Patents by Inventor Alain Le Mehaute
Alain Le Mehaute 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: 6262306Abstract: New molecules having the general formula A:N—B, where A:N— is .alpha.-substituted conjugated cyclic amine, with N being the N atom; and B is an .alpha.-substituted cyclic radical. These materials have ferromagnetic properties and may be use in a variety of fields and particularly in any electromagnetooptical or magnetoresistive system.Type: GrantFiled: August 19, 1999Date of Patent: July 17, 2001Assignee: GemplusInventors: Christian Leriche, Alain Le Mehaute
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Patent number: 6180877Abstract: A device for transmitting electrical energy or electrical signals comprises a core, an outer conductor and a threshold characteristic dielectric material between the core and the outer conductor. The dielectric material comprises, at least in part, a material that is insulative if the electric field is below a particular threshold and conductive when the electric field exceeds a particular threshold, so as to prevent the transmission of signals for which the electric field is above the threshold. The configuration of the core and/or of the outer conductor is such that the external electric field threshold from which the material becomes conductive is significantly less than the intrinsic breakdown threshold of the material.Type: GrantFiled: September 9, 1997Date of Patent: January 30, 2001Assignee: Thomson-CSF CommunicationsInventors: St{acute over (e)}phane Lamesch, Jean-Louis Braut, Alain Le Mehaute, Denis Cottevieille
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Patent number: 6068081Abstract: A method for reducing the amplitude of vibration and the pressure wave (6) from a radiating surface (5) and/or an incident surface (3) of a material exposed to mechanical and/or acoustic vibration. The material consists of an anisotropically shaped heavy resilient structure with an internal geometry capable of deflecting and localizing vibration (7) within the structure. A specific material may be incorporated into the areas where vibrational energy is localized in order to convert the vibrational energy into another form of energy.Type: GrantFiled: April 1, 1998Date of Patent: May 30, 2000Assignee: Artec AerospaceInventors: Marc Capdepuy, Florent Haddad, Alain Le Mehaute
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Patent number: 6023201Abstract: An electrical signal transmission device includes a core and an outer conductor separated by a dielectric. To eliminate external radiated interference, for which the device behaves like a receiving antenna, the core, the outer conductor and/or the dielectric feature discontinuities forming impedance discontinuities. The discontinuities are chosen to prevent propagation towards the core of external interference waves in a particular range of frequencies.Type: GrantFiled: September 9, 1997Date of Patent: February 8, 2000Assignee: Alcatel CITInventors: Stephane Lamesch, Jean-Louis Braut, Alain Le Mehaute, Denis Cottevieille
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Patent number: 5847171Abstract: The invention is drawn to organic compounds of the general formulae L--A--Z or L--A'--L' as defined in the specification. The compounds are readily crystallizable and can be used for their ferromagnetic properties.Type: GrantFiled: September 16, 1997Date of Patent: December 8, 1998Assignee: Alcatel Alsthom Compagnie Generale D'ElectriciteInventors: Stanislas Galaj, Alain Le Mehaute
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Patent number: 5844069Abstract: The invention provides copolymers having magnetic properties, said copolymers containing aminoaromatic groups, and being based on a structural unit comprising:a first group of aminoaromatic compounds chosen from aniline derivatives and the corresponding iminoquinone forms; anda second group of substituted aminoaromatic compounds chosen from substituted amino compounds containing at least two condensed benzene rings, substituted polycyclic compounds containing at least one aniline structural unit in their structure, compounds derived from aniline and carrying a substituent bonded to the ring by means of an ethynylidene or paraphenylene link, and the corresponding iminoquinone compounds.Type: GrantFiled: December 29, 1994Date of Patent: December 1, 1998Assignee: Alcatel Alsthom Compagnie Generale D'ElectriciteInventors: Stanislas Galaj, Alain Le Mehaute
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Patent number: 5714622Abstract: The invention is drawn to organic compounds of the general formulae L--A--Z or L--A'--L' as defined in the specification. The compounds are readily crystallizable and can be used for their ferromagnetic properties.Type: GrantFiled: April 12, 1996Date of Patent: February 3, 1998Assignee: Alcatel Alsthom Compagnie Generale D'ElectriciteInventors: Stanislas Galaj, Alain Le Mehaute
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Patent number: 5637675Abstract: Crystalline compounds with ferromagnetic properties are described which are inclusion compounds comprising metal salts in copolymers in which the repeating unit includes one unit from a first group of aminoaromatic derivatives of 1-naphthylamine and corresponding oxidized forms, connected to one unit from a second group of substituted aminoaromatic compounds selected from substituted amines containing at least two condensed benzene nuclei, substituted polycyclic compounds containing at least one aniline moiety in their structure, and aniline derivatives carrying a substituent connected to the nucleus by an ethynylene or para-phenylene unit, and corresponding oxidized compounds. Methods for the preparation of these compounds are also described.Type: GrantFiled: May 2, 1995Date of Patent: June 10, 1997Assignee: Alcatel Alsthom Compagnie Generale d'ElectriciteInventors: Alain Le Mehaute, Stanislas Galaj, Denis Cottevieille, Fran.cedilla.ois Tsobnang, Fran.cedilla.ois Lefort
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Patent number: 5635582Abstract: The present invention concerns a magnetic copolymer having a structural unit comprising a first multivalent radical and a second multivalent radical derived from an aminoaromatic compound selected from a substituted amine containing at least two condensed benzene nuclei, a substituted polycyclic compound containing at least one aniline unit in its structure, and an aniline derivative substituted on the ring by an ethynylidene or paraphenylene side chain, these compounds being in their reduced or oxidized forms, said first and said second radical being coupled together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring, characterized in that said first radical is derived from a compound selected from 1-naphthylamine, which may be substituted, in its reduced or oxidized form.Type: GrantFiled: September 27, 1994Date of Patent: June 3, 1997Assignee: Alcatel Alsthom Compagnie Generale D'ElectriciteInventors: Stanislas Galaj, Alain Le Mehaute
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Patent number: 5530206Abstract: A coaxial cable intended to be used in the field of telecommunications comprises a metal core surrounded by at least two layers one of which is a dielectric material layer and the other of which, disposed between the core and the dielectric material layer over at least part of the length of the cable, is a semiconductor composite material layer comprising an insulative matrix and an undoped polymeric conductor containing conjugate bonds. The cable features intrinsic filtering of electromagnetic interference conducted by the cable at frequencies below 1 GHz.Type: GrantFiled: May 9, 1994Date of Patent: June 25, 1996Assignee: Alcatel CableInventors: Lydie Robert, Frederic Heliodore, Stanislas Galaj, Alain Le Mehaute
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Patent number: 5416155Abstract: The present invention relates to a material for semiconductive screening and to use of the material in manufacturing cables and capacitors, and in electromagnetic shielding of electrical and electronic apparatus. The present invention further relates to cables and electrical and electronic apparatus containing the material. The semiconductive screening is formed of a polymer matrix containing one or more polymers and in which matrix 5% to 70% (by weight) of at least one conjugated non-doped or dedoped polymer is to be found in the dispersed state. In the absence of an electric field, the conductivity of the screening is very low, but said conductivity is an increasing function of the applied field (see curves 2 to 9 in the figure).Type: GrantFiled: October 15, 1993Date of Patent: May 16, 1995Assignees: Alcatel Cable, SolvayInventors: Bernard Aladenize, Stanislas Galaj, Alain Le Mehaute, Etienne Hannecart, Claude Franquinet
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Patent number: 5408034Abstract: The invention provides copolymers having magnetic properties, said copolymers containing aminoaromatic groups, and being based on a structural unit comprising:a first group of aminoaromatic compounds chosen from aniline derivatives and the corresponding iminoquinone forms; anda second group of substituted aminoaromatic compounds chosen from substituted amino compounds containing at least two condensed benzene rings, substituted polycyclic compounds containing at least one aniline structural unit in their structure, compounds derived from aniline and carrying a substituent bonded to the ring by means of an ethynylidene or paraphenylene link, and the corresponding iminoquinone compounds.Type: GrantFiled: December 4, 1992Date of Patent: April 18, 1995Assignee: Alcatel Alsthom Compagnie Generale D'ElectriciteInventors: Stanislas Galaj, Alain Le Mehaute
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Patent number: 5371182Abstract: The present invention relates to self-doped conductive polyanilines and to a method of preparing them. The benzene and/or quinone rings of said polyanilines can be functionalized graft chains or substituents corresponding to the formula:--A--Zin which:A is a hydrocarbon radical having 2 to 8 atoms of carbon interrupted by at least 1 hetero atom; andZ is a strong acid function or a salt thereof.Type: GrantFiled: June 11, 1993Date of Patent: December 6, 1994Assignee: Alcatel N.V.Inventors: Stanislas Galaj, Alain Le Mehaute
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Patent number: 5312578Abstract: The invention concerns an electrically insulating body including at least two polymer materials and a method of making such a body. It is characterized in that its internal structure (61) is mainly formed by a first polymer material and that its surface structure (60, 62) is mainly formed by a second polymer material, said first polymer material having a higher molecular weight than said second polymer material. The proportion in the body of the first polymer material relative to the second polymer material reduces progressively from the internal structure (61) towards the surface structure (60, 62). The invention is applicable especially to insulating electric conductors (26) and enables insulators to be obtained having both a high dielectric strength and a good quality of shape.Type: GrantFiled: September 11, 1992Date of Patent: May 17, 1994Assignee: Alcatel N.V.Inventors: Bernard Aladenize, Alain Le Mehaute
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Patent number: 5293037Abstract: An opto-electronic converter comprises a mesoscopic resonant cavity constituted by a quantum wire made of a material that is a conductor or a semiconductor and situated between two electron mirrors of nanometer size, the said wire being interrupted over a gap having a width of a few tens of .ANG., into which gap a photosensitive material is inserted, tabs being provided at the ends of said cavity to pass an electrical current.Type: GrantFiled: July 20, 1992Date of Patent: March 8, 1994Assignee: Alcatel Alsthom Compagnie Generale d'ElectriciteInventors: Alain Le Mehaute, Christian Joachim
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Patent number: 5245474Abstract: The optical filter device comprises a stack of thin layers exhibiting a sequences h and g which defines a fractal organization. This device makes it possible to obtain spectrum lines which are extremely fine and very well resolved.Type: GrantFiled: November 20, 1991Date of Patent: September 14, 1993Assignee: Compagnie Generale d'ElectriciteInventors: Genevieve Chabassier, Jean-Michael Gabriagues, Frederic Heliodore, Alain Le Mehaute, Jacques Mouchart, Philippe Sautet
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Patent number: 5007016Abstract: A signal generator generates a temporal signal with a periodic configuration defined by an arrangement of seed patterns resulting from a branching construction iteratively using laws for composing several patterns and consisting in defining the periodic configuration of the signal as a component "a.sub.n " of the nth term Un with several components (a.sub.n, b.sub.n) of a recurrent sequence defined at the level of each of its components by a specific recurrent composition law, the initial term U0 having for its components the seed patterns (a.sub.0, b.sub.0). The temporal signals known as "fractal" signals result from a branching construction of this kind. The generator comprises a microprocessor (10) associated with a keyboard-display system (11), a read-only memory (12) for programs, a random access memory (13) and an output digital-to-analog converter (14).Type: GrantFiled: December 21, 1988Date of Patent: April 9, 1991Assignee: Compagnie Generale d'ElectriciteInventors: Alain Le Mehaute, Claude Roques-Carmes, Dalloul Wehbi, Jean-Francois Quiniou
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Patent number: 4965746Abstract: The temporal signal generated has a periodic configuration defined by an arrangement of seed patterns resulting from a branching construction employing n successive applications of m pattern type laws each defined by a specific arrangement of p pattern types. This construction amounts to defining a periodic signal configuration as a component "an" of the nth term Un with several components (an, bn) of a recurrent sequence defined at the level of its components by a particular recurrent composition law, the initial term UO having for its components the seed patterns (aO, bO). The temporal signals known by the name "fractal" result from a branching construction of this kind.Type: GrantFiled: December 20, 1988Date of Patent: October 23, 1990Assignee: Compagnie Generale d'ElectriciteInventors: Alain Le Mehaute, Jean-Francois Quiniou, Claude Roques-Carmes, Dalloul Wehbi, Antoine Derossis
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Patent number: 4664991Abstract: In a substance based on an electron conducting polymer, for use in a positive active material for electrochemical generators, for example, the polymer is of a one-dimensional character. The substance further comprises at least one polysulfurated chain forming a complex with the polymer.Type: GrantFiled: September 12, 1985Date of Patent: May 12, 1987Inventors: Alain Perichaud, Alain Le Mehaute
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Patent number: 4556614Abstract: A method of producing a solid electrolyte for an electrochemical cell, the cell comprising at least one first complexing polymer presenting in its monomer pattern at least one heteroatom and at least one ionizable alkaline salt complexed in the said polymer, wherein said complexing polymer is mixed with at least one second polymer miscible with the said complexing polymer and having cross-linkable functions; said cross-linkable functions then being physically cross-linked, with the complexing polymer being brought to an essentially amorphous state during said cross-linking operation.The electrolyte obtained can be used in electrochemical cells operating at ambient temperature.Type: GrantFiled: November 4, 1982Date of Patent: December 3, 1985Assignee: Compagnie Generale d'ElectriciteInventors: Alain le Mehaute, Thierry Hamaide, Gilles Crepy, Georges Marcellin