Search Patents
  • Volume magnetostatic wave device
    Patent number: 4392115
    Abstract: The volume magnetostatic wave device comprises a unidirectional-radiation transducer composed of equidistant microstrips connected to a polyphase transformer and coupled to a ferrimagnetic wafer which is subjected to a polarizing magnetic field.
    Type: Grant
    Filed: April 13, 1981
    Date of Patent: July 5, 1983
    Assignee: Thomson-CSF
    Inventors: Gerard Volluet, Pierre Hartemann
  • Tunable high-frequency devices
    Patent number: 5307068
    Abstract: A tunable high-frequency device using a superconductive thin layer with a thickness smaller than the thickness of penetration of a magnetic field is positioned on a dielectric layer. Also included is a means for varying the density of the Cooper pairs of the superconductive thin layer.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: April 26, 1994
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Magnetostatic wave magnetometer
    Patent number: 4341998
    Abstract: A unidirectional magnetometer comprising at least two magnetostatic wave oscillators with resonators or delay lines, made in two portions in a magnetic material layer respectively subject to the field to be measured and to given magnetic fields of the same direction, but of opposite sense and adjacent intensities.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: July 27, 1982
    Assignee: Thomson-CSF
    Inventors: Jean P. Castera, Pierre Hartemann
  • Refractive stigmatic system for elastic surface waves
    Patent number: 4193473
    Abstract: The present invention relates to refractive stigmatic systems designed to deflect or focus elastic surface waves which can propagate at the surface of a substrate. The object of the invention is a lens or prism comprising an array of elementary refractive zones formed by deposition or ion implantation and intended to produce uniform attenuation of refracted vibrational radiation.
    Type: Grant
    Filed: July 7, 1977
    Date of Patent: March 18, 1980
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Elastic surface wave oscillator
    Patent number: 4129837
    Abstract: The invention relates to elastic surface wave oscillators using a feedback loop formed by a filter consisting of two interdigitated comb transducers. More particularly, the invention relates to a stable oscillator having a low harmonic content wherein the electrical oscillation energy is extracted by means of an auxiliary interdigitated transducer receiving a fraction of the vibratory energy exchanged in the feedback loop.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: December 12, 1978
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Method of modifying the temperature drift of the propagation time of surface elastic waves and a device obtained by said method
    Patent number: 4110653
    Abstract: The present invention relates to the modification of the temperature-induced drift in propagation time of surface elastic waves. The invention proposes to achieve this modification by selecting a suitable crystal cut of the crystalline substrate, and carrying out a localized ion bombardment of the surface at which the elastic waves propagate.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: August 29, 1978
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Magnetostatic wave dioptric device
    Patent number: 4419637
    Abstract: A magnetostatic wave device in which waves propagate in a layer of magnetic material grown on a non-magnetic crystalline substrate with a grating arranged in the wave path for modifying propagation velocity. The grating is formed by ion implantation without removal of magnetic material so coupling with spin modes is avoided.
    Type: Grant
    Filed: January 28, 1982
    Date of Patent: December 6, 1983
    Assignee: Thomson-CSF
    Inventors: Gerard Volluet, Pierre Hartemann
  • Device for localized heating of biological tissues
    Patent number: 4586512
    Abstract: A device for therapeutic heating by hyperthermia comprises an emitter which focuses ultrasonic radiation into biological tissues and produces localized heating, especially for the treatment of tumors. The radiation emitter consists of a piezoelectric plate subdivided into annular radiating zones of equal width by a set of concentric circular grooves.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: May 6, 1986
    Assignee: Thomson-CSF
    Inventors: Jean-Paul Do-huu, Pierre Hartemann
  • Elastic surface wave accelerometer
    Patent number: 4301683
    Abstract: The invention relates to an accelerometer comprising at least one elastic plate propagating elastic surface waves, to which a normal force is applied resulting from the action of the acceleration which is to be measured on a solid or liquid body of predetermined mass. The measurement of the deviation in frequency of the oscillator of which the plate is a part gives an indication of the value of the normal component of the acceleration.
    Type: Grant
    Filed: November 27, 1979
    Date of Patent: November 24, 1981
    Assignee: Thomson-CSF
    Inventors: Pierre Hartemann, Jean-Paul Castera
  • Elastic surface wave accelerometers
    Patent number: 4515016
    Abstract: An elastic surface wave accelerometer having a deformable structure, fixed at one end and providing at its free end a seismic mass. The deformable structure may be an open frame with a single post or a closed frame with two posts. The accelerometer can measure movement of a missile or that of a gravitational field.
    Type: Grant
    Filed: June 17, 1983
    Date of Patent: May 7, 1985
    Assignee: Thomson-CSF
    Inventors: Pierre Hartemann, Paul-Louis Meunier, Alain Jacobelli
  • Surface wave programmable oscillator
    Patent number: 4023120
    Abstract: The present invention relates to surface elastic wave programmable oscillators. The oscillator in accordance with the invention comprises an amplifier and a feedback loop comprising a selective surface wave transmission system which offers N possibilities of energy exchange between a transducer array with curved teeth, and a set of auxiliary transducers arranged in a fantail fashion.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: May 10, 1977
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Surface wave electro-mechanical device
    Patent number: 4013983
    Abstract: The invention relates to elastic surface wave resonators and filters. The device in accordance with the invention is based mainly on the selective reflection of the elastic surface waves. It comprises a crystalline substrate in the upper face of which at least one grating of reflective elements is formed by ion implantation for locally altering the regular arrangement of the atoms in the lattice structure of the substrate.
    Type: Grant
    Filed: November 7, 1975
    Date of Patent: March 22, 1977
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Magnetostatic-wave device comprising a conducting strip exchange structure
    Patent number: 4314214
    Abstract: The invention relates to a magnetostatic-wave device whose ferrimagnetic layer supports an exchange structure formed by an array of conducting strips having their ends connected by conducting bridges. The invention applies particularly to the construction of magnetostatic-wave devices using couplers, hybrid junctions, reflecting mirrors, extraction structures and resonators.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: February 2, 1982
    Assignee: Thomson-CSF
    Inventors: Jean P. Castera, Pierre Hartemann, Jean M. Dupont
  • System for measuring the frequency of an electrical signal
    Patent number: 4034288
    Abstract: The present invention relates to system for measuring the frequency of an electrical signal. The device in accordance with the invention comprises, deposited upon a piezo-electric substrate a transducer array in the form of interdigital comb structures whose teeth are in the form of a circular arc and which are capable of emitting surface elastic waves at the surface of the substrate, and a series of pick-ups elements of substantially point type, arranged to selectively receive said surface elastic waves.
    Type: Grant
    Filed: June 13, 1975
    Date of Patent: July 5, 1977
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Device for the directive transmission of elastic surface waves and process for making the same
    Patent number: 3963997
    Abstract: The invention relates to the directive transmission of elastic surface waves. The object of the invention is a device comprising a crystalline substrate on whose surface elastic surfaces waves can be propagated. The value of surface-wave phase velocity can be changed by local modification of the crystalline lattice structure in a directive zone formed immediately below the surface. The structural modification of the lattice structure can be produced by ion implantation.
    Type: Grant
    Filed: October 25, 1974
    Date of Patent: June 15, 1976
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Method of fixing a ferrite to a metal piece
    Patent number: 4457464
    Abstract: In a method for fixing a ferrite to a metal piece such as a pole-piece of a magnetic polarizing circuit of a microwave device, a first step consists in depositing a nonresistive metal on the ferrite face to be fixed. A second step consists in applying a very thin layer of heat-conducting adhesive on the metallized ferrite face and bonding the ferrite to the metal piece, thus ensuring low thermal resistance, very low insertion loss and high power capability.
    Type: Grant
    Filed: January 7, 1982
    Date of Patent: July 3, 1984
    Assignee: Thomson-CSF
    Inventors: Gerard Forterre, Pierre Hartemann
  • Elastic surface wave accelerometer
    Patent number: 4199990
    Abstract: The invention relates to accelerometers comprising a vibrating elastic body associated with an electrical oscillator for maintaining its oscillations and a frequency measuring device for measuring its frequency. More particularly, the invention relates to an accelerometer in which the vibrations are in the form of elastic surface waves propagated along one face of a wafer of piezoelectric material cemented to a substrate. Measurement of the acceleration is based on the measurement of a frequency deviation or phase shift undergone by the elastic surface waves.
    Type: Grant
    Filed: June 27, 1978
    Date of Patent: April 29, 1980
    Assignee: Thomson-CSF
    Inventors: Michel Valdois, Patrick Levesque, Pierre Hartemann
  • Surface wave discriminator system
    Patent number: 3987367
    Abstract: The invention relates to surface wave discriminator systems comprising a substrate on the surface of which are arranged two electromechanical filters each incorporating two delay lines of dissimilar delay length. The amplitudes of the alternating voltages transmitted by said filters obey laws of variation as a function of the modulating quantity which take the form of sinusoidal half waves, offset by a quarter of a period, making it possible after differential detection to obtain a frequency or phase discrimination characteristic.
    Type: Grant
    Filed: August 20, 1974
    Date of Patent: October 19, 1976
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Pressure transducer with elastic surface waves and ignition system for internal combustion engine utilizing this transducer
    Patent number: 4326423
    Abstract: The invention relates to elastic surface wave pressure transducers. The invention has for its object a pressure transducer in which the plate is fixed by its periphery to a support having a central cavity in which a separating wall, forming an intermediate support, defines two chambers subject to the action of the pressures to be measured. The invention is more particularly applicable to the measurement of pressures and flow rates in the field of internal combustion engines.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: April 27, 1982
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
  • Process for compensating temperature variations in surface wave devices and pressure transducer utilizing this process
    Patent number: 4338575
    Abstract: An arrangement for temperature compensating transducers including two elastic surface wave oscillators whose frequencies are mixed to produce an output frequency that is a function of a parameter to be measured such as force, pressure or acceleration. A delay element such as a transmission line having a delay that is a function of temperature is inserted into the loop of at least one of the oscillators to balance oscillator frequency deviations resulting from temperature changes.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: July 6, 1982
    Assignee: Thomson-CSF
    Inventor: Pierre Hartemann
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