Patents by Inventor Claude Gragnolati

Claude Gragnolati 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).

  • Low-frequency hydrophone and sonar array including such hydrophones
    Patent number: 5144597
    Abstract: A low-frequency hydrophone for a sonar array comprises at least a lacunary ceramics element with open porosity saturated by a viscous fluid, on which metal electrodes have been deposited. This hydrophone forms a high-pass filter whose cutoff frequency is adjusted by modulating the area of the electrodes. The present invention may find particular application in towed linear arrays and passive sonars.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: September 1, 1992
    Assignee: Thomson-CSF
    Inventors: Michel Lagier, Claude Gragnolati, Jena-Pierre Besombes
  • Geophone with a sensitive element made of piezoelectric polymer
    Patent number: 4839872
    Abstract: A geophone designed to measure the vibrations of bodies, especially vibrations in the earth's crust, comprises two-strip sensors made of piezoelectric polymer, embedded by one end in the geophone casing and resting freely, by one side, on the inertial mass of the geophone, thus enabling the making of geophones with a very wide pass-band.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: June 13, 1989
    Assignee: Thomson-CSF
    Inventors: Claude Gragnolati, Didier Thollon, Jean-Georges Malcor
  • Velocity hydrophone
    Patent number: 4547870
    Abstract: A directional velocity hydrophone is provided which does not appreciably disturb the particular movement of the fluid in which it is plunged and which comprises bending blades disposed in a ring and embedded in an inertial mass, which deliver an electric current substantially proportional to the particular speed of the fluid.
    Type: Grant
    Filed: January 24, 1984
    Date of Patent: October 15, 1985
    Assignee: Thomson-CSF
    Inventors: Charles Maerfeld, Michel Josserand, Claude Gragnolati