Patents Assigned to Ecole Polytechnique
  • Patent number: 9087683
    Abstract: In an electrostatic spray ionization method for spraying a liquid layer from an insulating plate 2, the plate is arranged between two electrodes 1, 4. A constant high voltage power supply 3 is provided and an electric circuit is used to charge and discharge locally a surface of the liquid layer 7 on the insulating plate 2 by applying the power supply between the electrodes 1, 4.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: July 21, 2015
    Assignee: Ecole Polytechnique Federale de Lausanne
    Inventors: Hubert Hugues Girault, Baohong Liu, Yu Lu, Liang Qiao, Romain Sartor, Elena Tobolkina
  • Patent number: 9085190
    Abstract: A method and computing system are proposed for producing an authenticable security device with two sides. The verso side is covered with an adjustable luminescent emissive layer formed by invisible luminescent ink halftones and possibly a UV absorbing printed layer. The recto side is covered with transmissive non-luminescent ink halftones. The backlit colors resulting from the emissions of the luminescent layer or resulting from illumination by normal white light through the transmissive non-luminescent ink halftones are predicted by a backlighting model. This model enables computing the surface coverages of the luminescent and/or non-luminescent ink halftones in order to obtain a desired color either under excitation light (UV light) or under normal white light. This enable creating authenticable backlit images substantially similar to pre-stored reference images, either under normal white light, under excitation light, or under both the normal white light and the excitation light.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: July 21, 2015
    Assignee: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
    Inventors: Julien Andres, Roger D. Hersch
  • Publication number: 20150200377
    Abstract: The present invention provides a solid state heterojunction solar cell comprising a transparent conducting support layer (2,3), on which a nanostructured, surface-increasing scaffold structure is provided, wherein an organic-inorganic perovskite layer (4) is provided on said scaffold structure, and wherein a counter electrode and/or metal layer (5) is provided in electric contact with said perovskite layer (4). According to an embodiment, the solar cell lacks an electrolyte or any hole conducting material. The invention also relates to a solid state ' heterojunction and to a method of preparing the solar cell.
    Type: Application
    Filed: July 24, 2013
    Publication date: July 16, 2015
    Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Lioz Etgar, Mohammad Khaja Nazeeruddin, Michael Graetzel
  • Publication number: 20150198793
    Abstract: The present invention relates to a reflective optical objective (1) comprising: —a first reflecting element (3) including a front surface (3a) and a hack surface (3b), the front surface (3a) including a convex reflecting surface (11); and —a second reflecting element (5) including a concave reflecting surface (13) facing the convex reflecting surface (11) of the first reflecting element (3), the second reflecting element (5) including a transmissive section (7) permitting electromagnetic radiation to pass through the concave reflecting surface (13) of the second reflecting element (5) to the first reflecting element (3). The reflective optical objective (1) is characterised in that the reflective optical objective (1) includes a carrier material (9) embedding at least the front surface (3a) of the first reflecting element (3) and defining the distance (d) between the first (3) and second (5) reflecting elements.
    Type: Application
    Filed: July 15, 2013
    Publication date: July 16, 2015
    Applicant: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
    Inventors: Davor Kosanic, Bastien Rachet, Victor Cadarso, Juergen Brugger
  • Patent number: 9072906
    Abstract: A preferred frequency is identified, being usable to stimulate a neurological target within a mammalian body using at least one microelectrode positioned at or near the target. To establish efficient and effective stimulation, an impedance analyzer is provided for measuring electrical impedance values indicative of a microelectrode-tissue interface across a range of different frequencies. A preferred one of the measured electrical impedance values is identified as being closest to a pure resistance. The neurological target can then be stimulated at or near the frequency associated with the preferred impedance value (peak resistance frequency), thereby promoting desirable traits, such as optimum charge transfer, minimum signal distortion, increased stimulation efficiency, and prevention of microelectrode corrosion. The peak resistance frequency can be used to determine an preferred pulse shape.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: July 7, 2015
    Assignee: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
    Inventors: Andre Mercanzini, Philippe Renaud
  • Patent number: 9075227
    Abstract: The invention relates to large-field high-resolution microscopy and photolithography setups operating with polychromatic light. It includes the use of a plurality of focusing micromirrors.
    Type: Grant
    Filed: January 23, 2010
    Date of Patent: July 7, 2015
    Assignee: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
    Inventors: Bastien Rachet, Fabrice Merenda, René Salathe
  • Publication number: 20150181360
    Abstract: The present invention concerns a method for calibrating an array of receivers (ri), each receiver being configured for receiving a signal transmitted by at least one transmitter (si), and echoes of the transmitted signal as reflected by one or more reflective surfaces (w), said method comprising the following steps: sorting said echoes, by assigning each echo to a reflective surface or to a combination of reflective surfaces (w) calibrating said array of receivers (ri) based on said sorting.
    Type: Application
    Filed: March 3, 2014
    Publication date: June 25, 2015
    Applicant: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
    Inventors: Ivan DOKMANIC, Laurent DAUDET, Martin VETTERLI
  • Publication number: 20150144184
    Abstract: The present invention relates to a solar cell comprising a semiconductor wafer, an emitter formed by at least one emitter region which comprises at least a first layer of a first conductivity type and a first contact layer allowing a carrier extraction or injection, a backcontact comprising at least a second layer of a second conductivity type opposite of said first conductivity type and a second contact layer allowing a carrier extraction or injection, electrical contacts which are connected to said emitter regions and said backcontact respectively and designed to transport an electrical current out of the solar cell. According to the invention, the area of the emitter covers between 0.
    Type: Application
    Filed: June 29, 2012
    Publication date: May 28, 2015
    Applicant: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
    Inventors: Christophe Ballif, Jonas Geissbuhler
  • Patent number: 9042009
    Abstract: The invention relates to a passive device for the coherent combination of at least two optical amplifiers. According to the invention, said device comprises an interferometer having at least four branches (B1, B2, B3, B4) and comprising optical means for separating and combining polarization, said means having four inlet-outlet ports that are respectively connected to a branch.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: May 26, 2015
    Assignee: ECOLE POLYTECHNIQUE
    Inventors: Dimitris Papadopoulos, Marc Hanna, Louis Daniault
  • Publication number: 20150137068
    Abstract: A junctionless Nano-Electro-Mechanical (NEM) resonator, comprising a highly doped conductive channel connecting a drain region and a source region; the conduction channel region is movable and the overall structure is fixed at least at these two ends placed on acting the source and drain regions, respectively; at least one fixed gate electrode arranged to control a depletion charge in the highly doped conductive channel thereby modulating dimensions of a cross-section of the highly doped conductive channel. A dimension of the cross-section in the direction of an electrical field that is oriented from the fixed gate electrode to the highly doped conductive channel, is designed in such a way that it can be reduced under the effect of the depletion charge such that a full depletion in the highly doped conductive channel is achievable with the control of the fixed gate electrode.
    Type: Application
    Filed: April 19, 2013
    Publication date: May 21, 2015
    Applicant: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
    Inventors: Sebastian Thimotee Bartsch, Mihai Adrian Ionescu
  • Patent number: 9018199
    Abstract: The present invention relates to organometallic compounds useful in the treatment of metastasis. The organometallic compounds comprise a ligand that is covalently bound to a bioactive compound, which is an inhibitor of a resistance pathway or a derivative thereof. Preferably, the organometallic compounds are half-sandwich (“piano-stool”) compounds. The compounds of the present invention offer a high variability with respect to the bioactive compound and to the nature of the ligand bound to a central transition metal.
    Type: Grant
    Filed: May 9, 2007
    Date of Patent: April 28, 2015
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Paul Joseph Dyson, Wee Han Ang
  • Publication number: 20150108617
    Abstract: A method for chemically passivating a surface of a product made of a III-V semiconductor material in which a) a P(N) polymer film is formed by deposition in a solvent comprising liquid ammonia. The film is formed by deposition, without electrochemical assistance, in the solvent, in the presence of an oxidizing chemical additive comprising phosphorous and generating electrical charge carriers in said surface.
    Type: Application
    Filed: June 12, 2012
    Publication date: April 23, 2015
    Applicants: Centre National de la Recherche Scientifique-CNRS, Universite de Versailles Saint-Quentin-En-Yvelines, Ecole Polytechnique
    Inventors: Francoise Hervagault, Elaine Le Floch, Clemence Le Floch, Paul Le Floch
  • Patent number: 9015566
    Abstract: In bus communications methods and apparatus, a first set of physical signals representing the information to be conveyed over the bus is provided, and mapped to a codeword of a spherical code, wherein a codeword is representable as a vector of a plurality of components and the bus uses at least as many signal lines as components of the vector that are used, mapping the codeword to a second set of physical signals, wherein components of the second set of physical signals can have values from a set of component values having at least three distinct values for at least one component, and providing the second set of physical signals for transmission over the data bus in a physical form.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: April 21, 2015
    Assignee: École Polytechnique Fédérale de Lausanne
    Inventors: Harm Cronie, Amin Shokrollahi
  • Publication number: 20150098313
    Abstract: A computer-implemented method for determining the Walsh-Hadamard transform of N samples of a signal, comprises electing a plurality of hashing C matrices ?1, . . . ?C, computing C hashes of a particular length based at least on a hashing front end and the plurality of matrices ?1, . . . ?C, forming a bipartite graph with a plurality of variable nodes and a plurality of check nodes, the variable nodes being non-zero coefficients to recover, and the check nodes being hashed samples, finding an isolated check node and recovering non-zero coefficients connected to the isolated check node by employing collision detection and support estimation of the signal, peeling from the bipartite graph the recovered non-zero coefficients, and repeating the computing step, forming step, finding step and peeling step until all the nodes in the plurality of check nodes are zero.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 9, 2015
    Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Robin SCHEIBLER, Saeid HAGHIGHATSHOAR, Martin VETTERLI
  • Publication number: 20150085892
    Abstract: A method for producing electromagnetic radiation comprising: firing a first laser pulse and generating a plasma region, the first laser pulse penetrating at least partially into the plasma region to create a plasma density wake in the plasma region; providing a group of charged particles in the plasma region arranged so as to be accelerated in the plasma density wake of the first laser pulse; reflecting the first laser pulse after the first laser pulse has penetrated into the plasma region, to give a reflected laser pulse; and arranging the reflected laser pulse to interact with the group of charged particles to generate an electromagnetic radiation.
    Type: Application
    Filed: April 11, 2013
    Publication date: March 26, 2015
    Applicants: ECOLE POLYTECHNIQUE, Ecole Nationale Superieure de Techniques Avancees, Centre National De La Recherche Scientifique- CNRS
    Inventors: Kim Ta Phuoc, Cedric Thaury, Rahul Shah, Sebastien Corde
  • Patent number: 8986842
    Abstract: The present invention concerns a color conversion film comprising at least one active layer, said layer comprising an organic fluorescent dye containing a fluorescent core, wherein said dye is substituted with at least one polymer segment. It also concerns its method of preparation.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: March 24, 2015
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Holger Frauenrath, Rolando Ferrini, Libero Zuppiroli, Stéphane Suarez, Roman Niklaus Marty, Justin Gerard McMullen, Michael Schär
  • Patent number: 8968838
    Abstract: A method is provided for exciting at least one electrode of a capacitively coupled reactive plasma reactor containing a substrate. The electrode is excited by applying a RF voltage with a trapezoidal waveform comprising a ramp-up, a high plateau, a ramp-down and a low plateau. The plasma density can be controlled by adjusting the duration of the ramp-up, the duration of the ramp-down, the amplitude and the repetition rate of the trapezoidal waveform. The ion energy distribution function at the substrate can be controlled by adjusting the amplitude and the relative duration between the high plateau and the low plateau of the trapezoidal waveform.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: March 3, 2015
    Assignees: Ecole Polytechnique, Centre National de la Recherche Scientifique
    Inventors: Jean-Paul Booth, Erik Johnson
  • Patent number: 8966453
    Abstract: An execution of a target software program that causes a particular bug to manifest itself is generated. A target software program is received. A bug report generated by an execution of the target software program is received. The bug report describes a particular bug within the target software program. A bug type of the particular bug is received. A synthesized execution file is generated based on the target software program, the bug report, and the bug type. The synthesized execution file specifies an execution of the target software program that causes the particular bug to manifest itself.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: February 24, 2015
    Assignee: Ecole Polytechnique Fédérale de Lausanne
    Inventors: Cristian Zamfir, George Candea
  • Patent number: 8963546
    Abstract: A method for performing magnetic resonance spectroscopy on solid samples containing nuclei of interest with spin quantum number I subjects the sample to a static magnetic field. The sample is spun at the magic angle and broad-band excitation of transverse magnetization of the nuclei of interest is effected by applying a first train of rotor-synchronized rf-pulses, having a carrier frequency, to the nuclei of interest with a pulse duration 0.1 ?s<?p<2 ?s, the first train of rf-pulses comprising k·n pulses extending over k rotor periods ?rot with n pulses per rotor period ?rot, wherein n is an integer n>1. Uniform excitation of a great number of spinning sidebands or families of sidebands that arise from large first-order quadrupole or hyperfine interactions is enabled and signal intensity is thereby improved.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: February 24, 2015
    Assignees: Bruker BioSpin AG, Ecole Polytechnique Fédéral de Lausanne (EPFL)
    Inventors: Simone Ulzega, Veronika Vitzthum, Geoffrey Bodenhausen, Marc Anthony Caporini
  • Patent number: 8962977
    Abstract: The present invention provides novel dyes for dye sensitized photovoltaic conversion devices. The dyes contain novel anchoring ligands, which have a vinyl or phenylethenyl moiety incorporated in the anchoring bipyridine. Such dyes exhibit an increased molar extinction coefficient and enhanced red response in the visible regions.
    Type: Grant
    Filed: November 11, 2009
    Date of Patent: February 24, 2015
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Mohammad Nazeeruddin, Michael Graetzel