Patents by Inventor Pierre Hartemann

Pierre Hartemann 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).

  • 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
  • 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
  • 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
  • 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
  • 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