Patents Assigned to Societe Lignes Telegraphiques et Telephoniques
  • Patent number: 4354732
    Abstract: A transmission cable using optical fibre for conveying the information consists of fibres loosely laid in helical grooves of a core so that the fibre will undulate within the groove due to over-length given by pretwisting of the fibre and curvature of the groove flanks. Reduction of the contact surface between the fibre and the core improves the electrical characteristics and reduces the sensitivity of the cable to mechanical stress.
    Type: Grant
    Filed: March 7, 1979
    Date of Patent: October 19, 1982
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Maurice Arnaud, deceased, by Marie C. N. A. Avril nee Arnaud, heir, by Michel F. Arnaud, heir, Bernard Chiron, Claude Gallachi, Jean-Pierre Hulin, Michel de Vecchis
  • Patent number: 4272472
    Abstract: A process and tooling to carry on said process for producing direct from extrusion an open groove plastic cylindrical section which consists in extruding the material around cylindrical pins arranged along a circle and protruding downstream with respect with the die opening and drawing the deformable structure along inner cutters located in the ducts formed by the pins to cut the material between the duct and the outside and further drawing said still deformable structure around flexible wires free to fill said slitted ducts.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: June 9, 1981
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Jean P. Hulin, Michel de Vecchis
  • Patent number: 4265512
    Abstract: The electro-optic converter is designed to terminate optical fiber cables consisting of a mechanical core surrounded by a helically grooved sheath in which an optical fibre is loosely placed in the grooves. It consists of an hybrid circuit conversion matrix made of a substrate with a central bore cooperating with a bore in a standard multi-pin casing base for positioning the cable core; a star shaped conductive film on said substrate serves as a common electrode for the plurality of discrete opto-electronic devices also connected each to a different pin of the base and in centering and locking means for the cable.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: May 5, 1981
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Bernard Chiron, Jean-Louis Foure, Michel de Vecchis
  • Patent number: 4260991
    Abstract: A luneberg type passive reflector for circularly polarized waves consists of a woven cloth made partially of conductive wires located within the dielectric sphere the surface of which is covered with a set of parallel wires perpendicular with the conductive wires in said cloth. The conductive wires of the cloth are less than five hundredths of wavelength in diameter and their spacing is between 1/4 and 1/20 of a wavelength. The wires interwoven with said metal wires to form the cloth are preferably made of flax.
    Type: Grant
    Filed: July 24, 1979
    Date of Patent: April 7, 1981
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Francois Dachert, Jean Gelin, Raymond Ropars
  • Patent number: 4258328
    Abstract: A microwave wide band feed forward amplifier consists of modular amplifying units and modular delay units adjusted to compensate said modular amplifying unit, two said amplifying units constitute the main amplifier, another two the error signal amplifier and a single module amplifier is connected between the input and the error signal amplifier. Wide band compensation of the 3rd harmonic level is obtained at high level.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: March 24, 1981
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Julien Prevot, Jean-Claude Raux
  • Patent number: 4258339
    Abstract: The band widening circuit consists of a section of microstrip with adjustable characteristic impedance connected in series with an adjustable capacitor both connected to the three interleaved conductive pattern of the circulator. The preferred mode consists of a microstrip with air as dielectric and a conductive plate movable with respect to the conductive strip in the shape of a spiral. The capacitor is a conductive plunger movable in a conductively coated recess of a substrate for the conductive strip of the microstrip line section.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: March 24, 1981
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Nicolle Bernard, Jean-Rene Mahieu
  • Patent number: 4255727
    Abstract: In an electromechanical filter, poles are obtained by interconnecting an electrical reactance between the input and output of the filter. It is shown that this impedance behaves as a mechanical bridge.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: March 10, 1981
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Herbert Ernyei, Etienne Langlois
  • Patent number: 4237687
    Abstract: A head for laying optical fibres in a helically grooved cable core consists of a freely rotating mount assembly carrying fibre guides inclined on the axis of travel of the core with an angle smaller than 45.degree.. The fibre guides are elastic hollow tubes ended by a bevel maintained on the bottom of the associated groove. An optical control unit is provided for correct positioning of the mount when starting to lay.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: December 9, 1980
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Michel de Vecchis, Jean-Pierre Hulin
  • Patent number: 4236125
    Abstract: In a circulator using strip technology a high thermal conductivity through the piled up parts is obtained by use of heat conductive insulating grease layers between the parts which include a solid machined metal cap surrounding the gyromagnetic pellets and broad banding circuits between the ports and earthed contacts on the strip substrate, the capacitor of which uses said cap as an electrode. The outside of said cap is cylindrical, the inside hexagonal.
    Type: Grant
    Filed: July 9, 1979
    Date of Patent: November 25, 1980
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Nicolle Bernard, Gerard Forterre
  • Patent number: 4235009
    Abstract: Powdered plastic encapsulation of solid tantalum capacitors is achieved through coating the capacitors between 150.degree. C. and 250.degree. C. while biasing the capacitors at direct voltage between 0.2 and 1 times the rated voltage. The plastic is cured in about 3 minutes. The capacity temperature derating and the reverse current temperature derating are reduced with respect to capacitors encapsulated unbiased at the same temperature.
    Type: Grant
    Filed: April 6, 1978
    Date of Patent: November 25, 1980
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Balint Escher, Rene' Romanet
  • Patent number: 4221513
    Abstract: Continuous machining of grooves in a cylindrical dielectric rod is achieved by guiding the rod into a heating machining head incorporating a rotating cutter made from a chemically etched stainless steel sheet and guiding the rod downstream of said head. A chip removing head made of a rotating unit comprising channels in which said chips are aspired by decompression effect of a gas is mechanically coupled with and upstream of the machining head.
    Type: Grant
    Filed: January 3, 1979
    Date of Patent: September 9, 1980
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Gilles Dubois, Jean-Pierre Hulin, Michel de Vecchis
  • Patent number: 4186357
    Abstract: A stripline non-reciprocal multi-octave phase shifter which consists of a matched dielectric slab located along the first ferrite slab edge which corresponds to the magnetic wall and of lumped loads placed along the propagation direction along the same edge of the second ferrite slab. The other edge of the slabs are associated with identical composite media terminated by a lump impedance which consists of a short-circuit between the three conductors in the preferred embodiment of the invention. A high permittivity dielectric slab near the other edge of each of the ferrite slabs is preferably part of said composite media.
    Type: Grant
    Filed: March 9, 1978
    Date of Patent: January 29, 1980
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Gerard Forterre, Jean Marcoux
  • Patent number: 4181905
    Abstract: Quick release interconnection of waveguide circuits terminated at least partially by a standard flange is achieved by rotation of a clamping ring which surrounds the first circuit termination and cooperates by means of outer grips with a groove in a base mounted on the second circuit. Tight engagement is obtained by means of protruding pins carried by a sleeve fastened to the first circuit guided by semicircular cams and locked in a recess in inclined spring guides carried by the inner face of the rotatable ring. Disengagement is obtained by rotating the ring counterwise. Fool proof interconnection is obtained by a unique means protruding from the standard flange and registering with a unique recess in said base.
    Type: Grant
    Filed: June 23, 1978
    Date of Patent: January 1, 1980
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Andre Bouvard, Jean-Rene Mahieu
  • Patent number: 4169969
    Abstract: An apparatus comprising a stopband filter, a linear amplifier, a limiter circuit, a narrow band filter and a threshold circuit, insensitive to voice signals. When signalling signals are emitted with two frequencies, the apparatus comprises two channels each of them being protected by an input reject filter against one of the signalling frequencies.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: October 2, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Jacques Bessard, Robert Dallemagne, Claude Hannigsberg
  • Patent number: 4163641
    Abstract: An extrusion tool consisting of a stack of thin metal wafers in which apertures have been machined by chemical etching. Each wafer has one or several apertures. For simple profiles the wafers are identical. The apertures in adjacent wafers are angularly offset one with respect of the other for helical extrusion.
    Type: Grant
    Filed: June 26, 1978
    Date of Patent: August 7, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Jean-Pierre Hulin, Michel DE Vecchis
  • Patent number: 4163960
    Abstract: An electromechanical filter comprising resonators interconnected by couplers and at least one bridge strapping over several resonators in which said resonators are longitudinally vibrating, said couplers and bridge are bending and the number of strapped resonators is a multiple of four. Such a filter shows improved phase characteristic within the pass band.
    Type: Grant
    Filed: December 21, 1977
    Date of Patent: August 7, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Herbert Ernyei, Etienne Langlois
  • Patent number: 4155963
    Abstract: A cable comprising a central armour, a dielectric helically grooved core and optical fibres housed in said grooves which are formed with a lip protruding from one edge is produced by extrusion of the profiled core on the armour heating of the core, laying of one fibre within one groove with the aid of a fibre guide controlled by a positioning slot in said core, bending the lip to close the groove outwardly and repeating said heating, laying, etc. . . for each fibre and taping the structure.
    Type: Grant
    Filed: April 19, 1978
    Date of Patent: May 22, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Michel de Vecchis, Maurice Arnaud
  • Patent number: 4152677
    Abstract: In a surface wave isolator consisting of two gyromagnetic slabs a conductive strip between said slabs, means to establish a magnetizing field within said slabs, a two part load is associated side by side with said slabs and the strip extends also between the two parts of the load. A first part of the load is a continuous load parallel to the strip, a second part of the load is a plurality of localized absorbing means placed along the propagation axis and parallel to said strip. The impedance of the localized absorbing means is matched to the impedance of an unwanted parasitic propagation mode at the corresponding place.
    Type: Grant
    Filed: July 26, 1978
    Date of Patent: May 1, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Bernard Chiron, Gerard Forterre, Jean Marcoux
  • Patent number: 4146867
    Abstract: High precision film resistors are designed as a main resistive element corresponding to half the total value associated with five additional resistive elements the values of each of which are successively half of the value of the preceding one plus one resistive element of the same value as the smallest element of the five above mentioned elements, each of the additional element is originally short-circuited, adjustment being performed by cancelling at least one of the short circuits. This design of the resistive elements allows a reduced number of short circuit suppressions than previously used designs with the same precision.
    Type: Grant
    Filed: June 26, 1978
    Date of Patent: March 27, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Gerard Blangeard, Jacques Robineau
  • Patent number: 4144434
    Abstract: In a microwave cylindrical heating TM.sub.010 cavity for continuous heating of rods, wires, etc. . . focussing means are provided surrounding the entry and or the exit to locally concentrate the microwave energy on the object to be heated. Said means consists in 45.degree. annular wedge. As variants focussing is achieved by ferromagnetic annulus.
    Type: Grant
    Filed: June 14, 1976
    Date of Patent: March 13, 1979
    Assignee: Societe Lignes Telegraphiques et Telephoniques
    Inventors: Bernard Chiron, Michel DE Vecchis