrochromic type for the purpose of causing variation of the state of coloration thereof. An electrical drive circuit includes an electrical connection to connect electrically conductive layers of the glazing to the drive circuit. An electricity generator supplies power to the electrochromic glazing under instruction of a control unit equipped with a user interface, and which utilizes a counter for counting a time and which measures and computes physical characteristics of the drive circuit and of the glazing, including at least measuring the electrical voltage between two distinct points of the electrochromic structure of the glazing, and measuring the electric current and measuring the state of coloration of the glazing.Type: GrantFiled: December 26, 1995Date of Patent: October 13, 1998Assignee: Saint-Gobain VitrageInventors: Christine Lefrou, Didier Perrin
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Patent number: 5793518Abstract: An electrochromic system comprising a transparent electrically conducting film (2), a film (3) of a cathodic electrochromic material, which is capable of reversibly inserting M.sup.+ cations of type H.sup.+ or Li.sup.+, an electrolyte film (5), counter-electrode film (7) made of an anodic electrochromic material, and a second electrically conducting film (8), said structure having a barrier film (6) interposed between electrolyte (5) and the counter-electrode (7), which barrier film is open to the diffusion of the M.sup.+ cations and which is constituted of the following materials selected from the group consisting of oxides of metals of Group VB of the Periodic Table, mixtures of these oxides, CeF.sub.3, Sb.sub.2 O.sub.3, HUP (hexauranylphosphate), Cr.sub.2 O.sub.3, ZrO.sub.2, and an ion conductor material of Li.sub.3 N, LiTaO.sub.3, LiAlF.sub.4, Li.sub.3 PO.sub.4, LiBO.sub.2 or LiNbO.sub.3.Type: GrantFiled: June 4, 1997Date of Patent: August 11, 1998Assignee: Saint-Gobain Vitrage InternationalInventors: Christine Lefrou, Francis Defendini, Florence Garot, Odile Marrot
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Patent number: 5694144Abstract: Electrochromic systems having a material, whose coloration state and/or the transmission in certain electromagnetic radiation wavelengths varies by performing an electrochemical reaction involving the passage of an electric current. The electric current is generated by an intensity generator able to supply a current, whose intensity obeys a reference value determined as a function of the number of charges to be transferred for switching from the initial coloration state to the desired coloration state and as a function of the time chosen for the switching. The system also relates to using a power supply in an electrochromic glazing process.Type: GrantFiled: May 15, 1995Date of Patent: December 2, 1997Assignee: Saint-Gobain VitrageInventors: Christine Lefrou, Marc Ast
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Patent number: 5663829Abstract: An electrochromic system comprising a transparent electrically conducting film (2), a film (3) of a cathodic electrochromic material, which is capable of reversibly inserting M.sup.+ cations of type H.sup.+ or Li.sup.+, an electrolyte film (5), counter-electrode film (7) made of an anodic electrochromic material, and a second electrically conducting film (8), said structure having a barrier film (6) interposed between electrolyte (5) and the counter-electrode (7), which barrier film is open to the diffusion of the M.sup.+ cations and which is constituted of the following materials selected from the group consisting of oxides of metals of Group VB of the Periodic Table, mixtures of these oxides, CeF.sub.3, Sb.sub.2 O.sub.3, HUP (hexauranylphosphate), Cr.sub.2 O.sub.3, ZrO.sub.2, and an ion conductor material of Li.sub.3 N, LiTaO.sub.3, LiAlF.sub.4, Li.sub.3 PO.sub.4, LiBO.sub.2 or LiNbO.sub.3.Type: GrantFiled: June 13, 1994Date of Patent: September 2, 1997Assignee: Saint-Gobain Vitrage InternationalInventors: Christine Lefrou, Francis Defendini, Florence Garot, Odile Marrot