Patents by Inventor Jacques Lavergnat

Jacques Lavergnat 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).

  • Device for measuring the size of moving particles, in particular for pluviometric measurements
    Patent number: 6590650
    Abstract: The invention concerns a pluviometric device for measuring the diameter of individual raindrops (G) passing through a measuring volume (110), comprising optical transmission means (100), receiving means including at least a sensor receiving at least part of the light derived from at least one transmission means after it has passed through the measuring volume, and processing means (20, 30) which receive the signal at said sensor (120) output and which determine the individual diameter of raindrops. The invention is characterized in that the receiving means include at least two such sensors (124a, 124b) which receive portions of light derived from the transmitting means which are superposed along the general displacement direction of the particles and the processing means (20, 30) operate a correlative processing on the signals at the output of said sensors.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: July 8, 2003
    Assignee: Centre National de La Recherche Scientififque (CNRS)
    Inventors: Jean-Yves Delahaye, Jacques Lavergnat, Jean-Paul Vinson, Theodore Danguy
  • Frequency measurement method and device
    Patent number: 4670712
    Abstract: For measuring the frequency of a sine shaped signal accompanied by noise, for example Gaussian noise, in an input signal, that input signal is applied to two measuring arms, possibly after heterodyning. One arm includes a counter for counting the zero crossings of the signal. The other arm includes a derivator and a second counter for counting zero crossings. A processing circuit determines the frequency and the signal-to-noise ratio from the measurements.
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: June 2, 1987
    Assignee: Etat Francais
    Inventors: Jacques Lavergnat, Monique Dechambre
  • Device for determining and following the instantaneous coordinates of the extreme value of a curve
    Patent number: 4580227
    Abstract: The invention relates to a device for determining and following the instantaneous coordinates of the extreme value of a curve y=f(x), characteristic of a system having an input x and an output y.The device comprises a multiplier having two inputs and one output, a first differentiator, whose input is connected to the input x of the system and whose output is connected to one of the inputs of the multiplier, a second differentiator, whose input is connected to the output y of the system and whose output is connected to the other input of the multiplier, and an integrator, whose input is connected to the output of the multiplier and whose output is connected to the input x of the system.
    Type: Grant
    Filed: November 10, 1982
    Date of Patent: April 1, 1986
    Inventors: Jacques Lavergnat, Jean-Yves Delahaye