Patents Assigned to L'Etat Francais
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Patent number: 5083013Abstract: The station, in particular a terminal, comprises an oscillator (OS) having a feedback loop (1) and a station inductor element (L10) suitable for conferring a working frequency to the oscillator which varies relative to a rest frequency. The station also includes a station processor connected to the oscillator and capable of processing variations in the working frequency of the oscillator. The portable object, in particular a memory card, includes an electronic circuit which is switchable between an inactive state and an active state in which it sets up a resonant circuit tuned on a frequency which is distinct from the rest frequency while remaining suitable for being coupled inductively with the feedback loop (1) at the rest frequency. The portable object also includes an object processor capable of switching the electronic circuit as a function of the information to be transmitted to the station.Type: GrantFiled: December 18, 1989Date of Patent: January 21, 1992Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications)Inventor: Philippe Levionnais
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Patent number: 5081004Abstract: Method for producing a display screen with a matrix of transistors provided with an optical mask. This method consists of depositing on a substrate (100) a layer of black polyimide (102) absorbing the visible light and followed by a layer of photosensitive resin, of insolating the resin through a mask masking the channels of the transistors to be embodied, of eliminating the zones insolated with the resin and the sub-adjacent zones of the polyimide, of depositing an ITO layer (106) on the unit, of eliminating the rest of the resin and the ITO surmounting said resin so as to form the drains/sources of the transistors, of successively depositing a layer of hydrogenated amorphous silicon (110), a layer of silicon nitride (112) and a layer of aluminium (114), then of photoengraving the stack of these layers so as to form the grid of the transistors, and finally to render passive the unit with a layer of silicon (116).Type: GrantFiled: November 2, 1989Date of Patent: January 14, 1992Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National D'Etudes des TelecommunicationsInventors: Bruno Vinouze, Hugues Lebrun
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Patent number: 5079178Abstract: The process of the invention consists of subjecting a metal oxide coating (106, 108), located on a glass substrate (100), to the action of a gaseous plasma (109) containing 10 to 88% by volume of hydrogen, 2 to 30% by volume of a hydrocarbon and 10 to 50% of an inert vector gas, bringing about the formation of a polymer coating (110) on the parts of the substrate not provided with oxide, by dissocation of the gaseous mixture, and the partial chemical etching of the oxide (106, 108) by the formation of organometallic compounds.Type: GrantFiled: December 8, 1989Date of Patent: January 7, 1992Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications)Inventors: Yannick Chouan, Jean-Luc Favennec
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Patent number: 5077542Abstract: A system of transmission with amplitude modulation for the transmission of signals of all types, analog and/or digital, requiring high performance characteristics with respect to the noise induced by the transmission channel, comprising, at transmission, means for the suppressed carrier amplitude modulation of a useful signal and means for the amplitude modulation, in phase quadrature with said modulated useful signal, of a service signal, making it possible, at reception, to remove the ambiguity on the polarity of the demodulated useful signal. Thus it enables the transmission of signals in suppressed carrier modulation mode, hence with a good signal-to-noise ratio, without losing the polarity of the signal. The transmitters and receivers according to the invention also enable the transmission and reception of the signals modulated in SCAM, VSBAM or VSBSCAM modes.Type: GrantFiled: December 7, 1990Date of Patent: December 31, 1991Assignees: L'Etat Francais (CNET), Telediffusion de France S. A.Inventor: Marc Lanoiselee
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Patent number: 5075251Abstract: A process for forming tungsten or molybdenum silicide on silicon apparent regions (6) of a silicon wafer surface (1) also comprising oxidized regions (2) includes the steps consisting in uniformly coating the wafer with a tungsten or molybdenum layer (10) and annealing at a temperature ranging from 700.degree. C. to 1000.degree. C. The annealing step is carried out in presence of a low pressure gas forming a chemical composite with tungsten or molybdenum. The composite is then selectively etched.Type: GrantFiled: September 8, 1989Date of Patent: December 24, 1991Assignee: L'Etat FrancaisInventors: Joaquim Torres, Jean Palleau, Noureddine Bourhila
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Patent number: 5074955Abstract: Process for the anisotropic etching of a III-V material and application to surface treatment for epitaxial growth.This process includes the step of etching a III-V material (2) by reactive ionic etching using a gaseous mixture containing by volume 20 to 30% of at least one gaseous hydrocarbon, 30 to 50% of at least one inert gas and 20 to 50% of hydrogen.Said etching can be performed locally with the aid of a Si.sub.3 N.sub.4 etching mask (4a).Type: GrantFiled: August 17, 1990Date of Patent: December 24, 1991Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (C.N.E.T.)Inventors: Loic Henry, Claude Vaudry
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Patent number: 5071220Abstract: Joint closure modules and boxes for optical fiber cables, also known as splice organizers, the module having a supporting plate demarcating a shielded space of extension of the fiber transfer sections, said supporting plate including, firstly, a set of aligned and separate means for anchoring the external sheath, the peripheral reinforcements and the central strength element, respectively, of each cable and, secondly, at least one fiber coiling and connection cartridge with guided hinging, arranged so as to limit the transfer length and the course of shift of said sections for the transfer of the guided shift of said hinged cartridge.Type: GrantFiled: April 30, 1990Date of Patent: December 10, 1991Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et des l'Espace (Centre National d'Etudes des Telecommunications)Inventors: Yves Ruello, Regis Petit, Gerard Ayoul
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Patent number: 5063567Abstract: Photoreceptor for frequency-modulated optical signals. The photoreceptor consists of a semiconductor laser (10) fed clearly beyond the threshold (12). The optical signal (20) to be demodulated is injected into the laser. The voltage (V) taken at the terminals of the latter reflects the frequency difference between the frequency of the signal (F1, F2) and the actual frequency (Fo) of the laser.Type: GrantFiled: September 14, 1990Date of Patent: November 5, 1991Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications)Inventor: Hisao Nakajima
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Patent number: 5055739Abstract: A memory effect, monochromatic display of the photoconductor-electroluminescent type, includes on a substrate an electroluminescent layer and a photoconductor layer in stacked relation. The stack is interposed between two electrode systems used for exciting the electroluminescent layer, the latter having an emission spectrum overlapping the sensitivity spectrum of the photoconductor material. An optical filter is located between the electroluminescent layer and the display observer and permits the passage of that part of emission spectrum of the electroluminescent layer most useful for display purposes while blocking a region of the emission spectrum of the ambient illumination, the sensitivity spectrum of the photoconductor layer then being essentially contained in said region.Type: GrantFiled: February 8, 1990Date of Patent: October 8, 1991Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre National d'Etudes des Telecommunications)Inventor: Pascal Thioulouse
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Patent number: 5052305Abstract: The technical field of the invention is that of spin-stabilized subcaliber rojectiles including a core integral with a sabot, and a sleeve.The sleeve includes a rear annular area lodged in a corresponding groove in the sabot and providing gastightness, wherein:the sabot includes, toward the front of the projectile, a cylindrical crown having an edge bordering the band groove;the crown includes at least three notches, separated by castellations, and extending axially at least to the band groove;the sleeve follows a profile complementary to that of the sabot, so that it enters into the notches;and the projectile possesses means for separating the sleeve into several sectors under the effect of the centrifugal force, at the time the projectile leaves the gun muzzle.Application to medium-caliber ammunition.Type: GrantFiled: October 26, 1990Date of Patent: October 1, 1991Assignee: L'Etat Francais represente par le Delegue Ministeriel pour l'ArmementInventors: Francois A. Chiarelli, Jean-Louis Chazeirat, Jean-Pierre Boisnard
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Patent number: 5046074Abstract: The invention enables extremely quick and reliable recovery of the synchronization of a communication signal transmitted in a half-duplex link. Such a communication signal comprises first time intervals including useful data, and second time intervals devoid of useful data and in a given logic state. At the beginning of each of the first time intervals is included a digital synchronization pattern which is then considered as associated with the second time intervals to form synchronization words of great length. The synchronization of the communication signal is recovered by detecting the synchronization words of great length in the communication signal.Type: GrantFiled: August 16, 1989Date of Patent: September 3, 1991Assignee: L'Etat Francais represente par le Ministre des Postes, des Telecommunications et de l'Espace (Centre d'Etudes des Telecommunications)Inventors: Jacques Abiven, Gilles Ramel
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Patent number: 5043953Abstract: This pressure compensating device for a volume of immersed gas is equipped with mobile or deformable walls and includes an immersed compensation bladder. The bladder is secured in a housing and communicates with the volume to be compensated. It is arranged by mounting means roughly at the level of the volume. According to the invention, the housing mounting means for the compensation bladder are arranged to allow the housing to move vertically relative to the gas volume so as to keep the mean front of the bladder folds at the level of the surfaces to be compensated, as the volume may be immersed to different depths.The housing mounting means include an arm hinged about a horizontal axis, and a spring exerting its force on a cable connected to the hinged arm.Depending on the preferred application, the mobile walls enclosing volume to be compensated consist of the acoustic drives of underwater electroacoustic transducers.Type: GrantFiled: August 14, 1990Date of Patent: August 27, 1991Assignee: L'Etat Francais represente par le Delegue General Ministeriel pour l'ArmementInventors: Vincent Amiand, Yves Chauvin
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Patent number: 5043806Abstract: A three-dimensional television system uses a method of processing and transmitting a sequence of pairs of stereoscopic television images by means of a transmission link comprising and analog video channel associated with a digital channel to reconstitute at the receiving end a compatible image or a three-dimensional image. The analog video channel transmits a compatible video image formed by multiplexing image items of righthand and lefthand images of pairs of stereoscopic images from the sequence.Type: GrantFiled: July 25, 1990Date of Patent: August 27, 1991Assignees: L'Etat Francais represente par le Ministre des P.T.T., Telediffusion de FranceInventors: Bruno Choquet, Danielle Pele, Francoise Chassaing
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Patent number: 5042073Abstract: A system embodying the invention for verifying signatures appended to bank checks comprises a check feed stand, a CMC7 code reader, a video camera and a control equipment. The checks are conveyed across the stand and are read in turn by the code reader and the camera which respectively issue the identity of the account holder and an image of the signature appended to the check. The control equipment is preferably comprised of a microcomputer in which algorithms are resident to authenticate the signatures by comparison with previously recorded reference signatures. The signatures are represented by static parameters relating to the shapes and dimensions of their drawings. The verification method embodying the invention therein comprises an optimization algorithm resident in the control equipment in order to specifically select for each signature the parameters that should be used to minimize a decision error.Type: GrantFiled: June 27, 1990Date of Patent: August 20, 1991Assignee: L'Etat Francais represente par le Ministre des Postes et Telecommunications (Centre National d'Etudes des Telecommunications)Inventors: Richard Collot, Mohammed Achemlal, Marie-Josephe Revillet
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Patent number: 5041908Abstract: A method for the regulation of the throughput of assistance data is provided. The assistance date assists in the reconstruction of subsampled moving electronic images. The method is particularly useful for HDTV transmission by a HMAC channel. For each elementary block of the image, an optimal processing operation is selected from first and second parallel processing operations. The second processing operation includes an image filter, and the first processing operation includes a motion compensation process. The first processing operation generates a larger data throughput rate of assistance data than the second processing operation. If the throughput rate of assistance data approaches or exceeds the maximum throughput rate permitted for a transmission unit, the second processing operation which produces a smaller data throughput rate is automatically selected.Type: GrantFiled: June 21, 1989Date of Patent: August 20, 1991Assignees: L'Etat Francais (CNET), Telediffusion de FranceInventor: Jean-Pierre Henot
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Patent number: 5015051Abstract: Integrated single-mode isolator waveguide having a heating means (3) making it possible to increase the efficiency of the isolator (1). The invention also provides for an intermediate layer (5) located between the guide layer (1) and the substrate (2). Application: coupling of laser diodes to operation circuits.Type: GrantFiled: December 7, 1988Date of Patent: May 14, 1991Assignees: Thomson-CSF, L'Etat FrancaisInventors: Jean-Paul Castera, Paul-Louis Meunier, Alain Carenco, Jean-Marie Dupont, Pierre Friez
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Patent number: 5008924Abstract: A telecommunications terminal is provided which has a central unit (100) and a handset (200). The handset houses a microphone (210) and a speaker (220) and is connected to the central unit via a cord (300). The connecting cord has a plurality of wires (301-304) for conveying output signals from the microphone and input signals to the speaker. The telecommunications terminal incorporates at least one function under the manual control of its user. That function is controlled by a switching means (l1, l2; 230) housed in the handset, with the corresponding control signals being conveyed along said cord in the form of phantom D.C. voltages.Type: GrantFiled: July 24, 1989Date of Patent: April 16, 1991Assignee: L'Etat FrancaisInventors: Jacques Guichard, Georges Buchner, Jacques Labat
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Patent number: 4993024Abstract: A system and process for controlling the flow of packets carried by asynchronous time multiplex (EPACi) channels. The packets from one communication link are identified by their label and the identity of the multiplex channels which carries them. The process is comprised of allocating for each communication a predetermined clock rate and a predetermined threshold value, measuring the difference between the number of packets entering belonging to the communication and the number of pulses generated by the clock, lower bounding this difference, and, if the difference reaches a predetermined threshold, triggering a signal (DEP) which causes the detection of packets belonging to the communication in question as long as the difference is not less than the predetermined threshold.Type: GrantFiled: April 18, 1988Date of Patent: February 12, 1991Assignee: L'Etat Francais represente par le Ministre des PTT Centre National d'Etudes des Telecommunications 5CNetInventors: Jean-Paul Quinquis, Michel Servel, Joel Francois
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Patent number: 4961221Abstract: An information encryption method particularly intended for a communication system in which bidirectional multiplexed communications of the point-to-multipoint type are derived between a switching exchange and plural terminal stations. The switching exchange transmits first multiplexed words respectively destined for the terminal stations. The terminal stations supply second words which are multiplexed and transmitted towards the switching exchange. In the switching exchange, informations concerning transmission errors detected in the second words are derived and transmitted towards the terminal stations, and the first words are encrypted as a function of second words previously received free of transmission error in the switching exchange. In each of the terminal stations, the informations concerning the transmission errors are detected, and the second words transmitted from the terminal station and received free of transmission error by the switching exchange are memorized.Type: GrantFiled: December 12, 1989Date of Patent: October 2, 1990Assignee: L'Etat Francais represente par le Ministre des Poste, Telecommunications et de l'Espace (Centre National d'Etudes des TelecommunicationsInventor: Jacques Abiven
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Patent number: 4955030Abstract: A double heterostructure stack comprising confinement layers (CC) enclosing active layers (CA) is formed on a substrate (S), e.g. a N+ type gallium arsenide substrate. Selective etching is performed so as to lay bare the confinement layers at different depths, e.g. CC4, CC3, CC2. The confinement layers initially receive contact layers (CP) made of P-type gallium arsenide. Regions R1, R2, and R3 are formed through the contact layers to constitute junctions with the uppermost active layers (respectively CA1, CA2, CA3). Valleys (V10, V21, V32) are formed to isolate the above-defined elementary stacks. After a metal contact layer has been formed, and after the end surfaces have been optically prepared, a multi-wavelength laser device is obtained.Type: GrantFiled: June 13, 1989Date of Patent: September 4, 1990Assignees: L'Etat Francais represente par le Ministre des Postes et Telecommunications, Centre National d'Etudes des TelecommunicationsInventors: Louis Menigaux, Louis Dugrand